def bundle_min_distance(t, static, moving):
""" MDF-based pairwise distance optimization function (MIN)
We minimize the distance between moving streamlines as they align
with the static streamlines.
Parameters
-----------
t : ndarray
t is a vector of of affine transformation parameters with
size at least 6.
If size is 6, t is interpreted as translation + rotation.
If size is 7, t is interpreted as translation + rotation +
isotropic scaling.
If size is 12, t is interpreted as translation + rotation +
scaling + shearing.
static : list
Static streamlines
moving : list
Moving streamlines.
Returns
-------
cost: float
"""
aff = compose_matrix44(t)
moving = transform_streamlines(moving, aff)
d01 = distance_matrix_mdf(static, moving)
rows, cols = d01.shape
return 0.25 * (np.sum(np.min(d01, axis=0)) / float(cols) +
np.sum(np.min(d01, axis=1)) / float(rows)) ** 2
def bundle_sum_distance(t, static, moving, num_threads=None):
""" MDF distance optimization function (SUM)
We minimize the distance between moving streamlines as they align
with the static streamlines.
Parameters
-----------
t : ndarray
t is a vector of of affine transformation parameters with
size at least 6.
If size is 6, t is interpreted as translation + rotation.
If size is 7, t is interpreted as translation + rotation +
isotropic scaling.
If size is 12, t is interpreted as translation + rotation +
scaling + shearing.
static : list
Static streamlines
moving : list
Moving streamlines. These will be transform to align with
the static streamlines
Returns
-------
cost: float
"""
aff = compose_matrix44(t)
moving = transform_streamlines(moving, aff)
d01 = distance_matrix_mdf(static, moving)
return np.sum(d01)
def test_cascade_of_optimizations():
cingulum_bundles = two_cingulum_bundles()
cb1 = cingulum_bundles[0]
cb1 = set_number_of_points(cb1, 20)
test_x0 = np.array([10, 4, 3, 0, 20, 10, 1.5, 1.5, 1.5, 0., 0.2, 0])
cb2 = transform_streamlines(cingulum_bundles[0],
compose_matrix44(test_x0))
cb2 = set_number_of_points(cb2, 20)
print('first rigid')
slr = StreamlineLinearRegistration(x0=6)
slm = slr.optimize(cb1, cb2)
print('then similarity')
slr2 = StreamlineLinearRegistration(x0=7)
slm2 = slr2.optimize(cb1, cb2, slm.matrix)
print('then affine')
slr3 = StreamlineLinearRegistration(x0=12, options={'maxiter': 50})
slm3 = slr3.optimize(cb1, cb2, slm2.matrix)
assert_(slm2.fopt < slm.fopt)
assert_(slm3.fopt < slm2.fopt)
def test_rigid_real_bundles():
bundle_initial = fornix_streamlines()[:20]
bundle, shift = center_streamlines(bundle_initial)
mat = compose_matrix44([0, 0, 20, 45., 0, 0])
bundle2 = transform_streamlines(bundle, mat)
bundle_sum_distance = BundleSumDistanceMatrixMetric()
srr = StreamlineLinearRegistration(bundle_sum_distance,
x0=np.zeros(6),
method='Powell')
new_bundle2 = srr.optimize(bundle, bundle2).transform(bundle2)
evaluate_convergence(bundle, new_bundle2)
bundle_min_distance = BundleMinDistanceMatrixMetric()
srr = StreamlineLinearRegistration(bundle_min_distance,
x0=np.zeros(6),
method='Powell')
new_bundle2 = srr.optimize(bundle, bundle2).transform(bundle2)
evaluate_convergence(bundle, new_bundle2)
assert_raises(ValueError, StreamlineLinearRegistration, method='Whatever')
def test_stream_rigid():
static = fornix_streamlines()[:20]
moving = fornix_streamlines()[20:40]
static_center, shift = center_streamlines(static)
mat = compose_matrix44([0, 0, 0, 0, 40, 0])
moving = transform_streamlines(moving, mat)
srr = StreamlineLinearRegistration()
sr_params = srr.optimize(static, moving)
moved = transform_streamlines(moving, sr_params.matrix)
srr = StreamlineLinearRegistration(verbose=True)
srm = srr.optimize(static, moving)
moved2 = transform_streamlines(moving, srm.matrix)
moved3 = srm.transform(moving)
assert_array_almost_equal(moved[0], moved2[0], decimal=3)
assert_array_almost_equal(moved2[0], moved3[0], decimal=3)
def test_center_and_transform():
A = np.array([[1, 2, 3], [1, 2, 3.]])
streamlines = [A for i in range(10)]
streamlines2, center = center_streamlines(streamlines)
B = np.zeros((2, 3))
assert_array_equal(streamlines2[0], B)
assert_array_equal(center, A[0])
affine = np.eye(4)
affine[0, 0] = 2
affine[:3, -1] = - np.array([2, 1, 1]) * center
streamlines3 = transform_streamlines(streamlines, affine)
assert_array_equal(streamlines3[0], B)
def test_deform_streamlines():
# Create Random deformation field
deformation_field = np.random.randn(200, 200, 200, 3)
# Specify stream2grid and grid2world
stream2grid = np.array([[np.random.randn(1)[0], 0, 0, 0],
[0, np.random.randn(1)[0], 0, 0],
[0, 0, np.random.randn(1)[0], 0],
[0, 0, 0, 1]])
grid2world = np.array([[np.random.randn(1)[0], 0, 0, 0],
[0, np.random.randn(1)[0], 0, 0],
[0, 0, np.random.randn(1)[0], 0],
[0, 0, 0, 1]])
stream2world = np.dot(stream2grid, grid2world)
# Deform streamlines (let two grid spaces be the same for simplicity)
new_streamlines = deform_streamlines(streamlines,
deformation_field,
stream2grid,
grid2world,
stream2grid,
grid2world)
# Interpolate displacements onto original streamlines
streamlines_in_grid = transform_streamlines(streamlines, stream2grid)
disps = values_from_volume(deformation_field, streamlines_in_grid)
# Put new_streamlines into world space
new_streamlines_world = transform_streamlines(new_streamlines,
stream2world)
# Subtract disps from new_streamlines in world space
orig_streamlines_world = list(np.subtract(new_streamlines_world, disps))
# Put orig_streamlines_world into voxmm
orig_streamlines = transform_streamlines(orig_streamlines_world,
np.linalg.inv(stream2world))
# All close because of floating pt inprecision
for o, s in zip(orig_streamlines, streamlines):
assert_allclose(s, o, rtol=1e-10, atol=0)
def voxel2streamline(streamline, transformed=False, affine=None,
unique_idx=None):
"""
Maps voxels to streamlines and streamlines to voxels, for setting up
the LiFE equations matrix
Parameters
----------
streamline : list
A collection of streamlines, each n by 3, with n being the number of
nodes in the fiber.
affine : 4 by 4 array (optional)
Defines the spatial transformation from streamline to data.
Default: np.eye(4)
transformed : bool (optional)
Whether the streamlines have been already transformed (in which case
they don't need to be transformed in here).
unique_idx : array (optional).
The unique indices in the streamlines
Returns
-------
v2f, v2fn : tuple of arrays
The first array in the tuple answers the question: Given a voxel (from
the unique indices in this model), which fibers pass through it? Shape:
(n_voxels, n_fibers).
The second answers the question: Given a voxel, for each fiber, which
nodes are in that voxel? Shape: (n_voxels, max(n_nodes per fiber)).
"""
if transformed:
transformed_streamline = streamline
else:
if affine is None:
affine = np.eye(4)
transformed_streamline = transform_streamlines(streamline, affine)
if unique_idx is None:
all_coords = np.concatenate(transformed_streamline)
unique_idx = unique_rows(all_coords.astype(int))
else:
unique_idx = unique_idx
return _voxel2streamline(transformed_streamline, unique_idx)
def transform(self, moving):
""" Transform moving streamlines to the static.
Parameters
----------
moving : streamlines
Returns
-------
moved : streamlines
Notes
-----
All this does is apply ``self.matrix`` to the input streamlines.
"""
return transform_streamlines(moving, self.matrix)
def test_rigid_parallel_lines():
bundle_initial = simulated_bundle()
bundle, shift = center_streamlines(bundle_initial)
mat = compose_matrix44([20, 0, 10, 0, 40, 0])
bundle2 = transform_streamlines(bundle, mat)
bundle_sum_distance = BundleSumDistanceMatrixMetric()
options = {'maxcor': 100, 'ftol': 1e-9, 'gtol': 1e-16, 'eps': 1e-3}
srr = StreamlineLinearRegistration(metric=bundle_sum_distance,
x0=np.zeros(6),
method='L-BFGS-B',
bounds=None,
options=options)
new_bundle2 = srr.optimize(bundle, bundle2).transform(bundle2)
evaluate_convergence(bundle, new_bundle2)
def test_affine_real_bundles():
bundle_initial = fornix_streamlines()
bundle_initial, shift = center_streamlines(bundle_initial)
bundle = bundle_initial[:20]
xgold = [0, 4, 2, 0, 10, 10, 1.2, 1.1, 1., 0., 0.2, 0.]
mat = compose_matrix44(xgold)
bundle2 = transform_streamlines(bundle_initial[:20], mat)
x0 = np.array([0, 0, 0, 0, 0, 0, 1., 1., 1., 0, 0, 0])
x = 25
bounds = [(-x, x), (-x, x), (-x, x),
(-x, x), (-x, x), (-x, x),
(0.1, 1.5), (0.1, 1.5), (0.1, 1.5),
(-1, 1), (-1, 1), (-1, 1)]
options = {'maxcor': 10, 'ftol': 1e-7, 'gtol': 1e-5, 'eps': 1e-8}
metric = BundleMinDistanceMatrixMetric()
slr = StreamlineLinearRegistration(metric=metric,
x0=x0,
method='L-BFGS-B',
bounds=bounds,
verbose=True,
options=options)
slm = slr.optimize(bundle, bundle2)
new_bundle2 = slm.transform(bundle2)
slr2 = StreamlineLinearRegistration(metric=metric,
x0=x0,
method='Powell',
bounds=None,
verbose=True,
options=None)
slm2 = slr2.optimize(bundle, new_bundle2)
new_bundle2 = slm2.transform(new_bundle2)
evaluate_convergence(bundle, new_bundle2)
def test_rigid_partial_real_bundles():
static = fornix_streamlines()[:20]
moving = fornix_streamlines()[20:40]
static_center, shift = center_streamlines(static)
moving_center, shift2 = center_streamlines(moving)
print(shift2)
mat = compose_matrix(translate=np.array([0, 0, 0.]),
angles=np.deg2rad([40, 0, 0.]))
moved = transform_streamlines(moving_center, mat)
srr = StreamlineLinearRegistration()
srm = srr.optimize(static_center, moved)
print(srm.fopt)
print(srm.iterations)
print(srm.funcs)
moving_back = srm.transform(moved)
print(srm.matrix)
static_center = set_number_of_points(static_center, 100)
moving_center = set_number_of_points(moving_back, 100)
vol = np.zeros((100, 100, 100))
spts = np.concatenate(static_center, axis=0)
spts = np.round(spts).astype(np.int) + np.array([50, 50, 50])
mpts = np.concatenate(moving_center, axis=0)
mpts = np.round(mpts).astype(np.int) + np.array([50, 50, 50])
for index in spts:
i, j, k = index
vol[i, j, k] = 1
vol2 = np.zeros((100, 100, 100))
for index in mpts:
i, j, k = index
vol2[i, j, k] = 1
overlap = np.sum(np.logical_and(vol, vol2)) / float(np.sum(vol2))
assert_equal(overlap * 100 > 40, True)
def test_similarity_real_bundles():
bundle_initial = fornix_streamlines()
bundle_initial, shift = center_streamlines(bundle_initial)
bundle = bundle_initial[:20]
xgold = [0, 0, 10, 0, 0, 0, 1.5]
mat = compose_matrix44(xgold)
bundle2 = transform_streamlines(bundle_initial[:20], mat)
metric = BundleMinDistanceMatrixMetric()
x0 = np.array([0, 0, 0, 0, 0, 0, 1], 'f8')
slr = StreamlineLinearRegistration(metric=metric,
x0=x0,
method='Powell',
bounds=None,
verbose=False)
slm = slr.optimize(bundle, bundle2)
new_bundle2 = slm.transform(bundle2)
evaluate_convergence(bundle, new_bundle2)
def plot_bundles_with_metric(bundle_path,
endings_path,
brain_mask_path,
bundle,
metrics,
output_path,
tracking_format="trk_legacy",
show_color_bar=True):
import seaborn as sns # import in function to avoid error if not installed (this is only needed in this function)
from dipy.viz import actor, window
from tractseg.libs import vtk_utils
def _add_extra_point_to_last_streamline(sl):
# Coloring broken as soon as all streamlines have same number of points -> why???
# Add one number to last streamline to make it have a different number
sl[-1] = np.append(sl[-1], [sl[-1][-1]], axis=0)
return sl
# Settings
NR_SEGMENTS = 100
ANTI_INTERPOL_MULT = 1 # increase number of points to avoid interpolation to blur the colors
algorithm = "distance_map" # equal_dist | distance_map | cutting_plane
# colors = np.array(sns.color_palette("coolwarm", NR_SEGMENTS)) # colormap blue to red (does not fit to colorbar)
colors = np.array(sns.light_palette(
"red", NR_SEGMENTS)) # colormap only red, which fits to color_bar
img_size = (1000, 1000)
# Tractometry skips first and last element. Therefore we only have 98 instead of 100 elements.
# Here we duplicate the first and last element to get back to 100 elements
metrics = list(metrics)
metrics = np.array([metrics[0]] + metrics + [metrics[-1]])
metrics_max = metrics.max()
metrics_min = metrics.min()
if metrics_max == metrics_min:
metrics = np.zeros(len(metrics))
else:
metrics = img_utils.scale_to_range(
metrics,
range=(0, 99)) # range needs to be same as segments in colormap
orientation = dataset_specific_utils.get_optimal_orientation_for_bundle(
bundle)
# Load mask
beginnings_img = nib.load(endings_path)
beginnings = beginnings_img.get_data()
for i in range(1):
beginnings = binary_dilation(beginnings)
# Load trackings
if tracking_format == "trk_legacy":
streams, hdr = trackvis.read(bundle_path)
streamlines = [s[0] for s in streams]
else:
sl_file = nib.streamlines.load(bundle_path)
streamlines = sl_file.streamlines
streamlines = list(
transform_streamlines(streamlines,
np.linalg.inv(beginnings_img.affine)))
# Reduce streamline count
streamlines = streamlines[::2]
# Reorder to make all streamlines have same start region
streamlines = fiber_utils.add_to_each_streamline(streamlines, 0.5)
streamlines_new = []
for idx, sl in enumerate(streamlines):
startpoint = sl[0]
# Flip streamline if not in right order
if beginnings[int(startpoint[0]),
int(startpoint[1]),
int(startpoint[2])] == 0:
sl = sl[::-1, :]
streamlines_new.append(sl)
streamlines = fiber_utils.add_to_each_streamline(streamlines_new, -0.5)
if algorithm == "distance_map" or algorithm == "equal_dist":
streamlines = fiber_utils.resample_fibers(
streamlines, NR_SEGMENTS * ANTI_INTERPOL_MULT)
elif algorithm == "cutting_plane":
streamlines = fiber_utils.resample_to_same_distance(
streamlines,
max_nr_points=NR_SEGMENTS,
ANTI_INTERPOL_MULT=ANTI_INTERPOL_MULT)
# Cut start and end by percentage
# streamlines = FiberUtils.resample_fibers(streamlines, NR_SEGMENTS * ANTI_INTERPOL_MULT)
# remove = int((NR_SEGMENTS * ANTI_INTERPOL_MULT) * 0.15) # remove X% in beginning and end
# streamlines = np.array(streamlines)[:, remove:-remove, :]
# streamlines = list(streamlines)
if algorithm == "equal_dist":
segment_idxs = []
for i in range(len(streamlines)):
segment_idxs.append(list(range(NR_SEGMENTS * ANTI_INTERPOL_MULT)))
segment_idxs = np.array(segment_idxs)
elif algorithm == "distance_map":
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=100., metric=metric)
clusters = qb.cluster(streamlines)
centroids = Streamlines(clusters.centroids)
_, segment_idxs = cKDTree(centroids.data, 1,
copy_data=True).query(streamlines, k=1)
elif algorithm == "cutting_plane":
streamlines_resamp = fiber_utils.resample_fibers(
streamlines, NR_SEGMENTS * ANTI_INTERPOL_MULT)
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=100., metric=metric)
clusters = qb.cluster(streamlines_resamp)
centroid = Streamlines(clusters.centroids)[0]
# index of the middle cluster
middle_idx = int(NR_SEGMENTS / 2) * ANTI_INTERPOL_MULT
middle_point = centroid[middle_idx]
segment_idxs = fiber_utils.get_idxs_of_closest_points(
streamlines, middle_point)
# Align along the middle and assign indices
segment_idxs_eqlen = []
for idx, sl in enumerate(streamlines):
sl_middle_pos = segment_idxs[idx]
before_elems = sl_middle_pos
after_elems = len(sl) - sl_middle_pos
base_idx = 1000 # use higher index to avoid negative numbers for area below middle
r = range((base_idx - before_elems), (base_idx + after_elems))
segment_idxs_eqlen.append(r)
segment_idxs = segment_idxs_eqlen
# Add extra point otherwise coloring BUG
streamlines = _add_extra_point_to_last_streamline(streamlines)
renderer = window.Renderer()
colors_all = [] # final shape will be [nr_streamlines, nr_points, 3]
for jdx, sl in enumerate(streamlines):
colors_sl = []
for idx, p in enumerate(sl):
if idx >= len(segment_idxs[jdx]):
seg_idx = segment_idxs[jdx][idx - 1]
else:
seg_idx = segment_idxs[jdx][idx]
m = metrics[int(seg_idx / ANTI_INTERPOL_MULT)]
color = colors[int(m)]
colors_sl.append(color)
colors_all.append(
colors_sl
) # this can not be converted to numpy array because last element has one more elem
sl_actor = actor.streamtube(streamlines,
colors=colors_all,
linewidth=0.2,
opacity=1)
renderer.add(sl_actor)
# plot brain mask
mask = nib.load(brain_mask_path).get_data()
cont_actor = vtk_utils.contour_from_roi_smooth(mask,
affine=np.eye(4),
color=[.9, .9, .9],
opacity=.2,
smoothing=50)
renderer.add(cont_actor)
if show_color_bar:
lut_cmap = actor.colormap_lookup_table(scale_range=(metrics_min,
metrics_max),
hue_range=(0.0, 0.0),
saturation_range=(0.0, 1.0))
renderer.add(actor.scalar_bar(lut_cmap))
if orientation == "sagittal":
renderer.set_camera(position=(-242.14, 81.28, 113.61),
focal_point=(109.90, 93.18, 50.86),
view_up=(0.18, 0.00, 0.98))
elif orientation == "coronal":
renderer.set_camera(position=(66.82, 352.47, 132.99),
focal_point=(72.17, 89.31, 60.83),
view_up=(0.00, -0.26, 0.96))
elif orientation == "axial":
pass
else:
raise ValueError("Invalid orientation provided")
# Use this to interatively get new camera angle
# window.show(renderer, size=img_size, reset_camera=False)
# print(renderer.get_camera())
window.record(renderer, out_path=output_path, size=img_size)
affine = dix['affine']
"""
Store the cingulum bundle. A bundle is a list of streamlines.
"""
bundle = dix['cg.left']
"""
It happened that this bundle is in world coordinates and therefore we need to
transform it into native image coordinates so that it is in the same coordinate
space as the ``fa`` image.
"""
bundle_native = transform_streamlines(bundle, np.linalg.inv(affine))
"""
Show every streamline with an orientation color
===============================================
This is the default option when you are using ``line`` or ``streamtube``.
"""
renderer = window.Renderer()
stream_actor = actor.line(bundle_native)
renderer.set_camera(position=(-176.42, 118.52, 128.20),
focal_point=(113.30, 128.31, 76.56),
view_up=(0.18, 0.00, 0.98))
def warp_streamlines(sft, deformation_data, source='ants'):
""" Warp tractogram using a deformation map. Apply warp in-place.
Support Ants and Dipy deformation map.
Parameters
----------
streamlines: list or ArraySequence
Streamlines as loaded by the nibabel API (RASMM)
transfo: numpy.ndarray
Transformation matrix to bring streamlines from RASMM to Voxel space
deformation_data: numpy.ndarray
4D numpy array containing a 3D displacement vector in each voxel
source: str
Source of the deformation map [ants, dipy]
"""
sft.to_rasmm()
sft.to_center()
streamlines = sft.streamlines
transfo = sft.affine
if source == 'ants':
flip = [-1, -1, 1]
elif source == 'dipy':
flip = [1, 1, 1]
# Because of duplication, an iteration over chunks of points is necessary
# for a big dataset (especially if not compressed)
streamlines = ArraySequence(streamlines)
nb_points = len(streamlines._data)
cur_position = 0
chunk_size = 1000000
nb_iteration = int(np.ceil(nb_points / chunk_size))
inv_transfo = np.linalg.inv(transfo)
while nb_iteration > 0:
max_position = min(cur_position + chunk_size, nb_points)
points = streamlines._data[cur_position:max_position]
# To access the deformation information, we need to go in voxel space
# No need for corner shift since we are doing interpolation
cur_points_vox = np.array(transform_streamlines(points, inv_transfo)).T
x_def = map_coordinates(deformation_data[..., 0],
cur_points_vox.tolist(),
order=1)
y_def = map_coordinates(deformation_data[..., 1],
cur_points_vox.tolist(),
order=1)
z_def = map_coordinates(deformation_data[..., 2],
cur_points_vox.tolist(),
order=1)
# ITK is in LPS and nibabel is in RAS, a flip is necessary for ANTs
final_points = np.array(
[flip[0] * x_def, flip[1] * y_def, flip[2] * z_def])
# The Ants deformation is relative to world space
if source == 'ants':
final_points += np.array(points).T
# Dipy transformation is relative to vox space
elif source == 'dipy':
final_points += cur_points_vox
transform_streamlines(final_points, transfo, in_place=True)
streamlines._data[cur_position:max_position] = final_points.T
cur_position = max_position
nb_iteration -= 1
return streamlines
def setup(self, streamline, affine, evals=[0.001, 0, 0], sphere=None):
"""
Set up the necessary components for the LiFE model: the matrix of
fiber-contributions to the DWI signal, and the coordinates of voxels
for which the equations will be solved
Parameters
----------
streamline : list
Streamlines, each is an array of shape (n, 3)
affine : 4 by 4 array
Mapping from the streamline coordinates to the data
evals : list (3 items, optional)
The eigenvalues of the canonical tensor used as a response
function. Default:[0.001, 0, 0].
sphere: `dipy.core.Sphere` instance.
Whether to approximate (and cache) the signal on a discrete
sphere. This may confer a significant speed-up in setting up the
problem, but is not as accurate. If `False`, we use the exact
gradients along the streamlines to calculate the matrix, instead of
an approximation. Defaults to use the 724-vertex symmetric sphere
from :mod:`dipy.data`
"""
if sphere is not False:
SignalMaker = LifeSignalMaker(self.gtab,
evals=evals,
sphere=sphere)
if affine is None:
affine = np.eye(4)
streamline = transform_streamlines(streamline, affine)
# Assign some local variables, for shorthand:
all_coords = np.concatenate(streamline)
vox_coords = unique_rows(np.round(all_coords).astype(np.intp))
del all_coords
# We only consider the diffusion-weighted signals:
n_bvecs = self.gtab.bvals[~self.gtab.b0s_mask].shape[0]
v2f, v2fn = voxel2streamline(streamline, transformed=True,
affine=affine, unique_idx=vox_coords)
# How many fibers in each voxel (this will determine how many
# components are in the matrix):
n_unique_f = len(np.hstack(v2f.values()))
# Preallocate these, which will be used to generate the sparse
# matrix:
f_matrix_sig = np.zeros(n_unique_f * n_bvecs, dtype=np.float)
f_matrix_row = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
f_matrix_col = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
fiber_signal = []
for s_idx, s in enumerate(streamline):
if sphere is not False:
fiber_signal.append(SignalMaker.streamline_signal(s))
else:
fiber_signal.append(streamline_signal(s, self.gtab, evals))
del streamline
if sphere is not False:
del SignalMaker
keep_ct = 0
range_bvecs = np.arange(n_bvecs).astype(int)
# In each voxel:
for v_idx in range(vox_coords.shape[0]):
mat_row_idx = (range_bvecs + v_idx * n_bvecs).astype(np.intp)
# For each fiber in that voxel:
for f_idx in v2f[v_idx]:
# For each fiber-voxel combination, store the row/column
# indices in the pre-allocated linear arrays
f_matrix_row[keep_ct:keep_ct+n_bvecs] = mat_row_idx
f_matrix_col[keep_ct:keep_ct+n_bvecs] = f_idx
vox_fiber_sig = np.zeros(n_bvecs)
for node_idx in v2fn[f_idx][v_idx]:
# Sum the signal from each node of the fiber in that voxel:
vox_fiber_sig += fiber_signal[f_idx][node_idx]
# And add the summed thing into the corresponding rows:
f_matrix_sig[keep_ct:keep_ct+n_bvecs] += vox_fiber_sig
keep_ct = keep_ct + n_bvecs
del v2f, v2fn
# Allocate the sparse matrix, using the more memory-efficient 'csr'
# format:
life_matrix = sps.csr_matrix((f_matrix_sig,
[f_matrix_row, f_matrix_col]))
return life_matrix, vox_coords
def test_bundle_maps():
scene = window.Scene()
bundle = fornix_streamlines()
bundle, _ = center_streamlines(bundle)
mat = np.array([[1, 0, 0, 100],
[0, 1, 0, 100],
[0, 0, 1, 100],
[0, 0, 0, 1.]])
bundle = transform_streamlines(bundle, mat)
# metric = np.random.rand(*(200, 200, 200))
metric = 100 * np.ones((200, 200, 200))
# add lower values
metric[100, :, :] = 100 * 0.5
# create a nice orange-red colormap
lut = actor.colormap_lookup_table(scale_range=(0., 100.),
hue_range=(0., 0.1),
saturation_range=(1, 1),
value_range=(1., 1))
line = actor.line(bundle, metric, linewidth=0.1, lookup_colormap=lut)
scene.add(line)
scene.add(actor.scalar_bar(lut, ' '))
report = window.analyze_scene(scene)
npt.assert_almost_equal(report.actors, 1)
# window.show(scene)
scene.clear()
nb_points = np.sum([len(b) for b in bundle])
values = 100 * np.random.rand(nb_points)
# values[:nb_points/2] = 0
line = actor.streamtube(bundle, values, linewidth=0.1, lookup_colormap=lut)
scene.add(line)
# window.show(scene)
report = window.analyze_scene(scene)
npt.assert_equal(report.actors_classnames[0], 'vtkLODActor')
scene.clear()
colors = np.random.rand(nb_points, 3)
# values[:nb_points/2] = 0
line = actor.line(bundle, colors, linewidth=2)
scene.add(line)
# window.show(scene)
report = window.analyze_scene(scene)
npt.assert_equal(report.actors_classnames[0], 'vtkLODActor')
# window.show(scene)
arr = window.snapshot(scene)
report2 = window.analyze_snapshot(arr)
npt.assert_equal(report2.objects, 1)
# try other input options for colors
scene.clear()
actor.line(bundle, (1., 0.5, 0))
actor.line(bundle, np.arange(len(bundle)))
actor.line(bundle)
colors = [np.random.rand(*b.shape) for b in bundle]
actor.line(bundle, colors=colors)
With our current design it is easy to decide in which space you want the
streamlines and slices to appear. The default we have here is to appear in
world coordinates (RAS 1mm).
"""
world_coords = True
"""
If we want to see the objects in native space we need to make sure that all
objects which are currently in world coordinates are transformed back to
native space using the inverse of the affine.
"""
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(affine))
"""
Now we create, a ``Renderer`` object and add the streamlines using the ``line``
function and an image plane using the ``slice`` function.
"""
ren = window.Renderer()
stream_actor = actor.line(streamlines)
if not world_coords:
image_actor = actor.slicer(data, affine=np.eye(4))
else:
image_actor = actor.slicer(data, affine)
"""
def direct_streamline_norm(streams,
fa_path,
ap_path,
dir_path,
track_type,
conn_model,
subnet,
node_radius,
dens_thresh,
ID,
roi,
min_span_tree,
disp_filt,
parc,
prune,
atlas,
labels_im_file,
parcellation,
labels,
coords,
norm,
binary,
atlas_t1w,
basedir_path,
curv_thr_list,
step_list,
traversal,
min_length,
t1w_brain,
run_dsn=False):
"""
A Function to perform normalization of streamlines tracked in native
diffusion space to an MNI-space template.
Parameters
----------
streams : str
File path to save streamline array sequence in .trk format.
fa_path : str
File path to FA Nifti1Image.
ap_path : str
File path to the anisotropic power Nifti1Image.
dir_path : str
Path to directory containing subject derivative data for a given
pynets run.
track_type : str
Tracking algorithm used (e.g. 'local' or 'particle').
conn_model : str
Connectivity reconstruction method (e.g. 'csa', 'tensor', 'csd').
subnet : str
Resting-state subnet based on Yeo-7 and Yeo-17 naming (e.g. 'Default')
used to filter nodes in the study of brain subgraphs.
node_radius : int
Spherical centroid node size in the case that coordinate-based
centroids are used as ROI's for tracking.
dens_thresh : bool
Indicates whether a target graph density is to be used as the basis for
thresholding.
ID : str
A subject id or other unique identifier.
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
min_span_tree : bool
Indicates whether local thresholding from the Minimum Spanning Tree
should be used.
disp_filt : bool
Indicates whether local thresholding using a disparity filter and
'backbone subnet' should be used.
parc : bool
Indicates whether to use parcels instead of coordinates as ROI nodes.
prune : bool
Indicates whether to prune final graph of disconnected nodes/isolates.
atlas : str
Name of atlas parcellation used.
labels_im_file : str
File path to atlas parcellation Nifti1Image aligned to dwi space.
parcellation : str
File path to atlas parcellation Nifti1Image in MNI template space.
labels : list
List of string labels corresponding to graph nodes.
coords : list
List of (x, y, z) tuples corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
norm : int
Indicates method of normalizing resulting graph.
binary : bool
Indicates whether to binarize resulting graph edges to form an
unweighted graph.
atlas_t1w : str
File path to atlas parcellation Nifti1Image in T1w-conformed space.
basedir_path : str
Path to directory to output direct-streamline normalized temp files
and outputs.
curv_thr_list : list
List of integer curvature thresholds used to perform ensemble tracking.
step_list : list
List of float step-sizes used to perform ensemble tracking.
traversal : str
The statistical approach to tracking. Options are: det (deterministic),
closest (clos), boot (bootstrapped), and prob (probabilistic).
min_length : int
Minimum fiber length threshold in mm to restrict tracking.
t1w_brain : str
File path to the T1w Nifti1Image.
Returns
-------
streams_warp : str
File path to normalized streamline array sequence in .trk format.
dir_path : str
Path to directory containing subject derivative data for a given
pynets run.
track_type : str
Tracking algorithm used (e.g. 'local' or 'particle').
conn_model : str
Connectivity reconstruction method (e.g. 'csa', 'tensor', 'csd').
subnet : str
Resting-state subnet based on Yeo-7 and Yeo-17 naming (e.g. 'Default')
used to filter nodes in the study of brain subgraphs.
node_radius : int
Spherical centroid node size in the case that coordinate-based
centroids are used as ROI's for tracking.
dens_thresh : bool
Indicates whether a target graph density is to be used as the basis for
thresholding.
ID : str
A subject id or other unique identifier.
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
min_span_tree : bool
Indicates whether local thresholding from the Minimum Spanning Tree
should be used.
disp_filt : bool
Indicates whether local thresholding using a disparity filter and
'backbone subnet' should be used.
parc : bool
Indicates whether to use parcels instead of coordinates as ROI nodes.
prune : bool
Indicates whether to prune final graph of disconnected nodes/isolates.
atlas : str
Name of atlas parcellation used.
parcellation : str
File path to atlas parcellation Nifti1Image in MNI template space.
labels : list
List of string labels corresponding to graph nodes.
coords : list
List of (x, y, z) tuples corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
norm : int
Indicates method of normalizing resulting graph.
binary : bool
Indicates whether to binarize resulting graph edges to form an
unweighted graph.
atlas_for_streams : str
File path to atlas parcellation Nifti1Image in the same
morphological space as the streamlines.
traversal : str
The statistical approach to tracking. Options are: det
(deterministic), closest (clos), boot (bootstrapped),
and prob (probabilistic).
warped_fa : str
File path to MNI-space warped FA Nifti1Image.
min_length : int
Minimum fiber length threshold in mm to restrict tracking.
References
----------
.. [1] Greene, C., Cieslak, M., & Grafton, S. T. (2017). Effect of
different spatial normalization approaches on tractography and structural
brain subnets. subnet Neuroscience, 1-19.
"""
import gc
from dipy.tracking.streamline import transform_streamlines
from pynets.registration import utils as regutils
from pynets.plotting.brain import show_template_bundles
import os.path as op
from dipy.io.streamline import load_tractogram
from dipy.tracking._utils import _mapping_to_voxel
from dipy.tracking.utils import density_map
from dipy.io.stateful_tractogram import Space, StatefulTractogram, Origin
from dipy.io.streamline import save_tractogram
if run_dsn is True:
dsn_dir = f"{basedir_path}/dmri_reg/DSN"
if not op.isdir(dsn_dir):
os.mkdir(dsn_dir)
namer_dir = f"{dir_path}/tractography"
if not op.isdir(namer_dir):
os.mkdir(namer_dir)
atlas_img = nib.load(labels_im_file)
# Run SyN and normalize streamlines
fa_img = nib.load(fa_path)
atlas_t1w_img = nib.load(atlas_t1w)
t1w_brain_img = nib.load(t1w_brain)
brain_mask = np.asarray(t1w_brain_img.dataobj).astype("bool")
streams_t1w = "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s" % (
namer_dir,
"/streamlines_t1w_",
"%s" % (subnet + "_" if subnet is not None else ""),
"%s" %
(op.basename(roi).split(".")[0] + "_" if roi is not None else ""),
conn_model,
"%s" % ("%s%s" % ("_" + str(node_radius), "mm_") if
((node_radius != "parc") and
(node_radius is not None)) else "_"),
"curv",
str(curv_thr_list).replace(", ", "_"),
"step",
str(step_list).replace(", ", "_"),
"tracktype-",
track_type,
"_traversal-",
traversal,
"_minlength-",
min_length,
".trk",
)
density_t1w = "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s" % (
namer_dir,
"/density_map_t1w_",
"%s" % (subnet + "_" if subnet is not None else ""),
"%s" %
(op.basename(roi).split(".")[0] + "_" if roi is not None else ""),
conn_model,
"%s" % ("%s%s" % ("_" + str(node_radius), "mm_") if
((node_radius != "parc") and
(node_radius is not None)) else "_"),
"curv",
str(curv_thr_list).replace(", ", "_"),
"step",
str(step_list).replace(", ", "_"),
"tracktype-",
track_type,
"_traversal-",
traversal,
"_minlength-",
min_length,
".nii.gz",
)
streams_warp_png = '/tmp/dsn.png'
# SyN FA->Template
[mapping, affine_map,
warped_fa] = regutils.wm_syn(t1w_brain, ap_path, dsn_dir)
tractogram = load_tractogram(
streams,
fa_img,
to_origin=Origin.NIFTI,
to_space=Space.VOXMM,
bbox_valid_check=False,
)
fa_img.uncache()
streamlines = tractogram.streamlines
warped_fa_img = nib.load(warped_fa)
warped_fa_affine = warped_fa_img.affine
warped_fa_shape = warped_fa_img.shape
streams_in_curr_grid = transform_streamlines(streamlines,
affine_map.affine_inv)
streams_final_filt = regutils.warp_streamlines(t1w_brain_img.affine,
fa_img.affine, mapping,
warped_fa_img,
streams_in_curr_grid,
brain_mask)
# Remove streamlines with negative voxel indices
lin_T, offset = _mapping_to_voxel(np.eye(4))
streams_final_filt_final = []
for sl in streams_final_filt:
inds = np.dot(sl, lin_T)
inds += offset
if not inds.min().round(decimals=6) < 0:
streams_final_filt_final.append(sl)
# Save streamlines
stf = StatefulTractogram(
streams_final_filt_final,
reference=t1w_brain_img,
space=Space.VOXMM,
origin=Origin.NIFTI,
)
stf.remove_invalid_streamlines()
streams_final_filt_final = stf.streamlines
save_tractogram(stf, streams_t1w, bbox_valid_check=True)
warped_fa_img.uncache()
# DSN QC plotting
show_template_bundles(streams_final_filt_final, atlas_t1w,
streams_warp_png)
nib.save(
nib.Nifti1Image(
density_map(streams_final_filt_final,
affine=np.eye(4),
vol_dims=warped_fa_shape),
warped_fa_affine,
),
density_t1w,
)
del (
tractogram,
streamlines,
stf,
streams_final_filt_final,
streams_final_filt,
streams_in_curr_grid,
brain_mask,
)
gc.collect()
assert len(coords) == len(labels)
atlas_for_streams = atlas_t1w
else:
print(
"Skipping Direct Streamline Normalization (DSN). Will proceed to "
"define fiber connectivity in native diffusion space...")
streams_t1w = streams
warped_fa = fa_path
atlas_for_streams = labels_im_file
return (streams_t1w, dir_path, track_type, conn_model, subnet, node_radius,
dens_thresh, ID, roi, min_span_tree, disp_filt, parc, prune, atlas,
parcellation, labels, coords, norm, binary, atlas_for_streams,
traversal, warped_fa, min_length)
def track(peaks,
seed_image,
max_nr_fibers=2000,
smooth=None,
compress=0.1,
bundle_mask=None,
start_mask=None,
end_mask=None,
tracking_uncertainties=None,
dilation=0,
next_step_displacement_std=0.15,
nr_cpus=-1,
verbose=True):
"""
Generate streamlines.
Great speedup was archived by:
- only seeding in bundle_mask instead of entire image (seeding took very long)
- calculating fiber length on the fly instead of using extra function which has to iterate over entire fiber a
second time
"""
peaks[:, :, :, 0] *= -1 # how to flip along x axis to work properly
# Add +1 dilation for start and end mask to be more robust
start_mask = binary_dilation(start_mask,
iterations=dilation + 1).astype(np.uint8)
end_mask = binary_dilation(end_mask,
iterations=dilation + 1).astype(np.uint8)
if dilation > 0:
bundle_mask = binary_dilation(bundle_mask,
iterations=dilation).astype(np.uint8)
if tracking_uncertainties is not None:
tracking_uncertainties = img_utils.scale_to_range(
tracking_uncertainties, range=(0, 1))
global _PEAKS
_PEAKS = peaks
global _BUNDLE_MASK
_BUNDLE_MASK = bundle_mask
global _START_MASK
_START_MASK = start_mask
global _END_MASK
_END_MASK = end_mask
global _TRACKING_UNCERTAINTIES
_TRACKING_UNCERTAINTIES = tracking_uncertainties
# Get list of coordinates of each voxel in mask to seed from those
mask_coords = np.array(np.where(bundle_mask == 1)).transpose()
spacing = seed_image.header.get_zooms()[0]
max_nr_seeds = 100 * max_nr_fibers # after how many seeds to abort (to avoid endless runtime)
# How many seeds to process in each pool.map iteration
seeds_per_batch = 5000
if nr_cpus == -1:
nr_processes = psutil.cpu_count()
else:
nr_processes = nr_cpus
streamlines = []
fiber_ctr = 0
seed_ctr = 0
# Processing seeds in batches so we can stop after we reached desired nr of streamlines. Not ideal. Could be
# optimised by more multiprocessing fanciness.
while fiber_ctr < max_nr_fibers:
pool = multiprocessing.Pool(processes=nr_processes)
streamlines_tmp = pool.map(
partial(process_seedpoint,
next_step_displacement_std=next_step_displacement_std,
spacing=spacing),
seed_generator(mask_coords, seeds_per_batch))
# streamlines_tmp = [process_seedpoint(seed, spacing=spacing) for seed in
# seed_generator(mask_coords, seeds_per_batch)] # single threaded for debugging
pool.close()
pool.join()
streamlines_tmp = [sl for sl in streamlines_tmp
if len(sl) > 0] # filter empty ones
streamlines += streamlines_tmp
fiber_ctr = len(streamlines)
if verbose:
print("nr_fibs: {}".format(fiber_ctr))
seed_ctr += seeds_per_batch
if seed_ctr > max_nr_seeds:
if verbose:
print("Early stopping because max nr of seeds reached.")
break
if verbose:
print("final nr streamlines: {}".format(len(streamlines)))
streamlines = streamlines[:
max_nr_fibers] # remove surplus of fibers (comes from multiprocessing)
streamlines = Streamlines(streamlines) # Generate streamlines object
# Move from convention "0mm is in voxel corner" to convention "0mm is in voxel center". Most toolkits use the
# convention "0mm is in voxel center".
streamlines = fiber_utils.add_to_each_streamline(streamlines, -0.5)
# move streamlines to coordinate space
# This is doing: streamlines(coordinate_space) = affine * streamlines(voxel_space)
streamlines = list(transform_streamlines(streamlines, seed_image.affine))
# Smoothing does not change overall results at all because is just little smoothing. Just removes small unevenness.
if smooth:
streamlines = fiber_utils.smooth_streamlines(streamlines,
smoothing_factor=smooth)
if compress:
streamlines = fiber_utils.compress_streamlines(streamlines,
error_threshold=0.1,
nr_cpus=nr_cpus)
return streamlines
def setup(self, streamline, affine, evals=[0.001, 0, 0], sphere=None):
"""
Set up the necessary components for the LiFE model: the matrix of
fiber-contributions to the DWI signal, and the coordinates of voxels
for which the equations will be solved
Parameters
----------
streamline : list
Streamlines, each is an array of shape (n, 3)
affine : 4 by 4 array
Mapping from the streamline coordinates to the data
evals : list (3 items, optional)
The eigenvalues of the canonical tensor used as a response
function. Default:[0.001, 0, 0].
sphere: `dipy.core.Sphere` instance.
Whether to approximate (and cache) the signal on a discrete
sphere. This may confer a significant speed-up in setting up the
problem, but is not as accurate. If `False`, we use the exact
gradients along the streamlines to calculate the matrix, instead of
an approximation. Defaults to use the 724-vertex symmetric sphere
from :mod:`dipy.data`
"""
if sphere is not False:
SignalMaker = LifeSignalMaker(self.gtab,
evals=evals,
sphere=sphere)
if affine is None:
affine = np.eye(4)
streamline = transform_streamlines(streamline, affine)
# Assign some local variables, for shorthand:
all_coords = np.concatenate(streamline)
vox_coords = unique_rows(np.round(all_coords).astype(np.intp))
del all_coords
# We only consider the diffusion-weighted signals:
n_bvecs = self.gtab.bvals[~self.gtab.b0s_mask].shape[0]
v2f, v2fn = voxel2streamline(streamline,
transformed=True,
affine=affine,
unique_idx=vox_coords)
# How many fibers in each voxel (this will determine how many
# components are in the matrix):
n_unique_f = len(np.hstack(v2f.values()))
# Preallocate these, which will be used to generate the sparse
# matrix:
f_matrix_sig = np.zeros(n_unique_f * n_bvecs, dtype=np.float)
f_matrix_row = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
f_matrix_col = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
fiber_signal = []
for s_idx, s in enumerate(streamline):
if sphere is not False:
fiber_signal.append(SignalMaker.streamline_signal(s))
else:
fiber_signal.append(streamline_signal(s, self.gtab, evals))
del streamline
if sphere is not False:
del SignalMaker
keep_ct = 0
range_bvecs = np.arange(n_bvecs).astype(int)
# In each voxel:
for v_idx in range(vox_coords.shape[0]):
mat_row_idx = (range_bvecs + v_idx * n_bvecs).astype(np.intp)
# For each fiber in that voxel:
for f_idx in v2f[v_idx]:
# For each fiber-voxel combination, store the row/column
# indices in the pre-allocated linear arrays
f_matrix_row[keep_ct:keep_ct + n_bvecs] = mat_row_idx
f_matrix_col[keep_ct:keep_ct + n_bvecs] = f_idx
vox_fiber_sig = np.zeros(n_bvecs)
for node_idx in v2fn[f_idx][v_idx]:
# Sum the signal from each node of the fiber in that voxel:
vox_fiber_sig += fiber_signal[f_idx][node_idx]
# And add the summed thing into the corresponding rows:
f_matrix_sig[keep_ct:keep_ct + n_bvecs] += vox_fiber_sig
keep_ct = keep_ct + n_bvecs
del v2f, v2fn
# Allocate the sparse matrix, using the more memory-efficient 'csr'
# format:
life_matrix = sps.csr_matrix(
(f_matrix_sig, [f_matrix_row, f_matrix_col]))
return life_matrix, vox_coords
def transform_warp_sft(sft,
linear_transfo,
target,
inverse=False,
reverse_op=False,
deformation_data=None,
remove_invalid=True,
cut_invalid=False):
""" Transform tractogram using a affine Subsequently apply a warp from
antsRegistration (optional).
Remove/Cut invalid streamlines to preserve sft validity.
Parameters
----------
sft: StatefulTractogram
Stateful tractogram object containing the streamlines to transform.
linear_transfo: numpy.ndarray
Linear transformation matrix to apply to the tractogram.
target: Nifti filepath, image object, header
Final reference for the tractogram after registration.
inverse: boolean
Apply the inverse linear transformation.
reverse_op: boolean
Apply both transformation in the reverse order
deformation_data: np.ndarray
4D array containing a 3D displacement vector in each voxel.
remove_invalid: boolean
Remove the streamlines landing out of the bounding box.
cut_invalid: boolean
Cut invalid streamlines rather than removing them. Keep the longest
segment only.
Return
----------
new_sft : StatefulTractogram
"""
sft.to_rasmm()
sft.to_center()
if len(sft.streamlines) == 0:
return StatefulTractogram(sft.streamlines, target, Space.RASMM)
if inverse:
linear_transfo = np.linalg.inv(linear_transfo)
if not reverse_op:
streamlines = transform_streamlines(sft.streamlines, linear_transfo)
else:
streamlines = sft.streamlines
if deformation_data is not None:
if not reverse_op:
affine, _, _, _ = get_reference_info(target)
else:
affine = sft.affine
# Because of duplication, an iteration over chunks of points is
# necessary for a big dataset (especially if not compressed)
streamlines = ArraySequence(streamlines)
nb_points = len(streamlines._data)
cur_position = 0
chunk_size = 1000000
nb_iteration = int(np.ceil(nb_points / chunk_size))
inv_affine = np.linalg.inv(affine)
while nb_iteration > 0:
max_position = min(cur_position + chunk_size, nb_points)
points = streamlines._data[cur_position:max_position]
# To access the deformation information, we need to go in VOX space
# No need for corner shift since we are doing interpolation
cur_points_vox = np.array(transform_streamlines(
points, inv_affine)).T
x_def = map_coordinates(deformation_data[..., 0],
cur_points_vox.tolist(),
order=1)
y_def = map_coordinates(deformation_data[..., 1],
cur_points_vox.tolist(),
order=1)
z_def = map_coordinates(deformation_data[..., 2],
cur_points_vox.tolist(),
order=1)
# ITK is in LPS and nibabel is in RAS, a flip is necessary for ANTs
final_points = np.array([-1 * x_def, -1 * y_def, z_def])
final_points += np.array(points).T
streamlines._data[cur_position:max_position] = final_points.T
cur_position = max_position
nb_iteration -= 1
if reverse_op:
streamlines = transform_streamlines(streamlines, linear_transfo)
new_sft = StatefulTractogram(streamlines,
target,
Space.RASMM,
data_per_point=sft.data_per_point,
data_per_streamline=sft.data_per_streamline)
if cut_invalid:
new_sft, _ = cut_invalid_streamlines(new_sft)
elif remove_invalid:
new_sft.remove_invalid_streamlines()
return new_sft
affine = dix["affine"] """ Store the cingulum bundle. A bundle is a list of streamlines. """ bundle = dix["cg.left"] """ It happened that this bundle is in world coordinates and therefore we need to transform it into native image coordinates so that it is in the same coordinate space as the ``fa`` image. """ bundle_native = transform_streamlines(bundle, np.linalg.inv(affine)) """ Show every streamline with an orientation color =============================================== This is the default option when you are using ``line`` or ``streamtube``. """ renderer = window.Renderer() stream_actor = actor.line(bundle_native) renderer.set_camera(position=(-176.42, 118.52, 128.20), focal_point=(113.30, 128.31, 76.56), view_up=(0.18, 0.00, 0.98)) renderer.add(stream_actor)
from dipy.io.stateful_tractogram import Space, StatefulTractogram
from dipy.io.streamline import save_trk
prob_dg = ProbabilisticDirectionGetter.from_pmf(odf,
max_angle=30.,
sphere=sphere)
streamline_generator = LocalTracking(prob_dg,
stopping_criterion,
seeds,
affine,
step_size=.5)
streamlines = Streamlines(streamline_generator)
color = colormap.line_colors(streamlines)
streamlines_actor = actor.streamtube(list(
transform_streamlines(streamlines, inv(t1_aff))),
color,
linewidth=0.1)
vol_actor = actor.slicer(t1_data)
vol_actor.display(x=40)
vol_actor2 = vol_actor.copy()
vol_actor2.display(z=35)
scene = window.Scene()
scene.add(vol_actor)
scene.add(vol_actor2)
scene.add(streamlines_actor)
if interactive:
window.show(scene)
def bundle_analysis(model_bundle_folder,
bundle_folder,
orig_bundle_folder,
metric_folder,
group,
subject,
no_disks=100,
out_dir=''):
"""
Applies statistical analysis on bundles and saves the results
in a directory specified by ``out_dir``.
Parameters
----------
model_bundle_folder : string
Path to the input model bundle files. This path may contain
wildcards to process multiple inputs at once.
bundle_folder : string
Path to the input bundle files in common space. This path may
contain wildcards to process multiple inputs at once.
orig_folder : string
Path to the input bundle files in native space. This path may
contain wildcards to process multiple inputs at once.
metric_folder : string
Path to the input dti metric or/and peak files. It will be used as
metric for statistical analysis of bundles.
group : string
what group subject belongs to e.g. control or patient
subject : string
subject id e.g. 10001
no_disks : integer, optional
Number of disks used for dividing bundle into disks. (Default 100)
out_dir : string, optional
Output directory (default input file directory)
References
----------
.. [Chandio19] Chandio, B.Q., S. Koudoro, D. Reagan, J. Harezlak,
E. Garyfallidis, Bundle Analytics: a computational and statistical
analyses framework for tractometric studies, Proceedings of:
International Society of Magnetic Resonance in Medicine (ISMRM),
Montreal, Canada, 2019.
"""
dt = dict()
mb = os.listdir(model_bundle_folder)
mb.sort()
bd = os.listdir(bundle_folder)
bd.sort()
org_bd = os.listdir(orig_bundle_folder)
org_bd.sort()
n = len(org_bd)
for io in range(n):
mbundles = load_tractogram(os.path.join(model_bundle_folder, mb[io]),
'same',
bbox_valid_check=False).streamlines
bundles = load_tractogram(os.path.join(bundle_folder, bd[io]),
'same',
bbox_valid_check=False).streamlines
orig_bundles = load_tractogram(os.path.join(orig_bundle_folder,
org_bd[io]),
'same',
bbox_valid_check=False).streamlines
mbundle_streamlines = set_number_of_points(mbundles,
nb_points=no_disks)
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=25., metric=metric)
clusters = qb.cluster(mbundle_streamlines)
centroids = Streamlines(clusters.centroids)
print('Number of centroids ', len(centroids._data))
print('Model bundle ', mb[io])
print('Number of streamlines in bundle in common space ', len(bundles))
print('Number of streamlines in bundle in original space ',
len(orig_bundles))
_, indx = cKDTree(centroids._data, 1,
copy_data=True).query(bundles._data, k=1)
metric_files_names = os.listdir(metric_folder)
_, affine = load_nifti(os.path.join(metric_folder, "fa.nii.gz"))
affine_r = np.linalg.inv(affine)
transformed_orig_bundles = transform_streamlines(
orig_bundles, affine_r)
for mn in range(0, len(metric_files_names)):
ind = np.array(indx)
fm = metric_files_names[mn][:2]
bm = mb[io][:-4]
dt = dict()
metric_name = os.path.join(metric_folder, metric_files_names[mn])
if metric_files_names[mn][2:] == '.nii.gz':
metric, _ = load_nifti(metric_name)
dti_measures(transformed_orig_bundles, metric, dt, fm, bm,
subject, group, ind, out_dir)
else:
fm = metric_files_names[mn][:3]
metric = load_peaks(metric_name)
peak_values(bundles, metric, dt, fm, bm, subject, group, ind,
out_dir)
if __name__ == '__mian__':
from pyfat.io.load import load_tck
from dipy.io.pickles import save_pickle
from dipy.segment.clustering import QuickBundles
from dipy.segment.metric import SumPointwiseEuclideanMetric
# load fiber data
data_path = '/home/brain/workingdir/data/dwi/hcp/' \
'preprocessed/response_dhollander/101006/result/CC_fib.tck'
imgtck = load_tck(data_path)
world_coords = True
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(imgtck.streamlines,
np.linalg.inv(imgtck.affine))
metric = SumPointwiseEuclideanMetric(feature=ArcLengthFeature())
qb = QuickBundles(threshold=2., metric=metric)
clusters = qb.cluster(streamlines)
# extract > 100
# print len(clusters) # 89
for c in clusters:
if len(c) < 100:
clusters.remove_cluster(c)
out_path = '/home/brain/workingdir/data/dwi/hcp/' \
'preprocessed/response_dhollander/101006/result/CC_fib_length1_2.png'
show(imgtck, clusters, out_path)
def optimize(self, static, moving, mat=None):
""" Find the minimum of the provided metric.
Parameters
----------
static : streamlines
Reference or fixed set of streamlines.
moving : streamlines
Moving set of streamlines.
mat : array
Transformation (4, 4) matrix to start the registration. ``mat``
is applied to moving. Default value None which means that initial
transformation will be generated by shifting the centers of moving
and static sets of streamlines to the origin.
Returns
-------
map : StreamlineRegistrationMap
"""
msg = 'need to have the same number of points. Use '
msg += 'set_number_of_points from dipy.tracking.streamline'
if not np.all(np.array(list(map(len, static))) == static[0].shape[0]):
raise ValueError('Static streamlines ' + msg)
if not np.all(np.array(list(map(len, moving))) == moving[0].shape[0]):
raise ValueError('Moving streamlines ' + msg)
if not np.all(np.array(list(map(len, moving))) == static[0].shape[0]):
raise ValueError('Static and moving streamlines ' + msg)
if mat is None:
static_centered, static_shift = center_streamlines(static)
moving_centered, moving_shift = center_streamlines(moving)
static_mat = compose_matrix44(
[static_shift[0], static_shift[1], static_shift[2], 0, 0, 0])
moving_mat = compose_matrix44([
-moving_shift[0], -moving_shift[1], -moving_shift[2], 0, 0, 0
])
else:
static_centered = static
moving_centered = transform_streamlines(moving, mat)
static_mat = np.eye(4)
moving_mat = mat
self.metric.setup(static_centered, moving_centered)
distance = self.metric.distance
if self.method == 'Powell':
if self.options is None:
self.options = {'xtol': 1e-6, 'ftol': 1e-6, 'maxiter': 1e6}
opt = Optimizer(distance,
self.x0.tolist(),
method=self.method,
options=self.options,
evolution=self.evolution)
if self.method == 'L-BFGS-B':
if self.options is None:
self.options = {
'maxcor': 10,
'ftol': 1e-7,
'gtol': 1e-5,
'eps': 1e-8,
'maxiter': 100
}
opt = Optimizer(distance,
self.x0.tolist(),
method=self.method,
bounds=self.bounds,
options=self.options,
evolution=self.evolution)
if self.verbose:
opt.print_summary()
opt_mat = compose_matrix44(opt.xopt)
mat = compose_transformations(moving_mat, opt_mat, static_mat)
mat_history = []
if opt.evolution is not None:
for vecs in opt.evolution:
mat_history.append(
compose_transformations(moving_mat, compose_matrix44(vecs),
static_mat))
srm = StreamlineRegistrationMap(mat, opt.xopt, opt.fopt, mat_history,
opt.nfev, opt.nit)
del opt
return srm
def run(self, static_files, moving_files,
x0='affine',
rm_small_clusters=50,
qbx_thr=[40, 30, 20, 15],
num_threads=None,
greater_than=50,
less_than=250,
nb_pts=20,
progressive=True,
out_dir='',
out_moved='moved.trk',
out_affine='affine.txt',
out_stat_centroids='static_centroids.trk',
out_moving_centroids='moving_centroids.trk',
out_moved_centroids='moved_centroids.trk'):
""" Streamline-based linear registration.
For efficiency we apply the registration on cluster centroids and
remove small clusters.
Parameters
----------
static_files : string
moving_files : string
x0 : string, optional
rigid, similarity or affine transformation model (default affine)
rm_small_clusters : int, optional
Remove clusters that have less than `rm_small_clusters`
(default 50)
qbx_thr : variable int, optional
Thresholds for QuickBundlesX (default [40, 30, 20, 15])
num_threads : int, optional
Number of threads. If None (default) then all available threads
will be used. Only metrics using OpenMP will use this variable.
greater_than : int, optional
Keep streamlines that have length greater than
this value (default 50)
less_than : int, optional
Keep streamlines have length less than this value (default 250)
np_pts : int, optional
Number of points for discretizing each streamline (default 20)
progressive : boolean, optional
(default True)
out_dir : string, optional
Output directory (default input file directory)
out_moved : string, optional
Filename of moved tractogram (default 'moved.trk')
out_affine : string, optional
Filename of affine for SLR transformation (default 'affine.txt')
out_stat_centroids : string, optional
Filename of static centroids (default 'static_centroids.trk')
out_moving_centroids : string, optional
Filename of moving centroids (default 'moving_centroids.trk')
out_moved_centroids : string, optional
Filename of moved centroids (default 'moved_centroids.trk')
Notes
-----
The order of operations is the following. First short or long
streamlines are removed. Second the tractogram or a random selection
of the tractogram is clustered with QuickBundlesX. Then SLR
[Garyfallidis15]_ is applied.
References
----------
.. [Garyfallidis15] Garyfallidis et al. "Robust and efficient linear
registration of white-matter fascicles in the space of
streamlines", NeuroImage, 117, 124--140, 2015
.. [Garyfallidis14] Garyfallidis et al., "Direct native-space fiber
bundle alignment for group comparisons", ISMRM, 2014.
.. [Garyfallidis17] Garyfallidis et al. Recognition of white matter
bundles using local and global streamline-based registration
and clustering, Neuroimage, 2017.
"""
io_it = self.get_io_iterator()
logging.info("QuickBundlesX clustering is in use")
logging.info('QBX thresholds {0}'.format(qbx_thr))
for static_file, moving_file, out_moved_file, out_affine_file, \
static_centroids_file, moving_centroids_file, \
moved_centroids_file in io_it:
logging.info('Loading static file {0}'.format(static_file))
logging.info('Loading moving file {0}'.format(moving_file))
static, static_header = load_trk(static_file)
moving, moving_header = load_trk(moving_file)
moved, affine, centroids_static, centroids_moving = \
slr_with_qbx(
static, moving, x0, rm_small_clusters=rm_small_clusters,
greater_than=greater_than, less_than=less_than,
qbx_thr=qbx_thr)
logging.info('Saving output file {0}'.format(out_moved_file))
save_trk(out_moved_file, moved, affine=np.eye(4),
header=static_header)
logging.info('Saving output file {0}'.format(out_affine_file))
np.savetxt(out_affine_file, affine)
logging.info('Saving output file {0}'
.format(static_centroids_file))
save_trk(static_centroids_file, centroids_static, affine=np.eye(4),
header=static_header)
logging.info('Saving output file {0}'
.format(moving_centroids_file))
save_trk(moving_centroids_file, centroids_moving,
affine=np.eye(4),
header=static_header)
centroids_moved = transform_streamlines(centroids_moving, affine)
logging.info('Saving output file {0}'
.format(moved_centroids_file))
save_trk(moved_centroids_file, centroids_moved, affine=np.eye(4),
header=static_header)
def main():
parser = _build_arg_parser()
args = parser.parse_args()
assert_inputs_exist(parser, [args.in_tractogram, args.in_transfo])
assert_outputs_exist(parser, args, args.out_tractogram)
if args.verbose:
log_level = logging.INFO
logging.basicConfig(level=log_level)
wb_file = load_tractogram_with_reference(parser, args, args.in_tractogram)
wb_streamlines = wb_file.streamlines
model_file = load_tractogram_with_reference(parser, args, args.in_model)
transfo = load_matrix_in_any_format(args.in_transfo)
if args.inverse:
transfo = np.linalg.inv(load_matrix_in_any_format(args.in_transfo))
before, after = compute_distance_barycenters(wb_file, model_file, transfo)
if after > before:
logging.warning('The distance between volumes barycenter should be '
'lower after registration. Maybe try using/removing '
'--inverse.')
logging.info('Distance before: {}, Distance after: {}'.format(
np.round(before, 3), np.round(after, 3)))
model_streamlines = transform_streamlines(model_file.streamlines, transfo)
rng = np.random.RandomState(args.seed)
if args.in_pickle:
with open(args.in_pickle, 'rb') as infile:
cluster_map = pickle.load(infile)
reco_obj = RecoBundles(wb_streamlines,
cluster_map=cluster_map,
rng=rng,
less_than=1,
verbose=args.verbose)
else:
reco_obj = RecoBundles(wb_streamlines,
clust_thr=args.tractogram_clustering_thr,
rng=rng,
greater_than=1,
verbose=args.verbose)
if args.out_pickle:
with open(args.out_pickle, 'wb') as outfile:
pickle.dump(reco_obj.cluster_map, outfile)
_, indices = reco_obj.recognize(ArraySequence(model_streamlines),
args.model_clustering_thr,
pruning_thr=args.pruning_thr,
slr_num_threads=args.slr_threads)
new_streamlines = wb_streamlines[indices]
new_data_per_streamlines = wb_file.data_per_streamline[indices]
new_data_per_points = wb_file.data_per_point[indices]
if not args.no_empty or new_streamlines:
sft = StatefulTractogram(new_streamlines,
wb_file.space_attributes,
Space.RASMM,
data_per_streamline=new_data_per_streamlines,
data_per_point=new_data_per_points)
save_tractogram(sft, args.out_tractogram)
def warp_tractogram(streamlines, transfo, deformation_data, source):
"""
Warp tractogram using a deformation map.
Support Ants and Dipy deformation map.
Apply warp in-place
Parameters
----------
streamlines: list or ArraySequence
Streamlines as loaded by the nibabel API (RASMM)
transfo: numpy.ndarray
Transformation matrix to bring streamlines from RASMM to Voxel space
deformation_data: numpy.ndarray
4D numpy array containing a 3D displacement vector in each voxel
source: str
Source of the deformation map [ants, dipy]
"""
if source == 'ants':
flip = [-1, -1, 1]
elif source == 'dipy':
flip = [1, 1, 1]
# Because of duplication, an iteration over chunks of points is necessary
# for a big dataset (especially if not compressed)
nb_points = len(streamlines._data)
current_position = 0
chunk_size = 1000000
nb_iteration = int(np.ceil(nb_points/chunk_size))
inv_transfo = np.linalg.inv(transfo)
while nb_iteration > 0:
max_position = min(current_position + chunk_size, nb_points)
streamline = streamlines._data[current_position:max_position]
# To access the deformation information, we need to go in voxel space
streamline_vox = transform_streamlines(streamline,
inv_transfo)
current_streamline_vox = np.array(streamline_vox).T
current_streamline_vox_list = current_streamline_vox.tolist()
x_def = ndimage.map_coordinates(deformation_data[..., 0],
current_streamline_vox_list, order=1)
y_def = ndimage.map_coordinates(deformation_data[..., 1],
current_streamline_vox_list, order=1)
z_def = ndimage.map_coordinates(deformation_data[..., 2],
current_streamline_vox_list, order=1)
# ITK is in LPS and nibabel is in RAS, a flip is necessary for ANTs
final_streamline = np.array([flip[0]*x_def,
flip[1]*y_def,
flip[2]*z_def])
# The deformation obtained is in worldSpace
if source == 'ants':
final_streamline += np.array(streamline).T
elif source == 'dipy':
final_streamline += current_streamline_vox
# The tractogram need to be brought back in world space to be saved
final_streamline = transform_streamlines(final_streamline,
transfo)
streamlines._data[current_position:max_position] \
= final_streamline.T
current_position = max_position
nb_iteration -= 1
trk_preprocess_postrigid_affine = os.path.join(path_trk_tempdir, f'{subj}_preprocess_postrigid_affine.trk')
#trans = os.path.join(work_dir, "preprocess", "base_images", "translation_xforms", f"{subj}_0DerivedInitialMovingTranslation.mat")
#rigid = os.path.join(work_dir, "dwi", f"{subj}_rigid.mat")
#affine = os.path.join(work_dir, "dwi", f"{subj}_affine.mat")
#runno_to_MDT = os.path.join(work_dir, f'dwi/SyN_0p5_3_0p5_fa/faMDT_NoNameYet_n37_i6/reg_diffeo/{subj}_to_MDT_warp.nii.gz')
_, exists = check_files([trans, rigid, affine, runno_to_MDT])
if np.any(exists==0):
raise Exception('missing transform file')
affine_map_test = get_affine_transform(reference, subj_dwi)
streamlines, header = unload_trk(subj_trk)
tmp2_streamlines = transform_streamlines(streamlines, np.linalg.inv(affine_map_test), in_place=False)
if (not os.path.exists(trk_filepath_tmp2) or overwrite) and save_temp_files:
save_trk_header(filepath= trk_filepath_tmp2, streamlines = tmp2_streamlines, header = header, affine=np.eye(4), verbose=verbose)
#tmp2_streamlines, header_new = unload_trk(trk_filepath_tmp2)
affine_transform, newaffine = get_flip_affine(orientation_in, orientation_out)
affine_transform_new = affine_transform
#affine_transform[:3,3] = affine_transform.diagonal()[:3]* header[0][:3,3] - header[0][:3,3]
center1 = header[0][:3, 3]
center2 = affine_transform.diagonal()[:3] * center1[:3]
affine_transform_new[:3, 3] = center1 - center2
affine_transform_new[1, 3] = affine_transform[0, 3]
###############################################################################
# With our current design it is easy to decide in which space you want the
# streamlines and slices to appear. The default we have here is to appear in
# world coordinates (RAS 1mm).
world_coords = True
###############################################################################
# If we want to see the objects in native space we need to make sure that all
# objects which are currently in world coordinates are transformed back to
# native space using the inverse of the affine.
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(affine))
###############################################################################
# Now we create, a ``Scene`` object and add the streamlines using the
# ``line`` function and an image plane using the ``slice`` function.
scene = window.Scene()
stream_actor = actor.line(streamlines)
if not world_coords:
image_actor_z = actor.slicer(data, affine=np.eye(4))
else:
image_actor_z = actor.slicer(data, affine)
###############################################################################
# We can also change also the opacity of the slicer.
def run(self,
static_files,
moving_files,
x0='affine',
rm_small_clusters=50,
qbx_thr=[40, 30, 20, 15],
num_threads=None,
greater_than=50,
less_than=250,
nb_pts=20,
progressive=True,
out_dir='',
out_moved='moved.trk',
out_affine='affine.txt',
out_stat_centroids='static_centroids.trk',
out_moving_centroids='moving_centroids.trk',
out_moved_centroids='moved_centroids.trk'):
""" Streamline-based linear registration.
For efficiency we apply the registration on cluster centroids and
remove small clusters.
Parameters
----------
static_files : string
moving_files : string
x0 : string, optional
rigid, similarity or affine transformation model (default affine)
rm_small_clusters : int, optional
Remove clusters that have less than `rm_small_clusters`
(default 50)
qbx_thr : variable int, optional
Thresholds for QuickBundlesX (default [40, 30, 20, 15])
num_threads : int, optional
Number of threads. If None (default) then all available threads
will be used. Only metrics using OpenMP will use this variable.
greater_than : int, optional
Keep streamlines that have length greater than
this value (default 50)
less_than : int, optional
Keep streamlines have length less than this value (default 250)
np_pts : int, optional
Number of points for discretizing each streamline (default 20)
progressive : boolean, optional
(default True)
out_dir : string, optional
Output directory (default input file directory)
out_moved : string, optional
Filename of moved tractogram (default 'moved.trk')
out_affine : string, optional
Filename of affine for SLR transformation (default 'affine.txt')
out_stat_centroids : string, optional
Filename of static centroids (default 'static_centroids.trk')
out_moving_centroids : string, optional
Filename of moving centroids (default 'moving_centroids.trk')
out_moved_centroids : string, optional
Filename of moved centroids (default 'moved_centroids.trk')
Notes
-----
The order of operations is the following. First short or long
streamlines are removed. Second the tractogram or a random selection
of the tractogram is clustered with QuickBundlesX. Then SLR
[Garyfallidis15]_ is applied.
References
----------
.. [Garyfallidis15] Garyfallidis et al. "Robust and efficient linear
registration of white-matter fascicles in the space of
streamlines", NeuroImage, 117, 124--140, 2015
.. [Garyfallidis14] Garyfallidis et al., "Direct native-space fiber
bundle alignment for group comparisons", ISMRM, 2014.
.. [Garyfallidis17] Garyfallidis et al. Recognition of white matter
bundles using local and global streamline-based registration
and clustering, Neuroimage, 2017.
"""
io_it = self.get_io_iterator()
logging.info("QuickBundlesX clustering is in use")
logging.info('QBX thresholds {0}'.format(qbx_thr))
for static_file, moving_file, out_moved_file, out_affine_file, \
static_centroids_file, moving_centroids_file, \
moved_centroids_file in io_it:
logging.info('Loading static file {0}'.format(static_file))
logging.info('Loading moving file {0}'.format(moving_file))
static, static_header = load_trk(static_file)
moving, moving_header = load_trk(moving_file)
moved, affine, centroids_static, centroids_moving = \
slr_with_qbx(
static, moving, x0, rm_small_clusters=rm_small_clusters,
greater_than=greater_than, less_than=less_than,
qbx_thr=qbx_thr)
logging.info('Saving output file {0}'.format(out_moved_file))
save_trk(out_moved_file,
moved,
affine=np.eye(4),
header=static_header)
logging.info('Saving output file {0}'.format(out_affine_file))
np.savetxt(out_affine_file, affine)
logging.info(
'Saving output file {0}'.format(static_centroids_file))
save_trk(static_centroids_file,
centroids_static,
affine=np.eye(4),
header=static_header)
logging.info(
'Saving output file {0}'.format(moving_centroids_file))
save_trk(moving_centroids_file,
centroids_moving,
affine=np.eye(4),
header=static_header)
centroids_moved = transform_streamlines(centroids_moving, affine)
logging.info('Saving output file {0}'.format(moved_centroids_file))
save_trk(moved_centroids_file,
centroids_moved,
affine=np.eye(4),
header=static_header)
def test_bundle_maps():
renderer = window.renderer()
bundle = fornix_streamlines()
bundle, shift = center_streamlines(bundle)
mat = np.array([[1, 0, 0, 100],
[0, 1, 0, 100],
[0, 0, 1, 100],
[0, 0, 0, 1.]])
bundle = transform_streamlines(bundle, mat)
# metric = np.random.rand(*(200, 200, 200))
metric = 100 * np.ones((200, 200, 200))
# add lower values
metric[100, :, :] = 100 * 0.5
# create a nice orange-red colormap
lut = actor.colormap_lookup_table(scale_range=(0., 100.),
hue_range=(0., 0.1),
saturation_range=(1, 1),
value_range=(1., 1))
line = actor.line(bundle, metric, linewidth=0.1, lookup_colormap=lut)
window.add(renderer, line)
window.add(renderer, actor.scalar_bar(lut, ' '))
report = window.analyze_renderer(renderer)
npt.assert_almost_equal(report.actors, 1)
# window.show(renderer)
renderer.clear()
nb_points = np.sum([len(b) for b in bundle])
values = 100 * np.random.rand(nb_points)
# values[:nb_points/2] = 0
line = actor.streamtube(bundle, values, linewidth=0.1, lookup_colormap=lut)
renderer.add(line)
# window.show(renderer)
report = window.analyze_renderer(renderer)
npt.assert_equal(report.actors_classnames[0], 'vtkLODActor')
renderer.clear()
colors = np.random.rand(nb_points, 3)
# values[:nb_points/2] = 0
line = actor.line(bundle, colors, linewidth=2)
renderer.add(line)
# window.show(renderer)
report = window.analyze_renderer(renderer)
npt.assert_equal(report.actors_classnames[0], 'vtkLODActor')
# window.show(renderer)
arr = window.snapshot(renderer)
report2 = window.analyze_snapshot(arr)
npt.assert_equal(report2.objects, 1)
# try other input options for colors
renderer.clear()
actor.line(bundle, (1., 0.5, 0))
actor.line(bundle, np.arange(len(bundle)))
actor.line(bundle)
colors = [np.random.rand(*b.shape) for b in bundle]
actor.line(bundle, colors=colors)
def run(self, static_files, moving_files,
x0='affine',
rm_small_clusters=50,
qbx_thr=[40, 30, 20, 15],
num_threads=None,
greater_than=50,
less_than=250,
nb_pts=20,
progressive=True,
out_dir='',
out_moved='moved.trk',
out_affine='affine.txt',
out_stat_centroids='static_centroids.trk',
out_moving_centroids='moving_centroids.trk',
out_moved_centroids='moved_centroids.trk'):
""" Streamline-based linear registration.
For efficiency we apply the registration on cluster centroids and
remove small clusters.
Parameters
----------
static_files : string
moving_files : string
x0 : string, optional
rigid, similarity or affine transformation model.
rm_small_clusters : int, optional
Remove clusters that have less than `rm_small_clusters`.
qbx_thr : variable int, optional
Thresholds for QuickBundlesX.
num_threads : int, optional
Number of threads to be used for OpenMP parallelization. If None
(default) the value of OMP_NUM_THREADS environment variable is
used if it is set, otherwise all available threads are used. If
< 0 the maximal number of threads minus |num_threads + 1| is used
(enter -1 to use as many threads as possible). 0 raises an error.
Only metrics using OpenMP will use this variable.
greater_than : int, optional
Keep streamlines that have length greater than
this value.
less_than : int, optional
Keep streamlines have length less than this value.
np_pts : int, optional
Number of points for discretizing each streamline.
progressive : boolean, optional
out_dir : string, optional
Output directory. (default current directory)
out_moved : string, optional
Filename of moved tractogram.
out_affine : string, optional
Filename of affine for SLR transformation.
out_stat_centroids : string, optional
Filename of static centroids.
out_moving_centroids : string, optional
Filename of moving centroids.
out_moved_centroids : string, optional
Filename of moved centroids.
Notes
-----
The order of operations is the following. First short or long
streamlines are removed. Second the tractogram or a random selection
of the tractogram is clustered with QuickBundlesX. Then SLR
[Garyfallidis15]_ is applied.
References
----------
.. [Garyfallidis15] Garyfallidis et al. "Robust and efficient linear
registration of white-matter fascicles in the space of
streamlines", NeuroImage, 117, 124--140, 2015
.. [Garyfallidis14] Garyfallidis et al., "Direct native-space fiber
bundle alignment for group comparisons", ISMRM, 2014.
.. [Garyfallidis17] Garyfallidis et al. Recognition of white matter
bundles using local and global streamline-based registration
and clustering, NeuroImage, 2017.
"""
io_it = self.get_io_iterator()
logging.info("QuickBundlesX clustering is in use")
logging.info('QBX thresholds {0}'.format(qbx_thr))
for static_file, moving_file, out_moved_file, out_affine_file, \
static_centroids_file, moving_centroids_file, \
moved_centroids_file in io_it:
logging.info('Loading static file {0}'.format(static_file))
logging.info('Loading moving file {0}'.format(moving_file))
static_obj = nib.streamlines.load(static_file)
moving_obj = nib.streamlines.load(moving_file)
static, static_header = static_obj.streamlines, static_obj.header
moving, moving_header = moving_obj.streamlines, moving_obj.header
moved, affine, centroids_static, centroids_moving = \
slr_with_qbx(
static, moving, x0, rm_small_clusters=rm_small_clusters,
greater_than=greater_than, less_than=less_than,
qbx_thr=qbx_thr)
logging.info('Saving output file {0}'.format(out_moved_file))
new_tractogram = nib.streamlines.Tractogram(moved,
affine_to_rasmm=np.eye(4))
nib.streamlines.save(new_tractogram, out_moved_file,
header=moving_header)
logging.info('Saving output file {0}'.format(out_affine_file))
np.savetxt(out_affine_file, affine)
logging.info('Saving output file {0}'
.format(static_centroids_file))
new_tractogram = nib.streamlines.Tractogram(centroids_static,
affine_to_rasmm=np.eye(4))
nib.streamlines.save(new_tractogram, static_centroids_file,
header=static_header)
logging.info('Saving output file {0}'
.format(moving_centroids_file))
new_tractogram = nib.streamlines.Tractogram(centroids_moving,
affine_to_rasmm=np.eye(4))
nib.streamlines.save(new_tractogram, moving_centroids_file,
header=moving_header)
centroids_moved = transform_streamlines(centroids_moving, affine)
logging.info('Saving output file {0}'
.format(moved_centroids_file))
new_tractogram = nib.streamlines.Tractogram(centroids_moved,
affine_to_rasmm=np.eye(4))
nib.streamlines.save(new_tractogram, moved_centroids_file,
header=moving_header)
def setup(self, streamline, affine, evals=[0.001, 0, 0], sphere=None):
"""
Set up the necessary components for the LiFE model: the matrix of
fiber-contributions to the DWI signal, and the coordinates of voxels
for which the equations will be solved
Parameters
----------
streamline : list
Streamlines, each is an array of shape (n, 3)
affine : 4 by 4 array
Mapping from the streamline coordinates to the data
evals : list (3 items, optional)
The eigenvalues of the canonical tensor used as a response function
sphere: `dipy.core.Sphere` instance.
Whether to approximate (and cache) the signal on a discrete
sphere. This may confer a significant speed-up in setting up the
problem, but is not as accurate. If `False`, we use the exact
gradients along the streamlines to calculate the matrix, instead of
an approximation. Defaults to use the 724-vertex symmetric sphere
from :mod:`dipy.data`
"""
if sphere is not False:
SignalMaker = LifeSignalMaker(self.gtab,
evals=evals,
sphere=sphere)
if affine is None:
affine = np.eye(4)
streamline = transform_streamlines(streamline, affine)
# Assign some local variables, for shorthand:
all_coords = np.concatenate(streamline)
vox_coords = unique_rows(all_coords.astype(int))
n_vox = vox_coords.shape[0]
# We only consider the diffusion-weighted signals:
n_bvecs = self.gtab.bvals[~self.gtab.b0s_mask].shape[0]
v2f, v2fn = voxel2streamline(streamline, transformed=True,
affine=affine, unique_idx=vox_coords)
# How many fibers in each voxel (this will determine how many
# components are in the fiber part of the matrix):
n_unique_f = np.sum(v2f)
# Preallocate these, which will be used to generate the two sparse
# matrices:
# This one will hold the fiber-predicted signal
f_matrix_sig = np.zeros(n_unique_f * n_bvecs)
f_matrix_row = np.zeros(n_unique_f * n_bvecs)
f_matrix_col = np.zeros(n_unique_f * n_bvecs)
keep_ct = 0
if sphere is not False:
fiber_signal = [SignalMaker.streamline_signal(s) for s in streamline]
else:
fiber_signal = [streamline_signal(s, self.gtab, evals)
for s in streamline]
# In each voxel:
for v_idx, vox in enumerate(vox_coords):
# dbg:
# print(100*float(v_idx)/n_vox)
# For each fiber:
for f_idx in np.where(v2f[v_idx])[0]:
# Sum the signal from each node of the fiber in that voxel:
vox_fiber_sig = np.zeros(n_bvecs)
for node_idx in np.where(v2fn[f_idx] == v_idx)[0]:
this_signal = fiber_signal[f_idx][node_idx]
vox_fiber_sig += (this_signal - np.mean(this_signal))
# For each fiber-voxel combination, we now store the row/column
# indices and the signal in the pre-allocated linear arrays
f_matrix_row[keep_ct:keep_ct+n_bvecs] =\
np.arange(n_bvecs) + v_idx * n_bvecs
f_matrix_col[keep_ct:keep_ct+n_bvecs] =\
np.ones(n_bvecs) * f_idx
f_matrix_sig[keep_ct:keep_ct+n_bvecs] = vox_fiber_sig
keep_ct += n_bvecs
# Allocate the sparse matrix, using the more memory-efficient 'csr'
# format (converted from the coo format, which we rely on for the
# initial allocation):
life_matrix = sps.coo_matrix((f_matrix_sig,
[f_matrix_row, f_matrix_col])).tocsr()
return life_matrix, vox_coords
def setup(self,
streamline,
affine,
evals=[0.001, 0, 0],
sphere=None,
processes=1,
verbose=False):
"""
Set up the necessary components for the LiFE model: the matrix of
fiber-contributions to the DWI signal, and the coordinates of voxels
for which the equations will be solved
Parameters
----------
streamline : list
Streamlines, each is an array of shape (n, 3)
affine : array_like (4, 4)
The mapping from voxel coordinates to streamline points.
The voxel_to_rasmm matrix, typically from a NIFTI file.
evals : list (3 items, optional)
The eigenvalues of the canonical tensor used as a response
function. Default:[0.001, 0, 0].
sphere: `dipy.core.Sphere` instance.
Whether to approximate (and cache) the signal on a discrete
sphere. This may confer a significant speed-up in setting up the
problem, but is not as accurate. If `False`, we use the exact
gradients along the streamlines to calculate the matrix, instead of
an approximation. Defaults to use the 724-vertex symmetric sphere
from :mod:`dipy.data`
"""
if sphere is not False:
SignalMaker = LifeSignalMaker(self.gtab,
evals=evals,
sphere=sphere)
streamline = transform_streamlines(streamline, affine)
#picklepath1 = '/Users/alex/jacques/fiber_signal_parallel.p'
#fiber_signal=pickle.load(open(picklepath1, "rb"))
#picklepath2 = '/Users/alex/jacques/fiber_signal_orig.p'
#fiber_signal_orig=pickle.load(open(picklepath2, "rb"))
#original location of the vox steps, moved them for faster streamline processing debug
fiber_signal = []
fiber_signal_orig = []
fiber_signal_list = []
skiplist = []
#the stuff that got moved around for faster processing
# Assign some local variables, for shorthand:
#if save_fibsignal:
# pickle.dump(fiber_signal, open(picklepath1, "wb"))
all_coords = np.concatenate(streamline)
vox_coords = unique_rows(np.round(all_coords).astype(np.intp))
del all_coords
# We only consider the diffusion-weighted signals:
n_bvecs = self.gtab.bvals[~self.gtab.b0s_mask].shape[0]
v2f, v2fn = voxel2streamline(streamline,
np.eye(4),
unique_idx=vox_coords)
# How many fibers in each voxel (this will determine how many
# components are in the matrix):
n_unique_f = len(np.hstack(v2f.values()))
"""
save_fibsignal=True
picklepath1 = '/Users/alex/jacques/fiber_signal_parallel_rev.p'
picklepath2 = '/Users/alex/jacques/fiber_signal_parallel.p'
try:
fiber_signal = pickle.load(open(picklepath1, "rb"))
save_fibsignal=False
print("getting Fiber signal from" + picklepath1)
fiber_signal_orig = pickle.load(open(picklepath2, "rb"))
except FileNotFoundError:
"""
print("computing the fiber signal values")
duration1 = time()
if processes > 1:
pool = mp.Pool(processes)
fiber_signal = pool.starmap_async(
fiber_treatment,
[(s, idx, self.gtab, evals, SignalMaker, sphere)
for idx, s in enumerate(streamline)]).get()
#for idx,fiber in enumerate(fiber_signal_list):
pool.close()
else:
for s_idx, s in enumerate(streamline):
streamshape = np.shape(np.asarray(s))
if sphere is not False:
fiber_signal.append(SignalMaker.streamline_signal(s))
else:
fiber_signal.append(streamline_signal(s, self.gtab, evals))
#print("Took care of "+ str(s_idx) + " out of " + str(len(streamline)) + " streamlines")
if verbose:
print("Obtaining fiber signal process done in " +
str(time() - duration1) + "s")
if len(skiplist) > 0:
print("Skipped " + str(len(skiplist)) + " out of " +
str(len(streamline)) +
"due to size constraints (tiny streamlines)")
if sphere is not False:
del SignalMaker
# Preallocate these, which will be used to generate the sparse
# matrix:
f_matrix_sig = np.zeros(n_unique_f * n_bvecs, dtype=np.float)
f_matrix_row = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
f_matrix_col = np.zeros(n_unique_f * n_bvecs, dtype=np.intp)
#end of moved block JS
del streamline
keep_ct = 0
range_bvecs = np.arange(n_bvecs).astype(int)
# In each voxel:
for v_idx in range(vox_coords.shape[0]):
mat_row_idx = (range_bvecs + v_idx * n_bvecs).astype(np.intp)
# For each fiber in that voxel:
for f_idx in v2f[v_idx]:
# For each fiber-voxel combination, store the row/column
# indices in the pre-allocated linear arrays
f_matrix_row[keep_ct:keep_ct + n_bvecs] = mat_row_idx
f_matrix_col[keep_ct:keep_ct + n_bvecs] = f_idx
vox_fiber_sig = np.zeros(n_bvecs)
for node_idx in v2fn[f_idx][v_idx]:
# Sum the signal from each node of the fiber in that voxel:
try:
vox_fiber_sig += fiber_signal[f_idx][node_idx]
except IndexError:
print("hi")
raise IndexError
# And add the summed thing into the corresponding rows:
f_matrix_sig[keep_ct:keep_ct + n_bvecs] += vox_fiber_sig
keep_ct = keep_ct + n_bvecs
del v2f, v2fn
# Allocate the sparse matrix, using the more memory-efficient 'csr'
# format:
life_matrix = sps.csr_matrix(
(f_matrix_sig, [f_matrix_row, f_matrix_col]))
return life_matrix, vox_coords
def optimize(self, static, moving, mat=None):
""" Find the minimum of the provided metric.
Parameters
----------
static : streamlines
Reference or fixed set of streamlines.
moving : streamlines
Moving set of streamlines.
mat : array
Transformation (4, 4) matrix to start the registration. ``mat``
is applied to moving. Default value None which means that initial
transformation will be generated by shifting the centers of moving
and static sets of streamlines to the origin.
Returns
-------
map : StreamlineRegistrationMap
"""
msg = 'need to have the same number of points. Use '
msg += 'set_number_of_points from dipy.tracking.streamline'
if not np.all(np.array(list(map(len, static))) == static[0].shape[0]):
raise ValueError('Static streamlines ' + msg)
if not np.all(np.array(list(map(len, moving))) == moving[0].shape[0]):
raise ValueError('Moving streamlines ' + msg)
if not np.all(np.array(list(map(len, moving))) == static[0].shape[0]):
raise ValueError('Static and moving streamlines ' + msg)
if mat is None:
static_centered, static_shift = center_streamlines(static)
moving_centered, moving_shift = center_streamlines(moving)
static_mat = compose_matrix44([static_shift[0], static_shift[1],
static_shift[2], 0, 0, 0])
moving_mat = compose_matrix44([-moving_shift[0], -moving_shift[1],
-moving_shift[2], 0, 0, 0])
else:
static_centered = static
moving_centered = transform_streamlines(moving, mat)
static_mat = np.eye(4)
moving_mat = mat
self.metric.setup(static_centered, moving_centered)
distance = self.metric.distance
if self.method == 'Powell':
if self.options is None:
self.options = {'xtol': 1e-6, 'ftol': 1e-6, 'maxiter': 1e6}
opt = Optimizer(distance, self.x0.tolist(),
method=self.method, options=self.options,
evolution=self.evolution)
if self.method == 'L-BFGS-B':
if self.options is None:
self.options = {'maxcor': 10, 'ftol': 1e-7,
'gtol': 1e-5, 'eps': 1e-8,
'maxiter': 100}
opt = Optimizer(distance, self.x0.tolist(),
method=self.method,
bounds=self.bounds, options=self.options,
evolution=self.evolution)
if self.verbose:
opt.print_summary()
opt_mat = compose_matrix44(opt.xopt)
mat = compose_transformations(moving_mat, opt_mat, static_mat)
mat_history = []
if opt.evolution is not None:
for vecs in opt.evolution:
mat_history.append(
compose_transformations(moving_mat,
compose_matrix44(vecs),
static_mat))
srm = StreamlineRegistrationMap(mat, opt.xopt, opt.fopt,
mat_history, opt.nfev, opt.nit)
del opt
return srm
def show_results(streamlines, vol, affine, world_coords=True, opacity=0.6):
from dipy.viz import actor, window, widget
shape = data.shape
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(affine))
ren = window.Renderer()
if streamlines is not None:
stream_actor = actor.line(streamlines)
if not world_coords:
image_actor = actor.slicer(vol, affine=np.eye(4))
else:
image_actor = actor.slicer(vol, affine)
slicer_opacity = opacity #.6
image_actor.opacity(slicer_opacity)
if streamlines is not None:
ren.add(stream_actor)
ren.add(image_actor)
show_m = window.ShowManager(ren, size=(1200, 900))
show_m.initialize()
def change_slice(obj, event):
z = int(np.round(obj.get_value()))
image_actor.display_extent(0, shape[0] - 1, 0, shape[1] - 1, z, z)
slider = widget.slider(show_m.iren,
show_m.ren,
callback=change_slice,
min_value=0,
max_value=shape[2] - 1,
value=shape[2] / 2,
label="Move slice",
right_normalized_pos=(.98, 0.6),
size=(120, 0),
label_format="%0.lf",
color=(1., 1., 1.),
selected_color=(0.86, 0.33, 1.))
global size
size = ren.GetSize()
def win_callback(obj, event):
global size
if size != obj.GetSize():
slider.place(ren)
size = obj.GetSize()
show_m.initialize()
show_m.add_window_callback(win_callback)
show_m.render()
show_m.start()
# ren.zoom(1.5)
# ren.reset_clipping_range()
# window.record(ren, out_path='bundles_and_a_slice.png', size=(1200, 900),
# reset_camera=False)
del show_m
else:
return float(b) / a
args = sys.argv[1:]
ref_img_in = args[0]
file_in = args[1]
file_out = args[2]
ref_img = nib.load(ref_img_in)
#ref_img_shape = ref_img.get_data().shape
ref_img_shape = ref_img.header.get_data_shape()
streams, hdr = trackvis.read(file_in)
streamlines = [s[0] for s in streams]
streamlines = transform_streamlines(streamlines, np.linalg.inv(ref_img.affine))
mask_start = np.zeros(ref_img_shape)
mask_end = np.zeros(ref_img_shape)
if len(streamlines) > 0:
startpoints = []
endpoints = []
for streamline in streamlines:
startpoints.append(streamline[0])
endpoints.append(streamline[-1])
points = np.array(startpoints + endpoints)
# Subsample points to make clustering faster
# Has to be at least 50k to work properly for very big tracts like CC (otherwise points too far apart for DBSCAN)
from src.tractography.viz import draw_bundles
from os import listdir # , mkdir
from os.path import isfile # , isdir
from src.tractography.io import read_ply
import argparse
from dipy.align.streamlinear import compose_matrix44
from dipy.tracking.streamline import transform_streamlines
parser = argparse.ArgumentParser(description='Input argument parser.')
parser.add_argument('-f', type=str, help='location of files')
args = parser.parse_args()
data_path = '../data/132118/'
#data_path = args.f
files = [
data_path + f for f in listdir(data_path)
if isfile(data_path + f) and f.endswith('.ply')
]
mat = compose_matrix44([0, 0, 0, 0, 90, 90])
brain = []
for name in files:
brain.append(transform_streamlines(read_ply(name), mat))
draw_bundles(brain, rotate=True)
"""
data1 = read_ply('../data/132118/m_ex_atr-left_shore.ply')
data2 = read_ply('../data/132118/m_ex_atr-right_shore.ply')
draw_bundles([data1,data2])
"""
def evaluate_along_streamlines(scalar_img,
streamlines,
beginnings,
nr_points,
dilate=0,
predicted_peaks=None,
affine=None):
# Runtime:
# - default: 2.7s (test), 56s (all), 10s (test 4 bundles, 100 points)
# - map_coordinate order 1: 1.9s (test), 26s (all), 6s (test 4 bundles, 100 points)
# - map_coordinate order 3: 2.2s (test), 33s (all),
# - values_from_volume: 2.5s (test), 43s (all),
# - AFQ: ?s (test), ?s (all), 85s (test 4 bundles, 100 points)
# => AFQ a lot slower than others
streamlines = list(
transform_streamlines(streamlines, np.linalg.inv(affine)))
for i in range(dilate):
beginnings = binary_dilation(beginnings)
beginnings = beginnings.astype(np.uint8)
streamlines = _orient_to_same_start_region(streamlines, beginnings)
if predicted_peaks is not None:
# scalar img can also be orig peaks
best_orig_peaks = fiber_utils.get_best_original_peaks(
predicted_peaks, scalar_img, peak_len_thr=0.00001)
scalar_img = np.linalg.norm(best_orig_peaks, axis=-1)
algorithm = "distance_map" # equal_dist | distance_map | cutting_plane | afq
if algorithm == "equal_dist":
### Sampling ###
streamlines = fiber_utils.resample_fibers(streamlines,
nb_points=nr_points)
values = map_coordinates(scalar_img, np.array(streamlines).T, order=1)
### Aggregation ###
values_mean = np.array(values).mean(axis=1)
values_std = np.array(values).std(axis=1)
return values_mean, values_std
if algorithm == "distance_map": # cKDTree
### Sampling ###
streamlines = fiber_utils.resample_fibers(streamlines,
nb_points=nr_points)
values = map_coordinates(scalar_img, np.array(streamlines).T, order=1)
### Aggregating by cKDTree approach ###
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=100., metric=metric)
clusters = qb.cluster(streamlines)
centroids = Streamlines(clusters.centroids)
if len(centroids) > 1:
print("WARNING: number clusters > 1 ({})".format(len(centroids)))
_, segment_idxs = cKDTree(centroids.data, 1,
copy_data=True).query(streamlines,
k=1) # (2000, 100)
values_t = np.array(values).T # (2000, 100)
# If we want to take weighted mean like in AFQ:
# weights = dsa.gaussian_weights(Streamlines(streamlines))
# values_t = weights * values_t
# return np.sum(values_t, 0), None
results_dict = defaultdict(list)
for idx, sl in enumerate(values_t):
for jdx, seg in enumerate(sl):
results_dict[segment_idxs[idx, jdx]].append(seg)
if len(results_dict.keys()) < nr_points:
print(
"WARNING: found less than required points. Filling up with centroid values."
)
centroid_values = map_coordinates(scalar_img,
np.array([centroids[0]]).T,
order=1)
for i in range(nr_points):
if len(results_dict[i]) == 0:
results_dict[i].append(np.array(centroid_values).T[0, i])
results_mean = []
results_std = []
for key in sorted(results_dict.keys()):
value = results_dict[key]
if len(value) > 0:
results_mean.append(np.array(value).mean())
results_std.append(np.array(value).std())
else:
print("WARNING: empty segment")
results_mean.append(0)
results_std.append(0)
return results_mean, results_std
elif algorithm == "cutting_plane":
# This will resample all streamline to have equally distant points (resulting in a different number of points
# in each streamline). Then the "middle" of the tract will be estimated taking the middle element of the
# centroid (estimated with QuickBundles). Then each streamline the point closest to the "middle" will be
# calculated and points will be indexed for each streamline starting from the middle. Then averaging across
# all streamlines will be done by taking the mean for points with same indices.
### Sampling ###
streamlines = fiber_utils.resample_to_same_distance(
streamlines, max_nr_points=nr_points)
# map_coordinates does not allow streamlines with different lengths -> use values_from_volume
values = np.array(
values_from_volume(scalar_img, streamlines, affine=np.eye(4))).T
### Aggregating by Cutting Plane approach ###
# Resample to all fibers having same number of points -> needed for QuickBundles
streamlines_resamp = fiber_utils.resample_fibers(streamlines,
nb_points=nr_points)
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=100., metric=metric)
clusters = qb.cluster(streamlines_resamp)
centroids = Streamlines(clusters.centroids)
# index of the middle cluster
middle_idx = int(nr_points / 2)
middle_point = centroids[0][middle_idx]
# For each streamline get idx for the point which is closest to the middle
segment_idxs = fiber_utils.get_idxs_of_closest_points(
streamlines, middle_point)
# Align along the middle and assign indices
segment_idxs_eqlen = []
base_idx = 1000 # use higher index to avoid negative numbers for area below middle
for idx, sl in enumerate(streamlines):
sl_middle_pos = segment_idxs[idx]
before_elems = sl_middle_pos
after_elems = len(sl) - sl_middle_pos
# indices for one streamline e.g. [998, 999, 1000, 1001, 1002, 1003]; 1000 is middle
r = range((base_idx - before_elems), (base_idx + after_elems))
segment_idxs_eqlen.append(r)
segment_idxs = segment_idxs_eqlen
# Calcuate maximum number of indices to not result in more indices than nr_points.
# (this could be case if one streamline is very off-center and therefore has a lot of points only on one
# side. In this case the values too far out of this streamline will be cut off).
max_idx = base_idx + int(nr_points / 2)
min_idx = base_idx - int(nr_points / 2)
# Group by segment indices
results_dict = defaultdict(list)
for idx, sl in enumerate(values):
for jdx, seg in enumerate(sl):
current_idx = segment_idxs[idx][jdx]
if current_idx >= min_idx and current_idx < max_idx:
results_dict[current_idx].append(seg)
# If values missing fill up with centroid values
if len(results_dict.keys()) < nr_points:
print(
"WARNING: found less than required points. Filling up with centroid values."
)
centroid_sl = [centroids[0]]
centroid_sl = np.array(centroid_sl).T
centroid_values = map_coordinates(scalar_img, centroid_sl, order=1)
for idx, seg_idx in enumerate(range(min_idx, max_idx)):
if len(results_dict[seg_idx]) == 0:
results_dict[seg_idx].append(
np.array(centroid_values).T[0, idx])
# Aggregate by mean
results_mean = []
results_std = []
for key in sorted(results_dict.keys()):
value = results_dict[key]
if len(value) > 0:
results_mean.append(np.array(value).mean())
results_std.append(np.array(value).std())
else:
print("WARNING: empty segment")
results_mean.append(0)
results_std.append(0)
return results_mean, results_std
elif algorithm == "afq":
### sampling + aggregation ###
streamlines = fiber_utils.resample_fibers(streamlines,
nb_points=nr_points)
streamlines = Streamlines(streamlines)
weights = dsa.gaussian_weights(streamlines)
results_mean = dsa.afq_profile(scalar_img,
streamlines,
affine=np.eye(4),
weights=weights)
results_std = np.zeros(nr_points)
return results_mean, results_std
with open(picklepath_connectome, 'rb') as f:
M = pickle.load(f)
if os.path.exists(grouping_xlsxpath):
grouping = extract_grouping(grouping_xlsxpath,
index_to_struct,
None,
verbose=verbose)
else:
if allow_preprun:
labelmask, labelaffine, labeloutpath, index_to_struct = getlabeltypemask(
label_folder,
'MDT',
ROI_legends,
labeltype=labeltype,
verbose=verbose)
streamlines_world = transform_streamlines(
trkdata.streamlines, np.linalg.inv(labelaffine))
#M, grouping = connectivity_matrix_func(trkdata.streamlines, function_processes, labelmask,
# symmetric=True, mapping_as_streamlines=False,
# affine_streams=trkdata.space_attributes[0],
# inclusive=inclusive)
M, grouping = connectivity_matrix_func(
streamlines_world,
np.eye(4),
labelmask,
inclusive=inclusive,
symmetric=symmetric,
return_mapping=True,
mapping_as_streamlines=False,
reference_weighting=None,
volume_weighting=False,
def direct_streamline_norm(streams, fa_path, ap_path, dir_path, track_type,
target_samples, conn_model, network, node_size,
dens_thresh, ID, roi, min_span_tree, disp_filt,
parc, prune, atlas, labels_im_file, uatlas, labels,
coords, norm, binary, atlas_mni, basedir_path,
curv_thr_list, step_list, directget, min_length,
error_margin, t1_aligned_mni):
"""
A Function to perform normalization of streamlines tracked in native
diffusion space to an MNI-space template.
Parameters
----------
streams : str
File path to save streamline array sequence in .trk format.
fa_path : str
File path to FA Nifti1Image.
ap_path : str
File path to the anisotropic power Nifti1Image.
dir_path : str
Path to directory containing subject derivative data for a given
pynets run.
track_type : str
Tracking algorithm used (e.g. 'local' or 'particle').
target_samples : int
Total number of streamline samples specified to generate streams.
conn_model : str
Connectivity reconstruction method (e.g. 'csa', 'tensor', 'csd').
network : str
Resting-state network based on Yeo-7 and Yeo-17 naming (e.g. 'Default')
used to filter nodes in the study of brain subgraphs.
node_size : int
Spherical centroid node size in the case that coordinate-based
centroids are used as ROI's for tracking.
dens_thresh : bool
Indicates whether a target graph density is to be used as the basis for
thresholding.
ID : str
A subject id or other unique identifier.
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
min_span_tree : bool
Indicates whether local thresholding from the Minimum Spanning Tree
should be used.
disp_filt : bool
Indicates whether local thresholding using a disparity filter and
'backbone network' should be used.
parc : bool
Indicates whether to use parcels instead of coordinates as ROI nodes.
prune : bool
Indicates whether to prune final graph of disconnected nodes/isolates.
atlas : str
Name of atlas parcellation used.
labels_im_file : str
File path to atlas parcellation Nifti1Image aligned to dwi space.
uatlas : str
File path to atlas parcellation Nifti1Image in MNI template space.
labels : list
List of string labels corresponding to graph nodes.
coords : list
List of (x, y, z) tuples corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
norm : int
Indicates method of normalizing resulting graph.
binary : bool
Indicates whether to binarize resulting graph edges to form an
unweighted graph.
atlas_mni : str
File path to atlas parcellation Nifti1Image in T1w-warped MNI space.
basedir_path : str
Path to directory to output direct-streamline normalized temp files
and outputs.
curv_thr_list : list
List of integer curvature thresholds used to perform ensemble tracking.
step_list : list
List of float step-sizes used to perform ensemble tracking.
directget : str
The statistical approach to tracking. Options are: det (deterministic),
closest (clos), boot (bootstrapped), and prob (probabilistic).
min_length : int
Minimum fiber length threshold in mm to restrict tracking.
t1_aligned_mni : str
File path to the T1w Nifti1Image in template MNI space.
Returns
-------
streams_warp : str
File path to normalized streamline array sequence in .trk format.
dir_path : str
Path to directory containing subject derivative data for a given
pynets run.
track_type : str
Tracking algorithm used (e.g. 'local' or 'particle').
target_samples : int
Total number of streamline samples specified to generate streams.
conn_model : str
Connectivity reconstruction method (e.g. 'csa', 'tensor', 'csd').
network : str
Resting-state network based on Yeo-7 and Yeo-17 naming (e.g. 'Default')
used to filter nodes in the study of brain subgraphs.
node_size : int
Spherical centroid node size in the case that coordinate-based
centroids are used as ROI's for tracking.
dens_thresh : bool
Indicates whether a target graph density is to be used as the basis for
thresholding.
ID : str
A subject id or other unique identifier.
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
min_span_tree : bool
Indicates whether local thresholding from the Minimum Spanning Tree
should be used.
disp_filt : bool
Indicates whether local thresholding using a disparity filter and
'backbone network' should be used.
parc : bool
Indicates whether to use parcels instead of coordinates as ROI nodes.
prune : bool
Indicates whether to prune final graph of disconnected nodes/isolates.
atlas : str
Name of atlas parcellation used.
uatlas : str
File path to atlas parcellation Nifti1Image in MNI template space.
labels : list
List of string labels corresponding to graph nodes.
coords : list
List of (x, y, z) tuples corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
norm : int
Indicates method of normalizing resulting graph.
binary : bool
Indicates whether to binarize resulting graph edges to form an
unweighted graph.
atlas_mni : str
File path to atlas parcellation Nifti1Image in T1w-warped MNI space.
directget : str
The statistical approach to tracking. Options are: det
(deterministic), closest (clos), boot (bootstrapped),
and prob (probabilistic).
warped_fa : str
File path to MNI-space warped FA Nifti1Image.
min_length : int
Minimum fiber length threshold in mm to restrict tracking.
References
----------
.. [1] Greene, C., Cieslak, M., & Grafton, S. T. (2017). Effect of
different spatial normalization approaches on tractography and structural
brain networks. Network Neuroscience, 1-19.
"""
import sys
import gc
from dipy.tracking.streamline import transform_streamlines
from pynets.registration import reg_utils as regutils
# from pynets.plotting import plot_gen
import pkg_resources
import yaml
import os.path as op
from pynets.registration.reg_utils import vdc
from nilearn.image import resample_to_img
from dipy.io.streamline import load_tractogram
from dipy.tracking import utils
from dipy.tracking._utils import _mapping_to_voxel
from dipy.io.stateful_tractogram import Space, StatefulTractogram, Origin
from dipy.io.streamline import save_tractogram
# from pynets.core.utils import missing_elements
with open(pkg_resources.resource_filename("pynets", "runconfig.yaml"),
"r") as stream:
try:
hardcoded_params = yaml.load(stream)
run_dsn = hardcoded_params['tracking']["DSN"][0]
except FileNotFoundError as e:
import sys
print(e, "Failed to parse runconfig.yaml")
exit(1)
stream.close()
if run_dsn is True:
dsn_dir = f"{basedir_path}/dmri_reg/DSN"
if not op.isdir(dsn_dir):
os.mkdir(dsn_dir)
namer_dir = f"{dir_path}/tractography"
if not op.isdir(namer_dir):
os.mkdir(namer_dir)
atlas_img = nib.load(labels_im_file)
# Run SyN and normalize streamlines
fa_img = nib.load(fa_path)
vox_size = fa_img.header.get_zooms()[0]
template_path = pkg_resources.resource_filename(
"pynets", f"templates/FA_{int(vox_size)}mm.nii.gz")
if sys.platform.startswith('win') is False:
try:
template_img = nib.load(template_path)
except indexed_gzip.ZranError as e:
print(
e, f"\nCannot load FA template. Do you have git-lfs "
f"installed?")
sys.exit(1)
else:
try:
template_img = nib.load(template_path)
except ImportError as e:
print(
e, f"\nCannot load FA template. Do you have git-lfs "
f"installed?")
sys.exit(1)
uatlas_mni_img = nib.load(atlas_mni)
t1_aligned_mni_img = nib.load(t1_aligned_mni)
brain_mask = np.asarray(t1_aligned_mni_img.dataobj).astype("bool")
streams_mni = "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s" % (
namer_dir,
"/streamlines_mni_",
"%s" % (network + "_" if network is not None else ""),
"%s" %
(op.basename(roi).split(".")[0] + "_" if roi is not None else ""),
conn_model,
"_",
target_samples,
"%s" % ("%s%s" % ("_" + str(node_size), "mm_") if
((node_size != "parc") and
(node_size is not None)) else "_"),
"curv",
str(curv_thr_list).replace(", ", "_"),
"step",
str(step_list).replace(", ", "_"),
"tracktype-",
track_type,
"_directget-",
directget,
"_minlength-",
min_length,
"_tol-",
error_margin,
".trk",
)
density_mni = "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s" % (
namer_dir,
"/density_map_mni_",
"%s" % (network + "_" if network is not None else ""),
"%s" %
(op.basename(roi).split(".")[0] + "_" if roi is not None else ""),
conn_model,
"_",
target_samples,
"%s" % ("%s%s" % ("_" + str(node_size), "mm_") if
((node_size != "parc") and
(node_size is not None)) else "_"),
"curv",
str(curv_thr_list).replace(", ", "_"),
"step",
str(step_list).replace(", ", "_"),
"tracktype-",
track_type,
"_directget-",
directget,
"_minlength-",
min_length,
"_tol-",
error_margin,
".nii.gz",
)
# streams_warp_png = '/tmp/dsn.png'
# SyN FA->Template
[mapping, affine_map,
warped_fa] = regutils.wm_syn(template_path, fa_path, t1_aligned_mni,
ap_path, dsn_dir)
tractogram = load_tractogram(
streams,
fa_img,
to_origin=Origin.NIFTI,
to_space=Space.VOXMM,
bbox_valid_check=False,
)
fa_img.uncache()
streamlines = tractogram.streamlines
warped_fa_img = nib.load(warped_fa)
warped_fa_affine = warped_fa_img.affine
warped_fa_shape = warped_fa_img.shape
streams_in_curr_grid = transform_streamlines(streamlines,
warped_fa_affine)
# Create isocenter mapping where we anchor the origin transformation
# affine to the corner of the FOV by scaling x, y, z offsets according
# to a multiplicative van der Corput sequence with a base value equal
# to the voxel resolution
[x_mul, y_mul, z_mul] = [vdc(i, vox_size) for i in range(1, 4)]
ref_grid_aff = vox_size * np.eye(4)
ref_grid_aff[3][3] = 1
streams_final_filt = []
i = 0
# Test for various types of voxel-grid configurations
combs = [(-x_mul, -y_mul, -z_mul), (-x_mul, -y_mul, z_mul),
(-x_mul, y_mul, -z_mul), (x_mul, -y_mul, -z_mul),
(x_mul, y_mul, z_mul)]
while len(streams_final_filt) / len(streams_in_curr_grid) < 0.90:
print(f"Warping streamlines to MNI space. Attempt {i}...")
print(len(streams_final_filt) / len(streams_in_curr_grid))
adjusted_affine = affine_map.affine.copy()
if i > len(combs) - 1:
raise ValueError('DSN failed. Header orientation '
'information may be corrupted. '
'Is your dataset oblique?')
adjusted_affine[0][3] = adjusted_affine[0][3] * combs[i][0]
adjusted_affine[1][3] = adjusted_affine[1][3] * combs[i][1]
adjusted_affine[2][3] = adjusted_affine[2][3] * combs[i][2]
streams_final_filt = regutils.warp_streamlines(
adjusted_affine, ref_grid_aff, mapping, warped_fa_img,
streams_in_curr_grid, brain_mask)
i += 1
# Remove streamlines with negative voxel indices
lin_T, offset = _mapping_to_voxel(np.eye(4))
streams_final_filt_final = []
for sl in streams_final_filt:
inds = np.dot(sl, lin_T)
inds += offset
if not inds.min().round(decimals=6) < 0:
streams_final_filt_final.append(sl)
# Save streamlines
stf = StatefulTractogram(
streams_final_filt_final,
reference=uatlas_mni_img,
space=Space.VOXMM,
origin=Origin.NIFTI,
)
stf.remove_invalid_streamlines()
streams_final_filt_final = stf.streamlines
save_tractogram(stf, streams_mni, bbox_valid_check=True)
warped_fa_img.uncache()
# DSN QC plotting
# plot_gen.show_template_bundles(streams_final_filt_final, atlas_mni,
# streams_warp_png) plot_gen.show_template_bundles(streamlines,
# fa_path, streams_warp_png)
# Create and save MNI density map
nib.save(
nib.Nifti1Image(
utils.density_map(streams_final_filt_final,
affine=np.eye(4),
vol_dims=warped_fa_shape),
warped_fa_affine,
),
density_mni,
)
# Map parcellation from native space back to MNI-space and create an
# 'uncertainty-union' parcellation with original mni-space uatlas
warped_uatlas = affine_map.transform_inverse(
mapping.transform(
np.asarray(atlas_img.dataobj).astype("int"),
interpolation="nearestneighbour",
),
interp="nearest",
)
atlas_img.uncache()
warped_uatlas_img_res_data = np.asarray(
resample_to_img(
nib.Nifti1Image(warped_uatlas, affine=warped_fa_affine),
uatlas_mni_img,
interpolation="nearest",
clip=False,
).dataobj)
uatlas_mni_data = np.asarray(uatlas_mni_img.dataobj)
uatlas_mni_img.uncache()
overlap_mask = np.invert(
warped_uatlas_img_res_data.astype("bool") *
uatlas_mni_data.astype("bool"))
os.makedirs(f"{dir_path}/parcellations", exist_ok=True)
atlas_mni = f"{dir_path}/parcellations/" \
f"{op.basename(uatlas).split('.nii')[0]}_liberal.nii.gz"
nib.save(
nib.Nifti1Image(
warped_uatlas_img_res_data * overlap_mask.astype("int") +
uatlas_mni_data * overlap_mask.astype("int") +
np.invert(overlap_mask).astype("int") *
warped_uatlas_img_res_data.astype("int"),
affine=uatlas_mni_img.affine,
),
atlas_mni,
)
del (
tractogram,
streamlines,
warped_uatlas_img_res_data,
uatlas_mni_data,
overlap_mask,
stf,
streams_final_filt_final,
streams_final_filt,
streams_in_curr_grid,
brain_mask,
)
gc.collect()
assert len(coords) == len(labels)
else:
print(
"Skipping Direct Streamline Normalization (DSN). Will proceed to "
"define fiber connectivity in native diffusion space...")
streams_mni = streams
warped_fa = fa_path
atlas_mni = labels_im_file
return (streams_mni, dir_path, track_type, target_samples, conn_model,
network, node_size, dens_thresh, ID, roi, min_span_tree, disp_filt,
parc, prune, atlas, uatlas, labels, coords, norm, binary,
atlas_mni, directget, warped_fa, min_length, error_margin)
def save_vtk_streamlines(streamlines, filename, to_lps=True, binary=False):
"""Save streamlines as vtk polydata to a supported format file.
File formats can be VTK, FIB
Parameters
----------
streamlines : list
list of 2D arrays or ArraySequence
filename : string
output filename (.vtk or .fib)
to_lps : bool
Default to True, will follow the vtk file convention for streamlines
Will be supported by MITKDiffusion and MI-Brain
binary : bool
save the file as binary
"""
if to_lps:
# ras (mm) to lps (mm)
to_lps = np.eye(4)
to_lps[0, 0] = -1
to_lps[1, 1] = -1
streamlines = transform_streamlines(streamlines, to_lps)
# Get the 3d points_array
nb_lines = len(streamlines)
points_array = np.vstack(streamlines)
# Get lines_array in vtk input format
lines_array = []
current_position = 0
for i in range(nb_lines):
current_len = len(streamlines[i])
end_position = current_position + current_len
lines_array.append(current_len)
lines_array.extend(range(current_position, end_position))
current_position = end_position
# Set Points to vtk array format
vtk_points = vtk.vtkPoints()
vtk_points.SetData(
ns.numpy_to_vtk(points_array.astype(np.float32), deep=True))
# Set Lines to vtk array format
vtk_lines = vtk.vtkCellArray()
vtk_lines.SetNumberOfCells(nb_lines)
vtk_lines.GetData().DeepCopy(
ns.numpy_to_vtk(np.array(lines_array), deep=True))
# Create the poly_data
polydata = vtk.vtkPolyData()
polydata.SetPoints(vtk_points)
polydata.SetLines(vtk_lines)
writer = vtk.vtkPolyDataWriter()
writer.SetFileName(filename)
writer = utils.set_input(writer, polydata)
if binary:
writer.SetFileTypeToBinary()
writer.Update()
writer.Write()
def bundle_analysis(model_bundle_folder, bundle_folder, orig_bundle_folder,
metric_folder, group, subject, no_disks=100,
out_dir=''):
"""
Applies statistical analysis on bundles and saves the results
in a directory specified by ``out_dir``.
Parameters
----------
model_bundle_folder : string
Path to the input model bundle files. This path may contain
wildcards to process multiple inputs at once.
bundle_folder : string
Path to the input bundle files in common space. This path may
contain wildcards to process multiple inputs at once.
orig_folder : string
Path to the input bundle files in native space. This path may
contain wildcards to process multiple inputs at once.
metric_folder : string
Path to the input dti metric or/and peak files. It will be used as
metric for statistical analysis of bundles.
group : string
what group subject belongs to e.g. control or patient
subject : string
subject id e.g. 10001
no_disks : integer, optional
Number of disks used for dividing bundle into disks. (Default 100)
out_dir : string, optional
Output directory (default input file directory)
References
----------
.. [Chandio19] Chandio, B.Q., S. Koudoro, D. Reagan, J. Harezlak,
E. Garyfallidis, Bundle Analytics: a computational and statistical
analyses framework for tractometric studies, Proceedings of:
International Society of Magnetic Resonance in Medicine (ISMRM),
Montreal, Canada, 2019.
"""
dt = dict()
mb = os.listdir(model_bundle_folder)
mb.sort()
bd = os.listdir(bundle_folder)
bd.sort()
org_bd = os.listdir(orig_bundle_folder)
org_bd.sort()
n = len(org_bd)
for io in range(n):
mbundles, _ = load_trk(os.path.join(model_bundle_folder, mb[io]))
bundles, _ = load_trk(os.path.join(bundle_folder, bd[io]))
orig_bundles, _ = load_trk(os.path.join(orig_bundle_folder,
org_bd[io]))
mbundle_streamlines = set_number_of_points(mbundles,
nb_points=no_disks)
metric = AveragePointwiseEuclideanMetric()
qb = QuickBundles(threshold=25., metric=metric)
clusters = qb.cluster(mbundle_streamlines)
centroids = Streamlines(clusters.centroids)
print('Number of centroids ', len(centroids.data))
print('Model bundle ', mb[io])
print('Number of streamlines in bundle in common space ',
len(bundles))
print('Number of streamlines in bundle in original space ',
len(orig_bundles))
_, indx = cKDTree(centroids.data, 1,
copy_data=True).query(bundles.data, k=1)
metric_files_names = os.listdir(metric_folder)
_, affine = load_nifti(os.path.join(metric_folder, "fa.nii.gz"))
affine_r = np.linalg.inv(affine)
transformed_orig_bundles = transform_streamlines(orig_bundles,
affine_r)
for mn in range(0, len(metric_files_names)):
ind = np.array(indx)
fm = metric_files_names[mn][:2]
bm = mb[io][:-4]
dt = dict()
metric_name = os.path.join(metric_folder,
metric_files_names[mn])
if metric_files_names[mn][2:] == '.nii.gz':
metric, _ = load_nifti(metric_name)
dti_measures(transformed_orig_bundles, metric, dt, fm,
bm, subject, group, ind, out_dir)
else:
fm = metric_files_names[mn][:3]
metric = load_peaks(metric_name)
peak_values(bundles, metric, dt, fm, bm, subject, group,
ind, out_dir)
def fiber_simple_3d_show_advanced(img,
streamlines,
colors=None,
linewidth=1,
s='png',
imgcolor=False):
streamlines = streamlines
data = img.get_data()
shape = img.shape
affine = img.affine
"""
With our current design it is easy to decide in which space you want the
streamlines and slices to appear. The default we have here is to appear in
world coordinates (RAS 1mm).
"""
world_coords = True
"""
If we want to see the objects in native space we need to make sure that all
objects which are currently in world coordinates are transformed back to
native space using the inverse of the affine.
"""
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(affine))
"""
Now we create, a ``Renderer`` object and add the streamlines using the ``line``
function and an image plane using the ``slice`` function.
"""
ren = window.Renderer()
stream_actor = actor.line(streamlines, colors=colors, linewidth=linewidth)
"""img colormap"""
if imgcolor:
lut = actor.colormap_lookup_table(scale_range=(0, 1),
hue_range=(0, 1.),
saturation_range=(0., 1.),
value_range=(0., 1.))
else:
lut = None
if not world_coords:
image_actor_z = actor.slicer(data,
affine=np.eye(4),
lookup_colormap=lut)
else:
image_actor_z = actor.slicer(data, affine, lookup_colormap=lut)
"""
We can also change also the opacity of the slicer.
"""
slicer_opacity = 0.6
image_actor_z.opacity(slicer_opacity)
"""
We can add additonal slicers by copying the original and adjusting the
``display_extent``.
"""
image_actor_x = image_actor_z.copy()
image_actor_x.opacity(slicer_opacity)
x_midpoint = int(np.round(shape[0] / 2))
image_actor_x.display_extent(x_midpoint, x_midpoint, 0, shape[1] - 1, 0,
shape[2] - 1)
image_actor_y = image_actor_z.copy()
image_actor_y.opacity(slicer_opacity)
y_midpoint = int(np.round(shape[1] / 2))
image_actor_y.display_extent(0, shape[0] - 1, y_midpoint, y_midpoint, 0,
shape[2] - 1)
"""
Connect the actors with the Renderer.
"""
ren.add(stream_actor)
ren.add(image_actor_z)
ren.add(image_actor_x)
ren.add(image_actor_y)
"""
Now we would like to change the position of each ``image_actor`` using a
slider. The sliders are widgets which require access to different areas of the
visualization pipeline and therefore we don't recommend using them with
``show``. The more appropriate way is to use them with the ``ShowManager``
object which allows accessing the pipeline in different areas. Here is how:
"""
show_m = window.ShowManager(ren, size=(1200, 900))
show_m.initialize()
"""
After we have initialized the ``ShowManager`` we can go ahead and create
sliders to move the slices and change their opacity.
"""
line_slider_z = ui.LineSlider2D(min_value=0,
max_value=shape[2] - 1,
initial_value=shape[2] / 2,
text_template="{value:.0f}",
length=140)
line_slider_x = ui.LineSlider2D(min_value=0,
max_value=shape[0] - 1,
initial_value=shape[0] / 2,
text_template="{value:.0f}",
length=140)
line_slider_y = ui.LineSlider2D(min_value=0,
max_value=shape[1] - 1,
initial_value=shape[1] / 2,
text_template="{value:.0f}",
length=140)
opacity_slider = ui.LineSlider2D(min_value=0.0,
max_value=1.0,
initial_value=slicer_opacity,
length=140)
"""
Now we will write callbacks for the sliders and register them.
"""
def change_slice_z(i_ren, obj, slider):
z = int(np.round(slider.value))
image_actor_z.display_extent(0, shape[0] - 1, 0, shape[1] - 1, z, z)
def change_slice_x(i_ren, obj, slider):
x = int(np.round(slider.value))
image_actor_x.display_extent(x, x, 0, shape[1] - 1, 0, shape[2] - 1)
def change_slice_y(i_ren, obj, slider):
y = int(np.round(slider.value))
image_actor_y.display_extent(0, shape[0] - 1, y, y, 0, shape[2] - 1)
def change_opacity(i_ren, obj, slider):
slicer_opacity = slider.value
image_actor_z.opacity(slicer_opacity)
image_actor_x.opacity(slicer_opacity)
image_actor_y.opacity(slicer_opacity)
line_slider_z.add_callback(line_slider_z.slider_disk, "MouseMoveEvent",
change_slice_z)
line_slider_x.add_callback(line_slider_x.slider_disk, "MouseMoveEvent",
change_slice_x)
line_slider_y.add_callback(line_slider_y.slider_disk, "MouseMoveEvent",
change_slice_y)
opacity_slider.add_callback(opacity_slider.slider_disk, "MouseMoveEvent",
change_opacity)
"""
We'll also create text labels to identify the sliders.
"""
def build_label(text):
label = ui.TextBlock2D()
label.message = text
label.font_size = 18
label.font_family = 'Arial'
label.justification = 'left'
label.bold = False
label.italic = False
label.shadow = False
# label.actor.GetTextProperty().SetBackgroundColor(0, 0, 0)
# label.actor.GetTextProperty().SetBackgroundOpacity(0.0)
label.color = (1, 1, 1)
return label
line_slider_label_z = build_label(text="Z Slice")
line_slider_label_x = build_label(text="X Slice")
line_slider_label_y = build_label(text="Y Slice")
opacity_slider_label = build_label(text="Opacity")
"""
Now we will create a ``panel`` to contain the sliders and labels.
"""
panel = ui.Panel2D(center=(1030, 120),
size=(300, 200),
color=(1, 1, 1),
opacity=0.1,
align="right")
panel.add_element(line_slider_label_x, 'relative', (0.1, 0.75))
panel.add_element(line_slider_x, 'relative', (0.65, 0.8))
panel.add_element(line_slider_label_y, 'relative', (0.1, 0.55))
panel.add_element(line_slider_y, 'relative', (0.65, 0.6))
panel.add_element(line_slider_label_z, 'relative', (0.1, 0.35))
panel.add_element(line_slider_z, 'relative', (0.65, 0.4))
panel.add_element(opacity_slider_label, 'relative', (0.1, 0.15))
panel.add_element(opacity_slider, 'relative', (0.65, 0.2))
show_m.ren.add(panel)
"""
Then, we can render all the widgets and everything else in the screen and
start the interaction using ``show_m.start()``.
However, if you change the window size, the panel will not update its position
properly. The solution to this issue is to update the position of the panel
using its ``re_align`` method every time the window size changes.
"""
global size
size = ren.GetSize()
def win_callback(obj, event):
global size
if size != obj.GetSize():
size_old = size
size = obj.GetSize()
size_change = [size[0] - size_old[0], 0]
panel.re_align(size_change)
show_m.initialize()
"""
Finally, please set the following variable to ``True`` to interact with the
datasets in 3D.
"""
interactive = True #False
ren.zoom(1.5)
ren.reset_clipping_range()
if interactive:
show_m.add_window_callback(win_callback)
show_m.render()
show_m.start()
else:
window.record(
ren,
out_path=
'/home/brain/workingdir/data/dwi/hcp/preprocessed/response_dhollander/'
'100408/result/result20vs45/cc_clustering_png1/100408lr15_%s.png' %
s,
size=(1200, 900),
reset_camera=False)
"""
.. figure:: bundles_and_3_slices.png
:align: center
A few bundles with interactive slicing.
"""
del show_m
"""
def buan_bundle_profiles(model_bundle_folder,
bundle_folder,
orig_bundle_folder,
metric_folder,
group_id,
subject,
no_disks=100,
out_dir=''):
"""
Applies statistical analysis on bundles and saves the results
in a directory specified by ``out_dir``.
Parameters
----------
model_bundle_folder : string
Path to the input model bundle files. This path may contain
wildcards to process multiple inputs at once.
bundle_folder : string
Path to the input bundle files in common space. This path may
contain wildcards to process multiple inputs at once.
orig_folder : string
Path to the input bundle files in native space. This path may
contain wildcards to process multiple inputs at once.
metric_folder : string
Path to the input dti metric or/and peak files. It will be used as
metric for statistical analysis of bundles.
group_id : integer
what group subject belongs to either 0 for control or 1 for patient
subject : string
subject id e.g. 10001
no_disks : integer, optional
Number of disks used for dividing bundle into disks. (Default 100)
out_dir : string, optional
Output directory (default input file directory)
References
----------
.. [Chandio2020] Chandio, B.Q., Risacher, S.L., Pestilli, F., Bullock, D.,
Yeh, FC., Koudoro, S., Rokem, A., Harezlack, J., and Garyfallidis, E.
Bundle analytics, a computational framework for investigating the
shapes and profiles of brain pathways across populations.
Sci Rep 10, 17149 (2020)
"""
t = time()
dt = dict()
mb = glob(os.path.join(model_bundle_folder, "*.trk"))
print(mb)
mb.sort()
bd = glob(os.path.join(bundle_folder, "*.trk"))
bd.sort()
print(bd)
org_bd = glob(os.path.join(orig_bundle_folder, "*.trk"))
org_bd.sort()
print(org_bd)
n = len(org_bd)
n = len(mb)
for io in range(n):
mbundles = load_tractogram(mb[io],
reference='same',
bbox_valid_check=False).streamlines
bundles = load_tractogram(bd[io],
reference='same',
bbox_valid_check=False).streamlines
orig_bundles = load_tractogram(org_bd[io],
reference='same',
bbox_valid_check=False).streamlines
if len(orig_bundles) > 5:
indx = assignment_map(bundles, mbundles, no_disks)
ind = np.array(indx)
metric_files_names_dti = glob(
os.path.join(metric_folder, "*.nii.gz"))
metric_files_names_csa = glob(os.path.join(metric_folder,
"*.pam5"))
_, affine = load_nifti(metric_files_names_dti[0])
affine_r = np.linalg.inv(affine)
transformed_orig_bundles = transform_streamlines(
orig_bundles, affine_r)
for mn in range(len(metric_files_names_dti)):
ab = os.path.split(metric_files_names_dti[mn])
metric_name = ab[1]
fm = metric_name[:-7]
bm = os.path.split(mb[io])[1][:-4]
logging.info("bm = " + bm)
dt = dict()
logging.info("metric = " + metric_files_names_dti[mn])
metric, _ = load_nifti(metric_files_names_dti[mn])
anatomical_measures(transformed_orig_bundles, metric, dt, fm,
bm, subject, group_id, ind, out_dir)
for mn in range(len(metric_files_names_csa)):
ab = os.path.split(metric_files_names_csa[mn])
metric_name = ab[1]
fm = metric_name[:-5]
bm = os.path.split(mb[io])[1][:-4]
logging.info("bm = " + bm)
logging.info("metric = " + metric_files_names_csa[mn])
dt = dict()
metric = load_peaks(metric_files_names_csa[mn])
peak_values(transformed_orig_bundles, metric, dt, fm, bm,
subject, group_id, ind, out_dir)
print("total time taken in minutes = ", (-t + time()) / 60)
def _register_model_to_neighb(self,
slr_num_thread=1,
select_model=1000,
select_target=1000,
slr_transform_type='scaling'):
"""
Parameters
----------
slr_num_thread : int
Number of threads for SLR.
Should remain 1 for nearly all use-case.
select_model : int
Maximum number of clusters to select from the model.
select_target : int
Maximum number of clusters to select from the neighborhood.
slr_transform_type : str
Define the transformation for the local SLR.
[translation, rigid, similarity, scaling].
Returns
-------
transf_neighbor : list
The neighborhood clusters transformed into model space.
"""
possible_slr_transform_type = {
'translation': 0,
'rigid': 1,
'similarity': 2,
'scaling': 3
}
static = select_random_set_of_streamlines(self.model_centroids,
select_model, self.rng)
moving = select_random_set_of_streamlines(self.neighb_centroids,
select_target, self.rng)
# Tuple 0,1,2 are the min & max bound in x,y,z for translation
# Tuple 3,4,5 are the min & max bound in x,y,z for rotation
# Tuple 6,7,8 are the min & max bound in x,y,z for scaling
# For uniform scaling (similarity), tuple #6 is enough
bounds_dof = [(-20, 20), (-20, 20), (-20, 20), (-10, 10), (-10, 10),
(-10, 10), (0.8, 1.2), (0.8, 1.2), (0.8, 1.2)]
metric = BundleMinDistanceMetric(num_threads=slr_num_thread)
slr_transform_type_id = possible_slr_transform_type[slr_transform_type]
if slr_transform_type_id >= 0:
init_transfo_dof = np.zeros(3)
slr = StreamlineLinearRegistration(metric=metric,
method="Powell",
x0=init_transfo_dof,
bounds=bounds_dof[:3],
num_threads=slr_num_thread)
slm = slr.optimize(static, moving)
if slr_transform_type_id >= 1:
init_transfo_dof = np.zeros(6)
init_transfo_dof[:3] = slm.xopt
slr = StreamlineLinearRegistration(metric=metric,
x0=init_transfo_dof,
bounds=bounds_dof[:6],
num_threads=slr_num_thread)
slm = slr.optimize(static, moving)
if slr_transform_type_id >= 2:
if slr_transform_type_id == 2:
init_transfo_dof = np.zeros(7)
init_transfo_dof[:6] = slm.xopt
init_transfo_dof[6] = 1.
slr = StreamlineLinearRegistration(metric=metric,
x0=init_transfo_dof,
bounds=bounds_dof[:7],
num_threads=slr_num_thread)
slm = slr.optimize(static, moving)
else:
init_transfo_dof = np.zeros(9)
init_transfo_dof[:6] = slm.xopt[:6]
init_transfo_dof[6:] = np.array((slm.xopt[6], ) * 3)
slr = StreamlineLinearRegistration(metric=metric,
x0=init_transfo_dof,
bounds=bounds_dof[:9],
num_threads=slr_num_thread)
slm = slr.optimize(static, moving)
self.model_centroids = transform_streamlines(self.model_centroids,
np.linalg.inv(slm.matrix))
def show_results(streamlines, vol, affine, world_coords=True, opacity=0.6):
from dipy.viz import actor, window, widget
import numpy as np
shape = vol.shape
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(affine))
ren = window.Renderer()
if streamlines is not None:
stream_actor = actor.line(streamlines)
if not world_coords:
image_actor = actor.slicer(vol, affine=np.eye(4))
else:
image_actor = actor.slicer(vol, affine)
slicer_opacity = opacity #.6
image_actor.opacity(slicer_opacity)
if streamlines is not None:
ren.add(stream_actor)
ren.add(image_actor)
show_m = window.ShowManager(ren, size=(1200, 900))
show_m.initialize()
def change_slice(obj, event):
z = int(np.round(obj.get_value()))
image_actor.display_extent(0, shape[0] - 1,
0, shape[1] - 1, z, z)
slider = widget.slider(show_m.iren, show_m.ren,
callback=change_slice,
min_value=0,
max_value=shape[2] - 1,
value=shape[2] / 2,
label="Move slice",
right_normalized_pos=(.98, 0.6),
size=(120, 0), label_format="%0.lf",
color=(1., 1., 1.),
selected_color=(0.86, 0.33, 1.))
global size
size = ren.GetSize()
def win_callback(obj, event):
global size
if size != obj.GetSize():
slider.place(ren)
size = obj.GetSize()
show_m.initialize()
show_m.add_window_callback(win_callback)
show_m.render()
show_m.start()
# ren.zoom(1.5)
# ren.reset_clipping_range()
# window.record(ren, out_path='bundles_and_a_slice.png', size=(1200, 900),
# reset_camera=False)
del show_m
def fiber_simple_3d_show(img, streamlines, world_coords=True, slicer_opacity=0.6):
if not world_coords:
from dipy.tracking.streamline import transform_streamlines
streamlines = transform_streamlines(streamlines, np.linalg.inv(img.affine))
# Renderer
ren = window.Renderer()
stream_actor = actor.line(streamlines)
if not world_coords:
image_actor = actor.slicer(img.get_data(), affine=np.eye(4))
else:
image_actor = actor.slicer(img.get_data(), img.affine)
# opacity
image_actor.opacity(slicer_opacity)
# add some slice
image_actor2 = image_actor.copy()
image_actor2.opacity(slicer_opacity)
# image_actor2.display()
image_actor2.display(None, image_actor2.shape[1] / 2, None)
image_actor3 = image_actor.copy()
image_actor3.opacity(slicer_opacity)
# image_actor3.display()
image_actor3.display(image_actor3.shape[0] / 2, None, None)
# connect the actors with the Render
ren.add(stream_actor)
ren.add(image_actor)
ren.add(image_actor2)
ren.add(image_actor3)
# initial showmanager
show_m = window.ShowManager(ren, size=(1200, 900))
show_m.initialize()
# change the position of the image_actor using a slider
def change_slice(obj, event):
z = int(np.round(obj.get_value()))
image_actor.display_extent(0, img.shape[0] - 1, 0, img.shape[1] - 1, z, z)
slicer = widget.slider(show_m.iren, show_m.ren, callback=change_slice, min_value=0, max_value=img.shape[2] - 1,
value=img.shape[2] / 2, label="Move slice",
right_normalized_pos=(.98, 0.6), size=(120, 0), label_format="%0.1f", color=(1., 1., 1.),
selected_color=(0.86, 0.33, 1.))
# change the position of the image_actor using a slider
def change_slice2(obj, event):
y = int(np.round(obj.get_value()))
image_actor2.display_extent(0, img.shape[0] - 1, y, y, 0, img.shape[2] - 1)
slicer2 = widget.slider(show_m.iren, show_m.ren, callback=change_slice2, min_value=0, max_value=img.shape[1] - 1,
value=img.shape[1] / 2, label="Coronal slice",
right_normalized_pos=(.98, 0.3), size=(120, 0), label_format="%0.1f", color=(1., 1., 1.),
selected_color=(0.86, 0.33, 1.))
# change the position of the image_actor using a slider
def change_slice3(obj, event):
x = int(np.round(obj.get_value()))
image_actor3.display_extent(x, x, 0, img.shape[1] - 1, 0, img.shape[2] - 1)
slicer3 = widget.slider(show_m.iren, show_m.ren, callback=change_slice3, min_value=0, max_value=img.shape[0] - 1,
value=img.shape[0] / 2, label="Sagittal slice",
right_normalized_pos=(.98, 0.9), size=(120, 0), label_format="%0.1f", color=(1., 1., 1.),
selected_color=(0.86, 0.33, 1.))
# change window size, the slider will change
global size
size = ren.GetSize()
def win_callback(obj, event):
global size
if size != obj.GetSize():
slicer.place(ren)
slicer2.place(ren)
slicer3.place(ren)
size = obj.GetSize()
show_m.initialize()
# interact with the available 3D and 2D objects
show_m.add_window_callback(win_callback)
show_m.render()
show_m.start()
ren.zoom(1.5)
ren.reset_clipping_range()
window.record(ren, out_path='/home/brain/workingdir/pyfat/pyfat/example/test_results/cc_clusters_test.png', size=(1200, 900), reset_camera=False)
del show_m