def build_coord_list(coords, dwi_dir):
from nilearn import masking
try:
import cPickle as pickle
except ImportError:
import _pickle as pickle
nodif_brain_mask_path = "%s%s" % (dwi_dir, '/nodif_brain_mask.nii.gz')
x_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[0]
y_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[1]
z_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
# Convert coords back to voxels
coords_vox = []
for coord in coords:
coords_vox.append(mmToVox(coord))
coords = list(tuple(x) for x in coords_vox)
coord_num = len(coords)
return coords, coord_num
def coord_masker(mask, coords, label_names, error):
from nilearn import masking
x_vox = np.diagonal(masking._load_mask_img(mask)[1][:3, 0:3])[0]
y_vox = np.diagonal(masking._load_mask_img(mask)[1][:3, 0:3])[1]
z_vox = np.diagonal(masking._load_mask_img(mask)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
mask_data, _ = masking._load_mask_img(mask)
# mask_coords = list(zip(*np.where(mask_data == True)))
coords_vox = []
for i in coords:
coords_vox.append(mmToVox(i))
coords_vox = list(tuple(x) for x in coords_vox)
bad_coords = []
for coord in coords_vox:
sphere_vol = np.zeros(mask_data.shape, dtype=bool)
sphere_vol[tuple(coord)] = 1
if (mask_data & sphere_vol).any():
print("%s%s" % (coord, ' falls within mask...'))
continue
inds = get_sphere(coord, error, (np.abs(x_vox), y_vox, z_vox),
mask_data.shape)
sphere_vol[tuple(inds.T)] = 1
if (mask_data & sphere_vol).any():
print("%s%s%.2f%s" % (coord, ' is within a + or - ', float(error),
' mm neighborhood...'))
continue
bad_coords.append(coord)
bad_coords = [x for x in bad_coords if x is not None]
indices = []
for bad_coord in bad_coords:
indices.append(coords_vox.index(bad_coord))
label_names = list(label_names)
coords = list(tuple(x) for x in coords)
for ix in sorted(indices, reverse=True):
print("%s%s%s%s" % ('Removing: ', label_names[ix], ' at ', coords[ix]))
label_names.pop(ix)
coords.pop(ix)
return coords, label_names
def inverse_transform(self, X, y=None, **kwargs):
"""
Reconstruct image from transformed data.
:param X: data
:param y: targets
:param kwargs:
:return:
"""
X = np.asarray(X)
# get ROI masks
atlas_obj = AtlasLibrary().get_atlas(self.atlas_name, self.affine, self.shape, self.mask_threshold)
roi_objects = self._get_rois(atlas_obj, which_rois=self.rois, background_id=self.background_id)
unmasked = np.squeeze(np.zeros_like(atlas_obj.map, dtype='float32'))
for i, roi in enumerate(roi_objects):
mask, mask_affine = masking._load_mask_img(roi.mask)
mask_img = image.new_img_like(roi.mask, mask, mask_affine)
mask_data = _utils.as_ndarray(mask_img.get_fdata(), dtype=np.bool)
if self.collection_mode == 'list':
unmasked[mask_data] = X[i]
else:
unmasked[mask_data] = X[self.mask_indices == i]
new_image = image.new_img_like(atlas_obj.atlas, unmasked)
return new_image
def make_searchlight_masks(self):
# Compute world coordinates of all in-mask voxels.
# Return indices as sparse matrix of 0's and 1's
print("start get coords")
world_process_mask = self.data.nifti_masker.fit_transform(self.process_mask)
world_brain_mask = self.data.nifti_masker.fit_transform(self.data.mask)
process_mask_1D = world_brain_mask.copy()
process_mask_1D[:,:] = 0
no_overlap = np.where( world_process_mask * world_brain_mask > 0 ) #get the indices where at least one entry is 0
process_mask_1D[no_overlap] = 1 #delete entries for which there is no overlap
mask, mask_affine = masking._load_mask_img(self.data.mask)
mask_coords = np.where(mask != 0)
mc1 = np.reshape(mask_coords[0], (1, -1))
mc2 = np.reshape(mask_coords[1], (1, -1))
mc3 = np.reshape(mask_coords[2], (1, -1))
mask_coords = np.concatenate((mc1.T,mc2.T, mc3.T), axis = 1)
selected_3D = self.data.nifti_masker.inverse_transform( process_mask_1D )
process_mask_coords = np.where(selected_3D.get_data()[:,:,:,0] != 0)
pmc1 = np.reshape(process_mask_coords[0], (1, -1))
pmc2 = np.reshape(process_mask_coords[1], (1, -1))
pmc3 = np.reshape(process_mask_coords[2], (1, -1))
process_mask_coords = np.concatenate((pmc1.T,pmc2.T, pmc3.T), axis = 1)
clf = neighbors.NearestNeighbors(radius = 3)
A = clf.fit(mask_coords).radius_neighbors_graph(process_mask_coords)
del mask_coords, process_mask_coords, selected_3D, no_overlap
print("Built searchlight masks.")
print("Each searchlight has on the order of " + str( sum(sum(A[0].toarray())) ) + " voxels")
self.A = A.tolil()
self.process_mask_1D = process_mask_1D
def coord_masker(mask, coords, label_names):
x_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[0]
y_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[1]
z_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['','','']
voxcoords[0] = int((round(int(mmcoords[0])/x_vox))+45)
voxcoords[1] = int((round(int(mmcoords[1])/y_vox))+63)
voxcoords[2] = int((round(int(mmcoords[2])/z_vox))+36)
return voxcoords
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data == True)))
coords_vox = []
for i in coords:
coords_vox.append(mmToVox(i))
coords_vox = list(tuple(x) for x in coords_vox)
bad_coords = []
error=8
for coord in coords_vox:
sphere_vol = np.zeros(mask_data.shape, dtype=bool)
sphere_vol[tuple(coord)] = 1
if (mask_data & sphere_vol).any():
print(str(coord) + ' falls within mask...')
continue
inds = get_sphere(coord, error, (np.abs(x_vox), y_vox, z_vox), mask_data.shape)
sphere_vol[tuple(inds.T)] = 1
if (mask_data & sphere_vol).any():
print(str(coord) + ' is within a + or - ' + str(error) + ' voxel neighborhood...')
continue
bad_coords.append(coord)
bad_coords = [x for x in bad_coords if x is not None]
indices=[]
for bad_coord in bad_coords:
indices.append(coords_vox.index(bad_coord))
for ix in sorted(indices, reverse=True):
print('Removing: ' + str(label_names[ix]) + ' at ' + str(coords[ix]))
del label_names[ix]
del coords[ix]
return(coords, label_names)
def apply_mask_and_get_affinity(seeds,
niimg,
radius,
allow_overlap,
n_jobs=1,
mask_img=None):
import time
start = time.time()
seeds = list(seeds)
affine = niimg.affine
# Compute world coordinates of all in-mask voxels.
mask_img = check_niimg_3d(mask_img)
mask_img = image.resample_img(mask_img,
target_affine=affine,
target_shape=niimg.shape[:3],
interpolation='nearest')
mask, _ = masking._load_mask_img(mask_img)
mask_coords = list(zip(*np.where(mask != 0)))
X = masking._apply_mask_fmri(niimg, mask_img)
# For each seed, get coordinates of nearest voxel
nearests = joblib.Parallel(n_jobs=n_jobs)(
joblib.delayed(seed_nearest)(seed_chunk, affine, mask_coords)
for thread_id, seed_chunk in enumerate(np.array_split(seeds, n_jobs)))
nearests = [i for j in nearests for i in j]
mask_coords = np.asarray(list(zip(*mask_coords)))
mask_coords = coord_transform(mask_coords[0], mask_coords[1],
mask_coords[2], affine)
mask_coords = np.asarray(mask_coords).T
clf = neighbors.NearestNeighbors(radius=radius)
A = clf.fit(mask_coords).radius_neighbors_graph(seeds)
A = A.tolil()
for i, nearest in enumerate(nearests):
if nearest is None:
continue
A[i, nearest] = True
# Include the voxel containing the seed itself if not masked
mask_coords = mask_coords.astype(int).tolist()
for i, seed in enumerate(seeds):
try:
A[i, mask_coords.index(seed)] = True
except ValueError:
# seed is not in the mask
pass
if not allow_overlap:
if np.any(A.sum(axis=0) >= 2):
raise ValueError('Overlap detected between spheres')
return X, A
def coord_masker(mask, coords, label_names):
x_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[0]
y_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[1]
z_vox = np.diagonal(masking._load_mask_img(mask)[1][:3,0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['','','']
voxcoords[0] = int((round(int(mmcoords[0])/x_vox))+45)
voxcoords[1] = int((round(int(mmcoords[1])/y_vox))+63)
voxcoords[2] = int((round(int(mmcoords[2])/z_vox))+36)
return voxcoords
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data == True)))
coords_vox = []
for i in coords:
coords_vox.append(mmToVox(i))
coords_vox = list(tuple(x) for x in coords_vox)
bad_coords = []
for coord in coords_vox:
bad_coord = check_neighborhood(coord, mask_coords)
bad_coords.append(bad_coord)
bad_coords = [x for x in bad_coords if x is not None]
#if __name__ == '__main__':
#number_processes = (multiprocessing.cpu_count())
#pool = multiprocessing.Pool(int(number_processes))
#coord = coords_vox
#result = pool.map_async(check_neighborhood, coord)
#pool.close()
#pool.join()
#bad_coords = [x for x in result.get() if x is not None]
indices=[]
for bad_coord in bad_coords:
indices.append(coords_vox.index(bad_coord))
for ix in sorted(indices, reverse=True):
print('Removing: ' + str(label_names[ix]) + ' at ' + str(coords[ix]))
del label_names[ix]
del coords[ix]
return(coords, label_names)
def apply_mask(self, series, mask_img):
"""
Apply mask on series.
:param series: np.ndarray, data working on
:param mask_img:
:return:
"""
mask_img = _utils.check_niimg_3d(mask_img)
mask, mask_affine = masking._load_mask_img(mask_img)
mask_img = image.new_img_like(mask_img, mask, mask_affine)
mask_data = _utils.as_ndarray(mask_img.get_fdata(),
dtype=np.bool)
return series[mask_data].T
def parcel_masker(mask, coords, parcel_list, label_names, dir_path, ID):
from pynets import nodemaker
from nilearn.image import resample_img
from nilearn import masking
##For parcel masking, specify overlap thresh and error cushion in mm voxels
perc_overlap = 0.75 ##Default is >=90% overlap
mask_img = nib.load(mask)
mask_data, _ = masking._load_mask_img(mask)
i = 0
indices = []
for parcel in parcel_list:
parcel_vol = np.zeros(mask_data.shape, dtype=bool)
parcel_data_reshaped = resample_img(parcel, target_affine=mask_img.affine,
target_shape=mask_data.shape).get_data()
parcel_vol[parcel_data_reshaped==1] = 1
##Count number of unique voxels where overlap of parcel and mask occurs
overlap_count = len(np.unique(np.where((mask_data.astype('uint8')==1) & (parcel_vol.astype('uint8')==1))))
##Count number of total unique voxels within the parcel
total_count = len(np.unique(np.where(((parcel_vol.astype('uint8')==1)))))
##Calculate % overlap
try:
overlap = float(overlap_count/total_count)
except:
overlap = float(0)
if overlap >= perc_overlap:
print(str(round(100*overlap,1)) + '% of parcel ' + str(label_names[i]) + ' falls within mask...')
else:
indices.append(i)
i = i + 1
label_names_adj=list(label_names)
coords_adj = list(tuple(x) for x in coords)
parcel_list_adj = parcel_list
for ix in sorted(indices, reverse=True):
print('Removing: ' + str(label_names_adj[ix]) + ' at ' + str(coords_adj[ix]))
label_names_adj.pop(ix)
coords_adj.pop(ix)
parcel_list_adj.pop(ix)
##Create a resampled 3D atlas that can be viewed alongside mask img for QA
resampled_parcels_nii_path = dir_path + '/' + ID + '_parcels_resampled2mask_' + str(os.path.basename(mask).split('.')[0]) + '.nii.gz'
resampled_parcels_atlas, _ = nodemaker.create_parcel_atlas(parcel_list_adj)
resampled_parcels_map_nifti = resample_img(resampled_parcels_atlas, target_affine=mask_img.affine, target_shape=mask_data.shape)
nib.save(resampled_parcels_map_nifti, resampled_parcels_nii_path)
return(coords_adj, label_names_adj, parcel_list_adj)
def fit(self, imgs, y, y_mask=None, groups=None, X=None, A=None):
# check if image is 4D
imgs = check_niimg_4d(imgs)
# Get the seeds
process_mask_img = self.process_mask_img
if self.process_mask_img is None:
process_mask_img = self.mask_img
# Compute world coordinates of the seeds
process_mask, process_mask_affine = masking._load_mask_img(
process_mask_img)
process_mask_coords = np.where(process_mask != 0)
process_mask_coords = coord_transform(process_mask_coords[0],
process_mask_coords[1],
process_mask_coords[2],
process_mask_affine)
process_mask_coords = np.asarray(process_mask_coords).T
import time
start = time.time()
print("GETTING SEARCHLIGHT SPHERES")
X, A = apply_mask_and_get_affinity(process_mask_coords,
imgs,
self.radius,
True,
mask_img=self.mask_img,
n_jobs=self.n_jobs)
self.X = X
self.A = A
self.y = y
self.process_mask = process_mask
elapsed = time.time() - start
print(elapsed)
print("FITTING")
scores = search_light_rsa(X, y, None, A, y_mask, self.n_jobs,
self.verbose)
scores_3D = np.zeros((process_mask.shape) + (len(y), ))
for i in range(len(y)):
scores_3D[process_mask, i] = scores[:, i]
self.scores_ = scores_3D
return self
def fit(self, imgs, y, groups=None):
"""Fit the spatiotemporal searchlight
Parameters
----------
imgs : Niimg-like object
See http://nilearn.github.io/manipulating_images/input_output.html
Use 5D image. [x voxels, y voxels, z voxels, trials, time series of each trials]
y : 1D array-like
Target variable to predict. Must have exactly as many elements as trials in imgs.
groups : array-like, optional
group label for each sample for cross validation. Must have
exactly as many elements as trials in imgs. default None
NOTE: will have no effect for scikit learn < 0.18 (as nilearn says)
"""
# check if image is 5D, simply.
if len(imgs.shape) != 5:
raise ValueError('This SpatioTemporalSearhcLight instance needs 5D image.')
# Get the seeds
process_mask_img = self.mask_img
# Compute world coordinates of the seeds
process_mask, process_mask_affine = masking._load_mask_img(process_mask_img)
process_mask_coords = np.where(process_mask != 0)
process_mask_coords = coord_transform(
process_mask_coords[0], process_mask_coords[1],
process_mask_coords[2], process_mask_affine)
process_mask_coords = np.asarray(process_mask_coords).T
X, A = _apply_mask_and_get_affinity(
process_mask_coords, imgs, self.radius, True,
mask_img=self.mask_img)
# Run Searchlight
scores = self._search_light(X, y, A, groups=groups)
scores_3D = np.zeros(process_mask.shape)
scores_3D[process_mask] = scores
self.scores_ = scores_3D
return self
def make_searchlight_masks(self):
''' Compute world coordinates of all in-mask voxels.
Returns a list of masks, one mask for each searchlight. For a whole brain,
this will generate thousands of masks. Returns masks in lil format
(efficient for storing sparse matrices)'''
# Compute world coordinates of all in-mask voxels.
# Return indices as sparse matrix of 0's and 1's
print("start get coords")
world_process_mask = self.data.nifti_masker.fit_transform(
self.process_mask)
world_brain_mask = self.data.nifti_masker.fit_transform(self.data.mask)
process_mask_1D = world_brain_mask.copy()
process_mask_1D[:, :] = 0
no_overlap = np.where(
world_process_mask * world_brain_mask >
0) #get the indices where at least one entry is 0
process_mask_1D[
no_overlap] = 1 #delete entries for which there is no overlap
mask, mask_affine = masking._load_mask_img(self.data.mask)
mask_coords = np.where(mask != 0)
mc1 = np.reshape(mask_coords[0], (1, -1))
mc2 = np.reshape(mask_coords[1], (1, -1))
mc3 = np.reshape(mask_coords[2], (1, -1))
mask_coords = np.concatenate((mc1.T, mc2.T, mc3.T), axis=1)
selected_3D = self.data.nifti_masker.inverse_transform(process_mask_1D)
process_mask_coords = np.where(selected_3D.get_data()[:, :, :, 0] != 0)
pmc1 = np.reshape(process_mask_coords[0], (1, -1))
pmc2 = np.reshape(process_mask_coords[1], (1, -1))
pmc3 = np.reshape(process_mask_coords[2], (1, -1))
process_mask_coords = np.concatenate((pmc1.T, pmc2.T, pmc3.T), axis=1)
clf = neighbors.NearestNeighbors(radius=3)
A = clf.fit(mask_coords).radius_neighbors_graph(process_mask_coords)
del mask_coords, process_mask_coords, selected_3D, no_overlap
print("Built searchlight masks.")
print("Each searchlight has on the order of " +
str(sum(sum(A[0].toarray()))) + " voxels")
self.A = A.tolil()
self.process_mask_1D = process_mask_1D
def parcel_masker(mask, coords, parcel_list, label_names, dir_path, ID,
perc_overlap):
from pynets import nodemaker
from nilearn.image import resample_img
from nilearn import masking
mask_img = nib.load(mask)
mask_data, _ = masking._load_mask_img(mask)
i = 0
indices = []
for parcel in parcel_list:
parcel_vol = np.zeros(mask_data.shape, dtype=bool)
parcel_data_reshaped = resample_img(
parcel,
target_affine=mask_img.affine,
target_shape=mask_data.shape).get_data()
parcel_vol[parcel_data_reshaped == 1] = 1
# Count number of unique voxels where overlap of parcel and mask occurs
overlap_count = len(
np.unique(
np.where((mask_data.astype('uint8') == 1)
& (parcel_vol.astype('uint8') == 1))))
# Count number of total unique voxels within the parcel
total_count = len(
np.unique(np.where((parcel_vol.astype('uint8') == 1))))
# Calculate % overlap
try:
overlap = float(overlap_count / total_count)
except RuntimeWarning:
print('\nWarning: No overlap with mask!\n')
overlap = float(0)
if overlap >= perc_overlap:
print("%.2f%s%s%s" % (100 * overlap, '% of parcel ',
label_names[i], ' falls within mask...'))
else:
indices.append(i)
i = i + 1
label_names_adj = list(label_names)
coords_adj = list(tuple(x) for x in coords)
parcel_list_adj = parcel_list
for ix in sorted(indices, reverse=True):
print("%s%s%s%s" %
('Removing: ', label_names_adj[ix], ' at ', coords_adj[ix]))
label_names_adj.pop(ix)
coords_adj.pop(ix)
parcel_list_adj.pop(ix)
# Create a resampled 3D atlas that can be viewed alongside mask img for QA
resampled_parcels_nii_path = "%s%s%s%s%s%s" % (
dir_path, '/', ID, '_parcels_resampled2mask_',
os.path.basename(mask).split('.')[0], '.nii.gz')
resampled_parcels_atlas, _ = nodemaker.create_parcel_atlas(parcel_list_adj)
resampled_parcels_map_nifti = resample_img(resampled_parcels_atlas,
target_affine=mask_img.affine,
target_shape=mask_data.shape)
nib.save(resampled_parcels_map_nifti, resampled_parcels_nii_path)
return coords_adj, label_names_adj, parcel_list_adj
def fit(self, imgs, y):
"""Fit the searchlight
Parameters
----------
imgs : List of images
y : 1D array-like
Target variable to predict. Must have exactly as many elements as
3D images in img.
Attributes
----------
`scores_` : numpy.ndarray
search_light scores. Same shape as input parameter
process_mask_img.
"""
# Compute world coordinates of all in-mask voxels.
self.affine = nibabel.load(imgs[0]).affine if isinstance(
imgs[0], str) else imgs[0].affine
mask, mask_affine = masking._load_mask_img(self.mask_img)
mask_coords = np.where(mask != 0)
mask_coords = np.asarray(
mask_coords + (np.ones(len(mask_coords[0]), dtype=np.int), ))
mask_coords = np.dot(mask_affine, mask_coords)[:3].T
# Compute world coordinates of all in-process mask voxels
if self.process_mask_img is None:
process_mask = mask
process_mask_coords_world = mask_coords
else:
process_mask, process_mask_affine = \
masking._load_mask_img(self.process_mask_img)
process_mask_coords = np.where(process_mask != 0)
process_mask_coords_world = \
np.asarray(process_mask_coords
+ (np.ones(len(process_mask_coords[0]),
dtype=np.int),))
process_mask_coords_world = np.dot(process_mask_affine,
process_mask_coords_world)[:3].T
clf = neighbors.NearestNeighbors(radius=self.radius)
A = clf.fit(mask_coords).radius_neighbors_graph(
process_mask_coords_world)
if self.process_mask_img is not None:
empty_ind = [i for i in range(A.shape[0]) if A[i, :].getnnz() == 0]
if empty_ind:
warn(
'Skipping %g voxels of processing mask outside mask_img (first index: %g)'
% (len(empty_ind), empty_ind[0]))
A = A[list(set(range(A.shape[0])) - set(empty_ind)), :]
process_mask[tuple(
np.asarray(process_mask_coords)[:, empty_ind])] = False
A = A.tolil()
# scores is an 1D array of CV scores with length equals to the number
# of voxels in processing mask (columns in process_mask)
# X = masking._apply_mask_fmri(imgs, self.mask_img)
X = NiftiMasker(mask_img=self.mask_img).fit_transform(imgs)
estimator = self.estimator
if isinstance(estimator, str):
estimator = ESTIMATOR_CATALOG[estimator](**self.estimator_params)
elif hasattr(estimator,
'__name__'): # check if estimator has to be initialized
estimator = estimator(**self.estimator_params)
else:
estimator.set_params(**self.estimator_params)
scores = search_light(X, y, estimator, A, self.scoring, self.cv,
self.n_jobs, self.verbose)
scores_3D = np.zeros(process_mask.shape)
scores_3D[process_mask] = scores
self.scores_ = scores_3D
return self
def run_struct_mapping(FSLDIR, ID, bedpostx_dir, dir_path, NETWORK, coords_MNI,
node_size, atlas_select, atlas_name, label_names,
plot_switch):
edge_threshold = 0.90
connectome_fdt_thresh = 1000
####Auto-set INPUTS####
nodif_brain_mask_path = bedpostx_dir + '/nodif_brain_mask.nii.gz'
merged_th_samples_path = bedpostx_dir + '/merged_th1samples.nii.gz'
merged_f_samples_path = bedpostx_dir + '/merged_f1samples.nii.gz'
merged_ph_samples_path = bedpostx_dir + '/merged_ph1samples.nii.gz'
input_MNI = FSLDIR + '/data/standard/MNI152_T1_2mm_brain.nii.gz'
probtrackx_output_dir_path = bedpostx_dir + '/probtrackx_' + NETWORK
####Auto-set INPUTS####
##Delete any existing roi spheres
del_files_spheres = glob.glob(bedpostx_dir + '/roi_sphere*diff.nii.gz')
try:
for i in del_files_spheres:
os.remove(i)
except:
pass
##Create transform matrix between diff and MNI using FLIRT
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = merged_f_samples_path
flirt.inputs.in_file = input_MNI
flirt.inputs.out_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.run()
##Apply transform between diff and MNI using FLIRT
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = merged_f_samples_path
flirt.inputs.in_file = input_MNI
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.inputs.out_file = bedpostx_dir + '/xfms/MNI2diff_affine.nii.gz'
flirt.run()
x_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[0]
y_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[1]
z_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
##Convert coords back to voxels
coords_vox = []
for coord in coords_MNI:
coords_vox.append(mmToVox(coord))
coords = list(tuple(x) for x in coords_vox)
j = 0
for i in coords:
##Grow spheres at ROI
X = coords[j][0]
Y = coords[j][1]
Z = coords[j][2]
out_file1 = bedpostx_dir + '/roi_point_' + str(j) + '.nii.gz'
args = '-mul 0 -add 1 -roi ' + str(X) + ' 1 ' + str(Y) + ' 1 ' + str(
Z) + ' 1 0 1'
maths = fsl.ImageMaths(in_file=input_MNI,
op_string=args,
out_file=out_file1)
os.system(maths.cmdline + ' -odt float')
out_file2 = bedpostx_dir + '/roi_sphere_' + str(j) + '.nii.gz'
args = '-kernel sphere ' + str(node_size) + ' -fmean -bin'
maths = fsl.ImageMaths(in_file=out_file1,
op_string=args,
out_file=out_file2)
os.system(maths.cmdline + ' -odt float')
##Map ROIs from Standard Space to diffusion Space:
##Applying xfm and input matrix to transform ROI's between diff and MNI using FLIRT,
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = nodif_brain_mask_path
flirt.inputs.in_file = out_file2
out_file_diff = out_file2.split('.nii')[0] + '_diff.nii.gz'
flirt.inputs.out_file = out_file_diff
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.run()
j = j + 1
if not os.path.exists(probtrackx_output_dir_path):
os.makedirs(probtrackx_output_dir_path)
seed_files = glob.glob(bedpostx_dir + '/*diff.nii.gz')
seeds_text = probtrackx_output_dir_path + '/masks.txt'
try:
os.remove(seeds_text)
except OSError:
pass
seeds_file_list = []
for seed_file in seed_files:
seeds_file_list.append(seed_file)
f = open(seeds_text, 'w')
l1 = map(lambda x: x + '\n', seeds_file_list)
f.writelines(l1)
f.close()
del_files_points = glob.glob(bedpostx_dir + '/roi_point*.nii.gz')
for i in del_files_points:
os.remove(i)
del_files_spheres = glob.glob(bedpostx_dir + '/roi_sphere*[!diff].nii.gz')
for i in del_files_spheres:
os.remove(i)
mx_path = dir_path + '/' + str(ID) + '_' + NETWORK + '_structural_mx.txt'
probtrackx2 = pe.Node(interface=fsl.ProbTrackX2(), name='probtrackx2')
probtrackx2.inputs.network = True
probtrackx2.inputs.seed = seeds_text
probtrackx2.inputs.onewaycondition = True
probtrackx2.inputs.c_thresh = 0.2
probtrackx2.inputs.n_steps = 2000
probtrackx2.inputs.step_length = 0.5
probtrackx2.inputs.n_samples = 5000
probtrackx2.inputs.dist_thresh = 0.0
probtrackx2.inputs.opd = True
probtrackx2.inputs.loop_check = True
probtrackx2.inputs.omatrix1 = True
probtrackx2.overwrite = True
probtrackx2.inputs.verbose = True
probtrackx2.inputs.mask = nodif_brain_mask_path
probtrackx2.inputs.out_dir = probtrackx_output_dir_path
probtrackx2.inputs.thsamples = merged_th_samples_path
probtrackx2.inputs.fsamples = merged_f_samples_path
probtrackx2.inputs.phsamples = merged_ph_samples_path
probtrackx2.iterables = ("seed", seed_files)
try:
probtrackx2.inputs.avoid_mp = vetricular_CSF_mask_path
except:
pass
probtrackx2.run()
del (probtrackx2)
if os.path.exists(probtrackx_output_dir_path + '/fdt_network_matrix'):
mx = np.genfromtxt(probtrackx_output_dir_path + '/fdt_network_matrix')
waytotal = np.genfromtxt(probtrackx_output_dir_path + '/waytotal')
np.seterr(divide='ignore', invalid='ignore')
conn_matrix = np.divide(mx, waytotal)
conn_matrix[np.isnan(conn_matrix)] = 0
conn_matrix = np.nan_to_num(conn_matrix)
conn_matrix = normalize(conn_matrix)
##Save matrix
out_path_mx = dir_path + '/' + str(
ID) + '_' + NETWORK + '_structural_mx.txt'
np.savetxt(out_path_mx, conn_matrix, delimiter='\t')
if plot_switch == True:
rois_num = conn_matrix.shape[0]
print("Creating plot of dimensions:\n" + str(rois_num) + ' x ' +
str(rois_num))
plt.figure(figsize=(10, 10))
plt.imshow(conn_matrix,
interpolation="nearest",
vmax=1,
vmin=-1,
cmap=plt.cm.RdBu_r)
##And display the labels
plt.colorbar()
plt.title(atlas_select.upper() + ' ' + NETWORK +
' Structural Connectivity')
out_path_fig = dir_path + '/' + str(
ID) + '_' + NETWORK + '_structural_adj_mat.png'
plt.savefig(out_path_fig)
plt.close()
conn_matrix_symm = np.maximum(conn_matrix, conn_matrix.transpose())
fdt_paths_loc = probtrackx_output_dir_path + '/fdt_paths.nii.gz'
##Plotting with glass brain
##Create transform matrix between diff and MNI using FLIRT
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = input_MNI
flirt.inputs.in_file = nodif_brain_mask_path
flirt.inputs.out_matrix_file = bedpostx_dir + '/xfms/diff2MNI.mat'
flirt.run()
##Apply transform between diff and MNI using FLIRT
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = input_MNI
flirt.inputs.in_file = nodif_brain_mask_path
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/diff2MNI.mat'
flirt.inputs.out_file = bedpostx_dir + '/xfms/diff2MNI_affine.nii.gz'
flirt.run()
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = input_MNI
flirt.inputs.in_file = fdt_paths_loc
out_file_MNI = fdt_paths_loc.split('.nii')[0] + '_MNI.nii.gz'
flirt.inputs.out_file = out_file_MNI
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/diff2MNI.mat'
flirt.run()
fdt_paths_MNI_loc = probtrackx_output_dir_path + '/fdt_paths_MNI.nii.gz'
if plot_switch == True:
norm = colors.Normalize(vmin=-1, vmax=1)
clust_pal = sns.color_palette("Blues_r", 4)
clust_colors = colors.to_rgba_array(clust_pal)
connectome = plotting.plot_connectome(
conn_matrix_symm,
coords_MNI,
edge_threshold=edge_threshold,
node_color=clust_colors,
edge_cmap=plotting.cm.black_blue_r)
connectome.add_overlay(img=fdt_paths_MNI_loc,
threshold=connectome_fdt_thresh,
cmap=plotting.cm.cyan_copper_r)
out_file_path = dir_path + '/structural_connectome_fig_' + NETWORK + '_' + str(
ID) + '.png'
plt.savefig(out_file_path)
plt.close()
from pynets import plotting as pynplot
NETWORK = NETWORK + '_structural'
pynplot.plot_connectogram(conn_matrix, conn_model, atlas_name,
dir_path, ID, NETWORK, label_names)
if NETWORK != None:
est_path = dir_path + '/' + ID + '_' + NETWORK + '_structural_est.txt'
else:
est_path = dir_path + '/' + ID + '_structural_est.txt'
try:
np.savetxt(est_path, conn_matrix_symm, delimiter='\t')
except RuntimeError:
print('Diffusion network connectome failed!')
return (est_path)
def reg_coords2diff(coords, bedpostx_dir, node_size, dir_path):
try:
FSLDIR = os.environ['FSLDIR']
except NameError:
print('FSLDIR environment variable not set!')
import glob
import nipype.interfaces.fsl as fsl
import nipype.pipeline.engine as pe
from nilearn import masking
try:
import cPickle as pickle
except ImportError:
import _pickle as pickle
pick_dump = True
volumes_dir = "%s%s%s" % (dir_path, '/volumes_', str(node_size))
nodif_brain_mask_path = "%s%s" % (bedpostx_dir, '/nodif_brain_mask.nii.gz')
merged_f_samples_path = "%s%s" % (bedpostx_dir, '/merged_f1samples.nii.gz')
x_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[0]
y_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[1]
z_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
# Convert coords back to voxels
coords_vox = []
for coord in coords:
coords_vox.append(mmToVox(coord))
coords = list(tuple(x) for x in coords_vox)
j = 0
for i in coords:
# Grow spheres at ROI
X = coords[j][0]
Y = coords[j][1]
Z = coords[j][2]
out_file1 = "%s%s%s%s" % (volumes_dir, '/roi_point_', str(j),
'.nii.gz')
args = "%s%s%s%s%s%s%s" % ('-mul 0 -add 1 -roi ', str(X), ' 1 ',
str(Y), ' 1 ', str(Z), ' 1 0 1')
maths = fsl.ImageMaths(in_file=FSLDIR +
'/data/standard/MNI152_T1_1mm_brain.nii.gz',
op_string=args,
out_file=out_file1)
os.system(maths.cmdline + ' -odt float')
out_file2 = "%s%s%s%s" % (volumes_dir, '/region_', str(j), '.nii.gz')
args = "%s%s%s" % ('-kernel sphere ', str(node_size), ' -fmean -bin')
maths = fsl.ImageMaths(in_file=out_file1,
op_string=args,
out_file=out_file2)
os.system(maths.cmdline + ' -odt float')
# Map ROIs from Standard Space to diffusion Space:
# Applying xfm and input matrix to transform ROI's between diff and MNI using FLIRT,
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = merged_f_samples_path
flirt.inputs.in_file = out_file2
out_file_diff = "%s%s" % (out_file2.split('.nii')[0], '_diff.nii.gz')
flirt.inputs.out_file = out_file_diff
flirt.inputs.out_matrix_file = '/tmp/out_flirt.mat'
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = "%s%s" % (bedpostx_dir,
'/xfms/MNI2diff.mat')
flirt.run()
j = j + 1
args = '-bin'
maths = fsl.ImageMaths(in_file=out_file_diff,
op_string=args,
out_file=out_file_diff)
print('\nBinarizing custom mask...')
os.system(maths.cmdline)
del_files_points = glob.glob(volumes_dir + '/roi_point*')
if len(del_files_points) > 0:
for i in del_files_points:
os.remove(i)
spheres_list = [i for i in os.listdir(volumes_dir) if 'diff.nii.gz' in i]
if pick_dump is True:
# Save coords to pickle
coord_path = "%s%s" % (dir_path, '/coords.pkl')
with open(coord_path, 'wb') as f:
pickle.dump(coords, f, protocol=2)
return spheres_list
def get_searchlight_neighbours_matrix(mask_file, radius=6):
"""
Parameters
----------
mask_file : string
Path to mask-file.
radius : integer
Searchlight radius in mm.
Returns
-------
A : ndarray, shape(n_voxel, n_voxel)
Affinity matrix. A[i,j]==1 if voxel_i, voxel_j are neighbours
and 0 otherwise
Examples
--------
>>> A = get_searchlight_neighbours_matrix('MNI152_2mm_brain_mask.nii')
>>> A.shape
"""
# heavily borrowed from nilearn: http://nilearn.github.io/
from nilearn import image
from nilearn import masking
from nilearn.image.resampling import coord_transform
from distutils.version import LooseVersion
import sklearn
from sklearn import neighbors
from nilearn._utils.niimg_conversions import check_niimg_3d
def _apply_mask_and_get_affinity(seeds,
niimg,
radius,
allow_overlap,
mask_img=None):
seeds = list(seeds)
aff = niimg.get_affine()
# Compute world coordinates of all in-mask voxels.
if mask_img is not None:
mask_img = check_niimg_3d(mask_img)
mask_img = image.resample_img(mask_img,
target_affine=aff,
target_shape=niimg.shape[:3],
interpolation='nearest')
mask, _ = masking._load_mask_img(mask_img)
mask_coords = list(zip(*np.where(mask != 0)))
# X = masking._apply_mask_fmri(niimg, mask_img)
else:
mask_coords = list(np.ndindex(niimg.shape[:3]))
# For each seed, get coordinates of nearest voxel
nearests = []
for sx, sy, sz in seeds:
nearest = np.round(coord_transform(sx, sy, sz, np.linalg.inv(aff)))
nearest = nearest.astype(int)
nearest = (nearest[0], nearest[1], nearest[2])
try:
nearests.append(mask_coords.index(nearest))
except ValueError:
nearests.append(None)
mask_coords = np.asarray(list(zip(*mask_coords)))
mask_coords = coord_transform(mask_coords[0], mask_coords[1],
mask_coords[2], aff)
mask_coords = np.asarray(mask_coords).T
if (radius is not None
and LooseVersion(sklearn.__version__) < LooseVersion('0.16')):
# Fix for scikit learn versions below 0.16. See
# https://github.com/scikit-learn/scikit-learn/issues/4072
radius += 1e-6
clf = neighbors.NearestNeighbors(radius=radius)
A = clf.fit(mask_coords).radius_neighbors_graph(seeds)
A = A.tolil()
for i, nearest in enumerate(nearests):
if nearest is None:
continue
A[i, nearest] = True
# Include the voxel containing the seed itself if not masked
mask_coords = mask_coords.astype(int).tolist()
for i, seed in enumerate(seeds):
try:
A[i, mask_coords.index(seed)] = True
except ValueError:
# seed is not in the mask
pass
if not allow_overlap:
if np.any(A.sum(axis=0) >= 2):
raise ValueError('Overlap detected between spheres')
return A
process_mask_img = nib.load(mask_file)
# Compute world coordinates of the seeds
process_mask, process_mask_affine = masking._load_mask_img(
process_mask_img)
process_mask_coords = np.where(process_mask != 0)
process_mask_coords = coord_transform(process_mask_coords[0],
process_mask_coords[1],
process_mask_coords[2],
process_mask_affine)
process_mask_coords = np.asarray(process_mask_coords).T
A = _apply_mask_and_get_affinity(process_mask_coords,
process_mask_img,
radius,
True,
mask_img=process_mask_img)
return A # .toarray().astype('bool')
def coords_masker(roi, coords, label_names, mask, error):
from nilearn import masking
if mask and roi == mask:
error = 0
mask_data, mask_aff = masking._load_mask_img(roi)
x_vox = np.diagonal(mask_aff[:3, 0:3])[0]
y_vox = np.diagonal(mask_aff[:3, 0:3])[1]
z_vox = np.diagonal(mask_aff[:3, 0:3])[2]
def mmToVox(mask_aff, mmcoords):
return nib.affines.apply_affine(np.linalg.inv(mask_aff), mmcoords)
# mask_coords = list(zip(*np.where(mask_data == True)))
coords_vox = []
for i in coords:
coords_vox.append(mmToVox(mask_aff, i))
coords_vox = list(
tuple(map(lambda y: isinstance(y, float) and int(round(y, 0)), x))
for x in coords_vox)
bad_coords = []
for coords in coords_vox:
sphere_vol = np.zeros(mask_data.shape, dtype=bool)
sphere_vol[tuple(coords)] = 1
if (mask_data & sphere_vol).any():
print("%s%s" % (coords, ' falls within roi mask...'))
continue
inds = get_sphere(coords, error, (np.abs(x_vox), y_vox, z_vox),
mask_data.shape)
sphere_vol[tuple(inds.T)] = 1
if (mask_data & sphere_vol).any():
print("%s%s%.2f%s" % (coords, ' is within a + or - ', float(error),
' mm neighborhood...'))
continue
bad_coords.append(coords)
bad_coords = [x for x in bad_coords if x is not None]
indices = []
for bad_coords in bad_coords:
indices.append(coords_vox.index(bad_coords))
label_names = list(label_names)
coords = list(tuple(x) for x in coords_vox)
try:
for ix in sorted(indices, reverse=True):
print("%s%s%s%s" %
('Removing: ', label_names[ix], ' at ', coords[ix]))
label_names.pop(ix)
coords.pop(ix)
except RuntimeError:
print(
'ERROR: Restrictive masking. No coords remain after masking with brain mask/roi...'
)
if len(coords) <= 1:
raise ValueError(
'\nERROR: ROI mask was likely too restrictive and yielded < 2 remaining coords'
)
return coords, label_names
def reg_coords2diff(coords, bedpostx_dir, node_size):
try:
FSLDIR = os.environ['FSLDIR']
except NameError:
print('FSLDIR environment variable not set!')
import glob
import nipype.interfaces.fsl as fsl
import nipype.pipeline.engine as pe
from nilearn import masking
volumes_dir = bedpostx_dir + '/volumes'
nodif_brain_mask_path = bedpostx_dir + '/nodif_brain_mask.nii.gz'
merged_f_samples_path = bedpostx_dir + '/merged_f1samples.nii.gz'
x_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[0]
y_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[1]
z_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
##Convert coords back to voxels
coords_vox = []
for coord in coords:
coords_vox.append(mmToVox(coord))
coords = list(tuple(x) for x in coords_vox)
j = 0
for i in coords:
##Grow spheres at ROI
X = coords[j][0]
Y = coords[j][1]
Z = coords[j][2]
out_file1 = volumes_dir + '/roi_point_' + str(j) + '.nii.gz'
args = '-mul 0 -add 1 -roi ' + str(X) + ' 1 ' + str(Y) + ' 1 ' + str(
Z) + ' 1 0 1'
maths = fsl.ImageMaths(in_file=FSLDIR +
'/data/standard/MNI152_T1_1mm_brain.nii.gz',
op_string=args,
out_file=out_file1)
os.system(maths.cmdline + ' -odt float')
out_file2 = volumes_dir + '/region_' + str(j) + '.nii.gz'
args = '-kernel sphere ' + str(node_size) + ' -fmean -bin'
maths = fsl.ImageMaths(in_file=out_file1,
op_string=args,
out_file=out_file2)
os.system(maths.cmdline + ' -odt float')
##Map ROIs from Standard Space to diffusion Space:
##Applying xfm and input matrix to transform ROI's between diff and MNI using FLIRT,
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = merged_f_samples_path
flirt.inputs.in_file = out_file2
out_file_diff = out_file2.split('.nii')[0] + '_diff.nii.gz'
flirt.inputs.out_file = out_file_diff
flirt.inputs.out_matrix_file = '/tmp/out_flirt.mat'
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.run()
j = j + 1
del_files_points = glob.glob(volumes_dir + '/roi_point*')
try:
for i in del_files_points:
os.remove(i)
except:
pass
spheres_list = [i for i in os.listdir(volumes_dir) if 'diff.nii' in i]
return spheres_list
def _apply_mask_and_get_affinity(seeds,
niimg,
radius,
allow_overlap,
mask_img=None):
seeds = list(seeds)
aff = niimg.get_affine()
# Compute world coordinates of all in-mask voxels.
if mask_img is not None:
mask_img = check_niimg_3d(mask_img)
mask_img = image.resample_img(mask_img,
target_affine=aff,
target_shape=niimg.shape[:3],
interpolation='nearest')
mask, _ = masking._load_mask_img(mask_img)
mask_coords = list(zip(*np.where(mask != 0)))
# X = masking._apply_mask_fmri(niimg, mask_img)
else:
mask_coords = list(np.ndindex(niimg.shape[:3]))
# For each seed, get coordinates of nearest voxel
nearests = []
for sx, sy, sz in seeds:
nearest = np.round(coord_transform(sx, sy, sz, np.linalg.inv(aff)))
nearest = nearest.astype(int)
nearest = (nearest[0], nearest[1], nearest[2])
try:
nearests.append(mask_coords.index(nearest))
except ValueError:
nearests.append(None)
mask_coords = np.asarray(list(zip(*mask_coords)))
mask_coords = coord_transform(mask_coords[0], mask_coords[1],
mask_coords[2], aff)
mask_coords = np.asarray(mask_coords).T
if (radius is not None
and LooseVersion(sklearn.__version__) < LooseVersion('0.16')):
# Fix for scikit learn versions below 0.16. See
# https://github.com/scikit-learn/scikit-learn/issues/4072
radius += 1e-6
clf = neighbors.NearestNeighbors(radius=radius)
A = clf.fit(mask_coords).radius_neighbors_graph(seeds)
A = A.tolil()
for i, nearest in enumerate(nearests):
if nearest is None:
continue
A[i, nearest] = True
# Include the voxel containing the seed itself if not masked
mask_coords = mask_coords.astype(int).tolist()
for i, seed in enumerate(seeds):
try:
A[i, mask_coords.index(seed)] = True
except ValueError:
# seed is not in the mask
pass
if not allow_overlap:
if np.any(A.sum(axis=0) >= 2):
raise ValueError('Overlap detected between spheres')
return A
def import_mat_func(input_file, ID, atlas_select, NETWORK, pynets_dir,
node_size, mask, thr, graph, parlistfile, sps_model,
all_nets):
if '.nii' in input_file and parlistfile == None and NETWORK == None:
if graph == False:
func_file = input_file
if all_nets != None:
func_img = nib.load(func_file)
par_path = pynets_dir + '/RSN_refs/yeo.nii.gz'
par_img = nib.load(par_path)
par_data = par_img.get_data()
ref_dict = {
0: 'unknown',
1: 'VIS',
2: 'SM',
3: 'DA',
4: 'VA',
5: 'LIM',
6: 'FP',
7: 'DEF'
}
def get_ref_net(x, y, z):
aff_inv = npl.inv(func_img.affine)
# apply_affine(aff, (x,y,z)) # vox to mni
vox_coord = apply_affine(aff_inv, (x, y, z)) # mni to vox
return ref_dict[int(par_data[int(vox_coord[0]),
int(vox_coord[1]),
int(vox_coord[2])])]
dir_path = os.path.dirname(os.path.realpath(func_file))
atlas = getattr(datasets, 'fetch_%s' % atlas_select)()
atlas_name = atlas['description'].splitlines()[0]
print(atlas_name + ' comes with {0}.'.format(atlas.keys()))
print("\n")
coords = np.vstack(
(atlas.rois['x'], atlas.rois['y'], atlas.rois['z'])).T
if all_nets != None:
membership = pd.Series([
get_ref_net(coord[0], coord[1], coord[2])
for coord in coords
])
print('Stacked atlas coordinates in array of shape {0}.'.format(
coords.shape))
print("\n")
if mask is not None:
from nilearn import masking
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data != 0)))
for coord in coords:
if tuple(coord) not in mask_coords:
print('Removing coordinate: ' + str(tuple(coord)) +
' since it falls outside of network mask...')
ix = np.where(coords == coord)[0][0]
coords = np.delete(coords, ix, axis=0)
print(str(len(coords)))
print("\n")
spheres_masker = input_data.NiftiSpheresMasker(
seeds=coords,
radius=float(node_size),
memory='nilearn_cache',
memory_level=5,
verbose=2)
time_series = spheres_masker.fit_transform(func_file)
correlation_measure = ConnectivityMeasure(kind='correlation')
correlation_matrix = correlation_measure.fit_transform(
[time_series])[0]
print("\n")
print('Time series has {0} samples'.format(time_series.shape[0]))
print("\n")
else:
correlation_matrix = genfromtxt(graph, delimiter='\t')
plt.imshow(correlation_matrix,
vmin=-1.,
vmax=1.,
cmap='RdBu_r',
interpolation='nearest')
plt.colorbar()
plt.title(atlas_name + ' correlation matrix')
out_path_fig = dir_path + '/' + ID + '_' + atlas_name + '_adj_mat_corr.png'
plt.savefig(out_path_fig)
plt.close()
##Tweak edge_threshold to keep only the strongest connections.
atlast_graph_title = atlas_name + ' correlation graph'
if mask is None:
atlast_graph_title = atlas_name + ' correlation graph'
else:
atlast_graph_title = atlas_name + ' Masked Nodes'
edge_threshold = str(float(thr) * 100) + '%'
# plot graph:
if all_nets != None:
# coloring code:
n = len(membership.unique())
clust_pal = sns.color_palette("Set1", n)
clust_lut = dict(
zip(map(str, np.unique(membership.astype('category'))),
clust_pal))
clust_colors = colors.to_rgba_array(membership.map(clust_lut))
plotting.plot_connectome(correlation_matrix,
coords,
node_color=clust_colors,
title=atlast_graph_title,
edge_threshold=edge_threshold,
node_size=20,
colorbar=True)
else:
plotting.plot_connectome(correlation_matrix,
coords,
title=atlast_graph_title,
edge_threshold=edge_threshold,
node_size=20,
colorbar=True)
out_path_fig = dir_path + '/' + ID + '_' + atlas_name + '_connectome_viz.png'
plt.savefig(out_path_fig)
plt.close()
time_series_path = dir_path + '/' + ID + '_ts.txt'
np.savetxt(time_series_path, time_series, delimiter='\t')
mx = genfromtxt(time_series_path, delimiter='')
elif '.nii' in input_file and parlistfile != None and NETWORK == None: # block of code for whole brain parcellations
if all_nets != None:
par_path = pynets_dir + '/RSN_refs/yeo.nii.gz'
par_img = nib.load(par_path)
par_data = par_img.get_data()
ref_dict = {
0: 'unknown',
1: 'VIS',
2: 'SM',
3: 'DA',
4: 'VA',
5: 'LIM',
6: 'FP',
7: 'DEF'
}
def get_ref_net(x, y, z):
aff_inv = npl.inv(bna_img.affine)
# apply_affine(aff, (x,y,z)) # vox to mni
vox_coord = apply_affine(aff_inv, (x, y, z)) # mni to vox
return ref_dict[int(par_data[int(vox_coord[0]),
int(vox_coord[1]),
int(vox_coord[2])])]
func_file = input_file
dir_path = os.path.dirname(os.path.realpath(func_file))
atlas_name = parlistfile.split('/')[-1].split('.')[0]
# Code for getting name and coordinates of parcels.
# Adapted from Dan L. (https://github.com/danlurie/despolab_lesion/blob/master/code/sandbox/Sandbox%20-%20Calculate%20and%20plot%20HCP%20mean%20matrix.ipynb)
bna_img = nib.load(parlistfile)
bna_data = bna_img.get_data()
if bna_img.get_data_dtype() != np.dtype(np.int):
bna_data_for_coords = bna_img.get_data()
# Number of parcels:
par_max = np.ceil(np.max(bna_data_for_coords)).astype('int')
bna_data = bna_data.astype('int16')
else:
par_max = np.max(bna_data)
img_stack = []
for idx in range(1, par_max + 1):
roi_img = bna_data == idx
img_stack.append(roi_img)
img_stack = np.array(img_stack)
img_list = []
for idx in range(par_max):
roi_img = nilearn.image.new_img_like(bna_img, img_stack[idx])
img_list.append(roi_img)
bna_4D = nilearn.image.concat_imgs(img_list)
coords = []
for roi_img in img_list:
coords.append(nilearn.plotting.find_xyz_cut_coords(roi_img))
coords = np.array(coords)
if all_nets != None:
membership = pd.Series([
get_ref_net(coord[0], coord[1], coord[2]) for coord in coords
])
# atlas = getattr(datasets, 'fetch_%s' % atlas_select)()
# atlas_name = atlas['description'].splitlines()[0]
print("\n")
print(atlas_name + ' comes with {0}.'.format(par_max) + 'parcels')
print("\n")
print("\n")
print('Stacked atlas coordinates in array of shape {0}.'.format(
coords.shape))
print("\n")
if mask is not None:
from nilearn import masking
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data != 0)))
for coord in coords:
if tuple(coord) not in mask_coords:
print('Removing coordinate: ' + str(tuple(coord)) +
' since it falls outside of network mask...')
ix = np.where(coords == coord)[0][0]
coords = np.delete(coords, ix, axis=0)
print(str(len(coords)))
##extract time series from whole brain parcellaions:
parcellation = nib.load(parlistfile)
parcel_masker = input_data.NiftiLabelsMasker(labels_img=parcellation,
background_label=0,
memory='nilearn_cache',
memory_level=5)
time_series = parcel_masker.fit_transform(func_file)
##old ref code for coordinate parcellations:
#spheres_masker = input_data.NiftiSpheresMasker(seeds=coords, radius=float(node_size), memory='nilearn_cache', memory_level=2, verbose=2)
#time_series = spheres_masker.fit_transform(func_file)
correlation_measure = ConnectivityMeasure(kind='correlation')
correlation_matrix = correlation_measure.fit_transform([time_series
])[0]
print("\n")
print('Time series has {0} samples'.format(time_series.shape[0]))
print("\n")
plt.imshow(correlation_matrix,
vmin=-1.,
vmax=1.,
cmap='RdBu_r',
interpolation='nearest')
plt.colorbar()
plt.title(atlas_name + ' correlation matrix')
out_path_fig = dir_path + '/' + ID + '_' + atlas_name + '_adj_mat_corr.png'
plt.savefig(out_path_fig)
plt.close()
##Tweak edge_threshold to keep only the strongest connections.
atlast_graph_title = atlas_name + ' correlation graph'
if mask is None:
atlast_graph_title = atlas_name + ' correlation graph'
else:
atlast_graph_title = atlas_name + ' Masked Nodes'
edge_threshold = str(float(thr) * 100) + '%'
if all_nets != None:
# coloring code:
n = len(membership.unique())
clust_pal = sns.color_palette("Set1", n)
clust_lut = dict(
zip(map(str, np.unique(membership.astype('category'))),
clust_pal))
clust_colors = colors.to_rgba_array(membership.map(clust_lut))
plotting.plot_connectome(correlation_matrix,
coords,
node_color=clust_colors,
title=atlast_graph_title,
edge_threshold=edge_threshold,
node_size=20,
colorbar=True)
else:
plotting.plot_connectome(correlation_matrix,
coords,
title=atlast_graph_title,
edge_threshold=edge_threshold,
node_size=20,
colorbar=True)
out_path_fig = dir_path + '/' + ID + '_' + atlas_name + '_connectome_viz.png'
plt.savefig(out_path_fig)
plt.close()
time_series_path = dir_path + '/' + ID + '_ts.txt'
np.savetxt(time_series_path, time_series, delimiter='\t')
mx = genfromtxt(time_series_path, delimiter='')
elif '.nii' in input_file and NETWORK != None:
func_file = input_file
##Reference RSN list
load_path = pynets_dir + '/RSN_refs/' + NETWORK + '_coords.csv'
df = pd.read_csv(load_path).ix[:, 0:4]
i = 1
coords = []
labels = []
for i in range(len(df)):
print("ROI Reference #: " + str(i))
x = int(df.ix[i, 1])
y = int(df.ix[i, 2])
z = int(df.ix[i, 3])
print("X:" + str(x) + " Y:" + str(y) + " Z:" + str(z))
coords.append((x, y, z))
labels.append(i)
print("\n")
print(coords)
print(labels)
print("\n")
print("-------------------")
i + 1
dir_path = os.path.dirname(os.path.realpath(func_file))
##Grow ROIs
##If masking, remove those coords that fall outside of the mask
if mask != None:
from nilearn import masking
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data != 0)))
for coord in coords:
if coord in mask_coords:
print('Removing coordinate: ' + str(coord) +
' since it falls outside of network mask...')
coords.remove(coord)
masker = input_data.NiftiSpheresMasker(seeds=coords,
radius=float(node_size),
allow_overlap=True,
memory_level=5,
memory='nilearn_cache',
verbose=2)
time_series = masker.fit_transform(func_file)
for time_serie, label in zip(time_series.T, labels):
plt.plot(time_serie, label=label)
plt.title(NETWORK + ' Network Time Series')
plt.xlabel('Scan Number')
plt.ylabel('Normalized Signal')
plt.legend()
plt.tight_layout()
out_path_fig = dir_path + '/' + ID + '_' + NETWORK + '_TS_plot.png'
plt.savefig(out_path_fig)
plt.close()
connectivity_measure = ConnectivityMeasure(kind='correlation')
correlation_matrix = connectivity_measure.fit_transform([time_series
])[0]
plot_title = NETWORK + ' Network Time Series'
plotting.plot_connectome(correlation_matrix, coords, title=plot_title)
##Display connectome with hemispheric projections.
title = "Connectivity Projected on the " + NETWORK
out_path_fig = dir_path + '/' + ID + '_' + NETWORK + '_connectome_plot.png'
plotting.plot_connectome(correlation_matrix,
coords,
title=title,
display_mode='lyrz',
output_file=out_path_fig)
time_series_path = dir_path + '/' + ID + '_' + NETWORK + '_ts.txt'
np.savetxt(time_series_path, time_series, delimiter='\t')
mx = genfromtxt(time_series_path, delimiter='')
else:
DR_st_1 = input_file
dir_path = os.path.dirname(os.path.realpath(DR_st_1))
mx = genfromtxt(DR_st_1, delimiter='')
from sklearn.covariance import GraphLassoCV, ShrunkCovariance, graph_lasso
estimator = GraphLassoCV()
try:
est = estimator.fit(mx)
except:
print(
"Error: Lasso sparse matrix modeling failed. Check your input time-series data..."
)
# emp_cov = covariance.empirical_covariance(mx)
# shrunk_cov = covariance.shrunk_covariance(emp_cov, shrinkage=0.8) # Set shrinkage closer to 1 for poorly-conditioned data
#
# alphaRange = 10.0 ** np.arange(-8,0) # 1e-7 to 1e-1 by order of magnitude
# for alpha in alphaRange:
# try:
# estimator = covariance.graph_lasso(shrunk_cov, alpha)
# print("Calculated graph-lasso covariance matrix for alpha=%s"%alpha)
# except FloatingPointError:
# print("Failed at alpha=%s"%alpha)
# estimator = ShrunkCovariance()
# est = estimator.fit(mx)
if NETWORK != None:
est_path = dir_path + '/' + ID + '_' + NETWORK + '_est%s.txt' % (
'_sps_inv' if sps_model else '')
else:
est_path = dir_path + '/' + ID + '_est%s.txt' % ('_sps_inv'
if sps_model else '')
if sps_model == False:
if NETWORK != None:
np.savetxt(est_path, correlation_matrix, delimiter='\t')
else:
np.savetxt(est_path, correlation_matrix, delimiter='\t')
elif sps_model == True:
np.savetxt(est_path, estimator.precision_, delimiter='\t')
return (mx, est_path)
def fit(self, imgs, y, data_train=None):
"""Fit the searchlight
Parameters
----------
img : Niimg-like object
See http://nilearn.github.io/building_blocks/manipulating_mr_images.html#niimg.
4D image.
y : 1D array-like
Target variable to predict. Must have exactly as many elements as
3D images in img.
data_train : np.array, optional
Data to train on, if data for training is different from X.
Attributes
----------
`scores_` : numpy.ndarray
search_light scores. Same shape as input parameter
process_mask_img.
"""
# Compute world coordinates of all in-mask voxels.
mask, mask_affine = masking._load_mask_img(self.mask_img)
mask_coords = np.where(mask != 0)
mask_coords = np.asarray(mask_coords + (np.ones(len(mask_coords[0]),
dtype=np.int),))
mask_coords = np.dot(mask_affine, mask_coords)[:3].T
# Compute world coordinates of all in-process mask voxels
if self.process_mask_img is None:
process_mask = mask
process_mask_coords = mask_coords
else:
process_mask, process_mask_affine = \
masking._load_mask_img(self.process_mask_img)
process_mask_coords = np.where(process_mask != 0)
process_mask_coords = \
np.asarray(process_mask_coords
+ (np.ones(len(process_mask_coords[0]),
dtype=np.int),))
process_mask_coords = np.dot(process_mask_affine,
process_mask_coords)[:3].T
clf = neighbors.NearestNeighbors(radius=self.radius)
A = clf.fit(mask_coords).radius_neighbors_graph(process_mask_coords)
del process_mask_coords, mask_coords
A = A.tolil()
# scores is an 1D array of CV scores with length equals to the number
# of voxels in processing mask (columns in process_mask)
X = masking._apply_mask_fmri(imgs,
nibabel.Nifti1Image(as_ndarray(mask, dtype=np.int8),
mask_affine))
estimator = self.estimator
if isinstance(estimator, basestring):
estimator = ESTIMATOR_CATALOG[estimator]()
# From here starts Dima's modifications, added nii_optional argument
# to .fit method
if data_train is None:
scores = search_light(X, y, estimator, A,
self.scoring, self.cv, self.n_jobs,
self.verbose)
else:
scores = search_light(X, y, estimator, A,
self.scoring, self.cv, self.n_jobs,
self.verbose, data_train)
scores_3D = np.zeros(process_mask.shape)
scores_3D[process_mask] = scores
self.scores_ = scores_3D
return self
def compute_spheres_values(self, imgs):
start_t = time.time()
# Force to get a list of imgs even if only one is given
imgs_to_check = [imgs] if not isinstance(imgs, list) else imgs
# Load Nifti images
ref_shape = imgs_to_check[0].dataobj.shape
ref_affine = imgs_to_check[0].affine
imgs = []
for img in imgs_to_check:
# check if image is 4D
imgs.append(check_niimg_4d(img))
# Check that all images have same number of volumes
if ref_shape != img.dataobj.shape:
raise ValueError("All fMRI image must have same shape")
if np.array_equal(ref_affine, img.affine):
warnings.warn("fMRI images do not have same affine")
self.ref_img = imgs[0]
# Compute world coordinates of the seeds
process_mask_img = check_niimg_3d(self.process_mask_img)
process_mask_img = image.resample_to_img(
process_mask_img, imgs[0], interpolation='nearest'
)
self.process_mask_img = process_mask_img
process_mask, process_mask_affine = masking._load_mask_img(
process_mask_img
)
process_mask_coords = np.where(process_mask != 0)
self.vx_mask_coords = process_mask_coords
process_mask_coords = coord_transform(
process_mask_coords[0], process_mask_coords[1],
process_mask_coords[2], process_mask_affine)
process_mask_coords = np.asarray(process_mask_coords).T
if self.verbose:
print("{} seeds found in the mask".format(len(process_mask_coords)))
# Compute spheres
_, A = _apply_mask_and_get_affinity(
process_mask_coords, imgs[0], self.radius, True,
mask_img=self.mask_img
)
# Number of runs: 1 4D fMRI image / run
n_runs = len(imgs)
# Number of spheres (or seed voxels)
n_spheres = A.shape[0]
# Number of volumes in each 4D fMRI image
n_conditions = imgs[0].dataobj.shape[3]
mask_img = check_niimg_3d(self.mask_img)
mask_img = image.resample_img(
mask_img, target_affine=imgs[0].affine,
target_shape=imgs[0].shape[:3], interpolation='nearest'
)
masked_imgs_data = []
for i_run, img in enumerate(imgs):
masked_imgs_data.append(masking._apply_mask_fmri(img, mask_img))
# Extract data of each sphere
# X will be #spheres x #run x #conditions x #values
X = []
for i_sph in range(n_spheres):
# Indexes of all voxels included in the current sphere
sph_indexes = A.rows[i_sph]
if len(sph_indexes) == 0:
# Append when no data are available around the process voxel
X.append(np.full((n_runs, n_conditions, 1), 0))
print("Empty sphere")
else:
# Number of voxel in the current sphere
n_values = len(sph_indexes)
sub_X = np.empty((n_runs, n_conditions, n_values), dtype=object)
for i_run, img in enumerate(imgs):
for i_cond in range(n_conditions):
sub_X[i_run, i_cond] = masked_imgs_data[i_run][i_cond][
sph_indexes]
X.append(sub_X)
if self.verbose:
dt = time.time() - start_t
print("Elapsed time to extract spheres values: {:.01f}s".format(dt))
self.spheres_values = X
def parcel_masker(roi, coords, parcel_list, labels, dir_path, ID,
perc_overlap):
"""
Evaluate the affinity of any arbitrary list of parcel nodes for a user-specified ROI mask.
Parameters
----------
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
coords : list
List of (x, y, z) tuples in mm-space corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
parcel_list : list
List of 3D boolean numpy arrays or binarized Nifti1Images corresponding to ROI masks.
labels : list
List of string labels corresponding to ROI nodes.
dir_path : str
Path to directory containing subject derivative data for given run.
ID : str
A subject id or other unique identifier.
perc_overlap : float
Value 0-1 indicating a threshold of spatial overlap to use as a spatial error cushion in the case of
evaluating ROI-mask membership from a given list of parcel masks.
Returns
-------
coords_adj : list
Filtered list of (x, y, z) tuples in mm-space with a spatial affinity for the specified ROI mask.
labels_adj : list
Filtered list of string labels corresponding to ROI nodes with a spatial affinity for the specified ROI mask.
parcel_list_adj : list
Filtered list of 3D boolean numpy arrays or binarized Nifti1Images corresponding to ROI masks with a spatial
affinity to the specified ROI mask.
"""
from pynets.core import nodemaker
from nilearn.image import resample_img
from nilearn import masking
import os.path as op
mask_img = nib.load(roi)
mask_aff = mask_img.affine
mask_data, _ = masking._load_mask_img(roi)
mask_img.uncache()
i = 0
indices = []
for parcel in parcel_list:
parcel_vol = np.zeros(mask_data.shape, dtype=bool)
parcel_data_reshaped = np.asarray(
resample_img(parcel,
target_affine=mask_aff,
target_shape=mask_data.shape).dataobj)
parcel_vol[parcel_data_reshaped == 1] = 1
# Count number of unique voxels where overlap of parcel and mask occurs
overlap_count = len(
np.unique(
np.where((mask_data.astype('uint16') == 1)
& (parcel_vol.astype('uint16') == 1))))
# Count number of total unique voxels within the parcel
total_count = len(
np.unique(np.where((parcel_vol.astype('uint16') == 1))))
# Calculate % overlap
try:
overlap = float(overlap_count / total_count)
except:
print(
f"\nWarning: No overlap of parcel {labels[i]} with roi mask!\n"
)
overlap = float(0)
if overlap >= perc_overlap:
print(
f"{(100 * overlap):.2f}{'% of parcel '}{labels[i]}{' falls within mask...'}"
)
else:
indices.append(i)
i = i + 1
labels_adj = list(labels)
coords_adj = list(tuple(x) for x in coords)
parcel_list_adj = parcel_list
try:
for ix in sorted(indices, reverse=True):
print(f"{'Removing: '}{labels_adj[ix]}{' at '}{coords_adj[ix]}")
del labels_adj[ix], coords_adj[ix], parcel_list_adj[ix]
except RuntimeError:
print(
'ERROR: Restrictive masking. No parcels remain after masking with brain mask/roi...'
)
# Create a resampled 3D atlas that can be viewed alongside mask img for QA
resampled_parcels_nii_path = f"{dir_path}/{ID}_parcels_resampled2roimask_{op.basename(roi).split('.')[0]}.nii.gz"
resampled_parcels_map_nifti = resample_img(
nodemaker.create_parcel_atlas(parcel_list_adj)[0],
target_affine=mask_aff,
target_shape=mask_data.shape,
interpolation='nearest')
nib.save(resampled_parcels_map_nifti, resampled_parcels_nii_path)
resampled_parcels_map_nifti.uncache()
if not coords_adj:
raise ValueError(
'\nERROR: ROI mask was likely too restrictive and yielded < 2 remaining parcels'
)
return coords_adj, labels_adj, parcel_list_adj
def apply_mask(self, series, mask_img):
mask_img = _utils.check_niimg_3d(mask_img)
mask, mask_affine = masking._load_mask_img(mask_img)
mask_img = image.new_img_like(mask_img, mask, mask_affine)
mask_data = _utils.as_ndarray(mask_img.get_data(), dtype=np.bool)
return series[mask_data].T
def import_mat_func(input_file, ID, atlas_select, NETWORK, pynets_dir, node_size, mask, thr):
if '.nii' in input_file and NETWORK == None:
func_file=input_file
dir_path = os.path.dirname(os.path.realpath(func_file))
atlas = getattr(datasets, 'fetch_%s' % atlas_select)()
atlas_name = atlas['description'].splitlines()[0]
print("\n")
print(atlas_name + ' comes with {0}.'.format(atlas.keys()))
print("\n")
coords = np.vstack((atlas.rois['x'], atlas.rois['y'], atlas.rois['z'])).T
print("\n")
print('Stacked atlas coordinates in array of shape {0}.'.format(coords.shape))
print("\n")
if mask is not None:
from nilearn import masking
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data != 0)))
for coord in coords:
if tuple(coord) not in mask_coords:
print('Removing coordinate: ' + str(tuple(coord)) + ' since it falls outside of network mask...')
ix = np.where(coords == coord)[0][0]
coords = np.delete(coords, ix, axis=0)
print(str(len(coords)))
spheres_masker = input_data.NiftiSpheresMasker(seeds=coords, radius=float(node_size), memory='nilearn_cache', memory_level=5, verbose=2, standardize=True)
time_series = spheres_masker.fit_transform(func_file)
correlation_measure = ConnectivityMeasure(kind='correlation')
correlation_matrix = correlation_measure.fit_transform([time_series])[0]
print("\n")
print('Time series has {0} samples'.format(time_series.shape[0]))
print("\n")
plt.imshow(correlation_matrix, vmin=-1., vmax=1., cmap='RdBu_r', interpolation='nearest')
plt.colorbar()
plt.title(atlas_name + ' correlation matrix')
out_path_fig=dir_path + '/' + ID + '_' + atlas_name + '_adj_mat_cov.png'
plt.savefig(out_path_fig)
plt.close()
# Tweak edge_threshold to keep only the strongest connections.
atlast_graph_title = atlas_name + ' correlation graph'
if mask is None:
atlast_graph_title = atlas_name + ' correlation graph'
else:
atlast_graph_title = atlas_name + ' Masked Nodes'
edge_threshold = str(float(thr)*100) +'%'
plotting.plot_connectome(correlation_matrix, coords, title=atlast_graph_title, edge_threshold=edge_threshold, node_size=20, colorbar=True)
out_path_fig=dir_path + '/' + ID + '_' + atlas_name + '_connectome_viz.png'
plt.savefig(out_path_fig)
plt.close()
time_series_path = dir_path + '/' + ID + '_ts.txt'
np.savetxt(time_series_path, time_series, delimiter='\t')
mx = genfromtxt(time_series_path, delimiter='')
elif '.nii' in input_file and NETWORK != None:
func_file=input_file
##Reference RSN list
load_path= pynets_dir + '/RSN_refs/' + NETWORK + '_coords.csv'
df = pd.read_csv(load_path).ix[:,0:4]
i=1
coords = []
labels = []
for i in range(len(df)):
print("ROI Reference #: " + str(i))
x = int(df.ix[i,1])
y = int(df.ix[i,2])
z = int(df.ix[i,3])
print("X:" + str(x) + " Y:" + str(y) + " Z:" + str(z))
coords.append((x, y, z))
labels.append(i)
print("\n")
print(coords)
print(labels)
print("\n")
print("-------------------")
i + 1
dir_path = os.path.dirname(os.path.realpath(func_file))
##Grow ROIs
##If masking, remove those coords that fall outside of the mask
if mask != None:
from nilearn import masking
mask_data, _ = masking._load_mask_img(mask)
mask_coords = list(zip(*np.where(mask_data != 0)))
for coord in coords:
if coord in mask_coords:
print('Removing coordinate: ' + str(coord) + ' since it falls outside of network mask...')
coords.remove(coord)
masker = input_data.NiftiSpheresMasker(
seeds=coords, radius=float(node_size), allow_overlap=True, memory_level=5,
memory='nilearn_cache', verbose=2, standardize=True)
time_series = masker.fit_transform(func_file)
for time_serie, label in zip(time_series.T, labels):
plt.plot(time_serie, label=label)
plt.title(NETWORK + ' Network Time Series')
plt.xlabel('Scan Number')
plt.ylabel('Normalized Signal')
plt.legend()
plt.tight_layout()
out_path_fig=dir_path + '/' + ID + '_' + NETWORK + '_TS_plot.png'
plt.savefig(out_path_fig)
plt.close()
connectivity_measure = ConnectivityMeasure(kind='partial correlation')
partial_correlation_matrix = connectivity_measure.fit_transform([time_series])[0]
plot_title = NETWORK + ' Network Time Series'
plotting.plot_connectome(partial_correlation_matrix, coords,
title=plot_title)
# Display connectome with hemispheric projections.
title = "Connectivity Projected on the " + NETWORK
out_path_fig=dir_path + '/' + ID + '_' + NETWORK + '_connectome_plot.png'
plotting.plot_connectome(partial_correlation_matrix, coords, title=title,
display_mode='lyrz', output_file=out_path_fig)
time_series_path = dir_path + '/' + ID + '_' + NETWORK + '_ts.txt'
np.savetxt(time_series_path, time_series, delimiter='\t')
mx = genfromtxt(time_series_path, delimiter='')
else:
DR_st_1=input_file
dir_path = os.path.dirname(os.path.realpath(DR_st_1))
mx = genfromtxt(DR_st_1, delimiter='')
from sklearn.covariance import GraphLassoCV, ShrunkCovariance, graph_lasso
estimator = GraphLassoCV()
try:
est = estimator.fit(mx)
except:
# print("WARNING: Lasso Cross-Validation Failed. Using Shrunk Covariance instead...")
# emp_cov = covariance.empirical_covariance(mx)
# shrunk_cov = covariance.shrunk_covariance(emp_cov, shrinkage=0.8) # Set shrinkage closer to 1 for poorly-conditioned data
#
# alphaRange = 10.0 ** np.arange(-8,0) # 1e-7 to 1e-1 by order of magnitude
# for alpha in alphaRange:
# try:
# estimator = covariance.graph_lasso(shrunk_cov, alpha)
# print("Calculated graph-lasso covariance matrix for alpha=%s"%alpha)
# except FloatingPointError:
# print("Failed at alpha=%s"%alpha)
estimator = ShrunkCovariance()
est = estimator.fit(mx)
if NETWORK != None:
est_path_cov = dir_path + '/' + ID + '_' + NETWORK + '_est_cov.txt'
est_path_sps_inv_cov = dir_path + '/' + ID + '_' + NETWORK + '_est_sps_inv_cov.txt'
else:
est_path_cov = dir_path + '/' + ID + '_est_cov.txt'
est_path_sps_inv_cov = dir_path + '/' + ID + '_est_sps_inv_cov.txt'
np.savetxt(est_path_cov, estimator.covariance_, delimiter='\t')
np.savetxt(est_path_sps_inv_cov, estimator.precision_, delimiter='\t')
return(mx, est_path_cov, est_path_sps_inv_cov)
def coords_masker(roi, coords, labels, error):
"""
Evaluate the affinity of any arbitrary list of coordinate nodes for a user-specified ROI mask.
Parameters
----------
roi : str
File path to binarized/boolean region-of-interest Nifti1Image file.
coords : list
List of (x, y, z) tuples in mm-space corresponding to a coordinate atlas used or
which represent the center-of-mass of each parcellation node.
labels : list
List of string labels corresponding to ROI nodes.
error : int
Rounded euclidean distance, in units of voxel number, to use as a spatial error cushion in the case of
evaluating the spatial affinity of a given list of coordinates to the given ROI mask.
Returns
-------
coords : list
Filtered list of (x, y, z) tuples in mm-space with a spatial affinity for the specified ROI mask.
labels : list
Filtered list of string labels corresponding to ROI nodes with a spatial affinity for the specified ROI mask.
"""
from nilearn import masking
from pynets.core.nodemaker import mmToVox
mask_data, mask_aff = masking._load_mask_img(roi)
x_vox = np.diagonal(mask_aff[:3, 0:3])[0]
y_vox = np.diagonal(mask_aff[:3, 0:3])[1]
z_vox = np.diagonal(mask_aff[:3, 0:3])[2]
# mask_coords = list(zip(*np.where(mask_data == True)))
coords_vox = []
for i in coords:
coords_vox.append(mmToVox(mask_aff, i))
coords_vox = list(
tuple(map(lambda y: isinstance(y, float) and int(round(y, 0)), x))
for x in coords_vox)
#coords_vox = list(set(list(tuple(x) for x in coords_vox)))
bad_coords = []
for coord_vox in coords_vox:
sphere_vol = np.zeros(mask_data.shape, dtype=bool)
sphere_vol[tuple(coord_vox)] = 1
if (mask_data & sphere_vol).any():
print(f"{coord_vox}{' falls within mask...'}")
continue
inds = get_sphere(coord_vox, error, (np.abs(x_vox), y_vox, z_vox),
mask_data.shape)
sphere_vol[tuple(inds.T)] = 1
if (mask_data & sphere_vol).any():
print(
f"{coord_vox}{' is within a + or - '}{float(error):.2f}{' mm neighborhood...'}"
)
continue
bad_coords.append(coord_vox)
bad_coords = [x for x in bad_coords if x is not None]
indices = []
for bad_coords in bad_coords:
indices.append(coords_vox.index(bad_coords))
labels = list(labels)
coords = list(tuple(x) for x in coords)
try:
for ix in sorted(indices, reverse=True):
print(f"{'Removing: '}{labels[ix]}{' at '}{coords[ix]}")
del labels[ix], coords[ix]
except RuntimeError:
print(
'ERROR: Restrictive masking. No coords remain after masking with brain mask/roi...'
)
if len(coords) <= 1:
raise ValueError(
'\nERROR: ROI mask was likely too restrictive and yielded < 2 remaining coords'
)
return coords, labels
def grow_nodes(bedpostx_dir, coords, node_size, parc, parcel_list,
net_parcels_map_nifti, network):
from nilearn import masking
import nipype.interfaces.fsl as fsl
import nipype.pipeline.engine as pe
import glob
####Custom inputs####
try:
FSLDIR = os.environ['FSLDIR']
except NameError:
print('FSLDIR environment variable not set!')
nodif_brain_mask_path = bedpostx_dir + '/nodif_brain_mask.nii.gz'
input_MNI = FSLDIR + '/data/standard/MNI152_T1_1mm_brain.nii.gz'
volumes_dir = bedpostx_dir + '/volumes'
####Custom inputs####
def save_parcel_vols(bedpostx_dir, parcel_list, net_parcels_map_nifti):
import os
import time
if net_parcels_map_nifti:
net_parcels_map_file = bedpostx_dir + '/net_parcels_map_nifti.nii.gz'
nib.save(net_parcels_map_nifti, net_parcels_map_file)
volumes_dir = bedpostx_dir + '/volumes'
if not os.path.exists(volumes_dir):
os.mkdir(volumes_dir)
num_vols = len(parcel_list)
i = 0
for vol in parcel_list:
out_path = volumes_dir + '/region_' + str(i) + '.nii.gz'
nib.save(vol, out_path)
i = i + 1
num_vols_pres = float(len(next(os.walk(volumes_dir))[2]))
while num_vols_pres < float(num_vols):
time.sleep(1)
num_vols_pres = float(len(next(os.walk(volumes_dir))[2]))
return
save_parcel_vols(bedpostx_dir, parcel_list, net_parcels_map_nifti)
##Delete any existing roi spheres
del_files_spheres = glob.glob(volumes_dir + '/roi_sphere*')
try:
for i in del_files_spheres:
os.remove(i)
except:
pass
del_files_parcels = glob.glob(volumes_dir + '/roi_parcel*')
try:
for i in del_files_parcels:
os.remove(i)
except:
pass
del_files_points = glob.glob(volumes_dir + '/roi_point*')
try:
for i in del_files_points:
os.remove(i)
except:
pass
if parc == False:
x_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[0]
y_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[1]
z_vox = np.diagonal(
masking._load_mask_img(nodif_brain_mask_path)[1][:3, 0:3])[2]
def mmToVox(mmcoords):
voxcoords = ['', '', '']
voxcoords[0] = int((round(int(mmcoords[0]) / x_vox)) + 45)
voxcoords[1] = int((round(int(mmcoords[1]) / y_vox)) + 63)
voxcoords[2] = int((round(int(mmcoords[2]) / z_vox)) + 36)
return voxcoords
##Convert coords back to voxels
coords_vox = []
for coord in coords:
coords_vox.append(mmToVox(coord))
coords = list(tuple(x) for x in coords_vox)
j = 0
for i in coords:
##Grow spheres at ROI
X = coords[j][0]
Y = coords[j][1]
Z = coords[j][2]
out_file1 = volumes_dir + '/roi_point_' + str(j) + '.nii.gz'
args = '-mul 0 -add 1 -roi ' + str(X) + ' 1 ' + str(
Y) + ' 1 ' + str(Z) + ' 1 0 1'
maths = fsl.ImageMaths(in_file=input_MNI,
op_string=args,
out_file=out_file1)
os.system(maths.cmdline + ' -odt float')
out_file2 = volumes_dir + '/roi_sphere_' + str(j) + '.nii.gz'
args = '-kernel sphere ' + str(node_size) + ' -fmean -bin'
maths = fsl.ImageMaths(in_file=out_file1,
op_string=args,
out_file=out_file2)
os.system(maths.cmdline + ' -odt float')
##Map ROIs from Standard Space to diffusion Space:
##Applying xfm and input matrix to transform ROI's between diff and MNI using FLIRT,
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = nodif_brain_mask_path
flirt.inputs.in_file = out_file2
out_file_diff = out_file2.split('.nii')[0] + '_diff.nii.gz'
flirt.inputs.out_file = out_file_diff
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.run()
j = j + 1
del_files_points = glob.glob(volumes_dir + '/roi_point*')
try:
for i in del_files_points:
os.remove(i)
except:
pass
else:
i = 0
for parcel in os.listdir(volumes_dir):
out_file = volumes_dir + '/roi_parcel_' + str(i) + '_diff.nii.gz'
flirt = pe.Node(interface=fsl.FLIRT(cost_func='mutualinfo'),
name='coregister')
flirt.inputs.reference = nodif_brain_mask_path
flirt.inputs.in_file = volumes_dir + '/' + parcel
out_file_diff = out_file.split('.nii')[0] + '_diff.nii.gz'
flirt.inputs.out_file = out_file_diff
flirt.inputs.apply_xfm = True
flirt.inputs.in_matrix_file = bedpostx_dir + '/xfms/MNI2diff.mat'
flirt.run()
i = i + 1
def create_seed_mask_file(bedpostx_dir, network):
if network:
probtrackx_output_dir_path = bedpostx_dir + '/probtrackx_' + network
else:
probtrackx_output_dir_path = bedpostx_dir + '/probtrackx_Whole_brain'
if not os.path.exists(probtrackx_output_dir_path):
os.makedirs(probtrackx_output_dir_path)
seed_files = glob.glob(bedpostx_dir + '/volumes/*diff.nii.gz')
seeds_text = probtrackx_output_dir_path + '/masks.txt'
try:
os.remove(seeds_text)
except OSError:
pass
seeds_file_list = []
for seed_file in seed_files:
seeds_file_list.append(seed_file)
f = open(seeds_text, 'w')
l1 = map(lambda x: x + '\n', seeds_file_list)
f.writelines(l1)
f.close()
return (seeds_text, probtrackx_output_dir_path)
[seeds_text, probtrackx_output_dir_path
] = create_seed_mask_file(bedpostx_dir, network)
return (seeds_text, probtrackx_output_dir_path)
def parcel_masker(roi, coords, parcel_list, label_names, dir_path, ID, mask,
perc_overlap):
from pynets import nodemaker
from nilearn.image import resample_img
from nilearn import masking
import os.path as op
if mask and roi == mask:
perc_overlap = 0.9
mask_img = nib.load(roi)
mask_data, _ = masking._load_mask_img(roi)
i = 0
indices = []
for parcel in parcel_list:
parcel_vol = np.zeros(mask_data.shape, dtype=bool)
parcel_data_reshaped = resample_img(
parcel,
target_affine=mask_img.affine,
target_shape=mask_data.shape).get_fdata()
parcel_vol[parcel_data_reshaped == 1] = 1
# Count number of unique voxels where overlap of parcel and mask occurs
overlap_count = len(
np.unique(
np.where((mask_data.astype('uint8') == 1)
& (parcel_vol.astype('uint8') == 1))))
# Count number of total unique voxels within the parcel
total_count = len(
np.unique(np.where((parcel_vol.astype('uint8') == 1))))
# Calculate % overlap
try:
overlap = float(overlap_count / total_count)
except RuntimeWarning:
print('\nWarning: No overlap with roi mask!\n')
overlap = float(0)
if overlap >= perc_overlap:
print("%.2f%s%s%s" % (100 * overlap, '% of parcel ',
label_names[i], ' falls within roi mask...'))
else:
indices.append(i)
i = i + 1
label_names_adj = list(label_names)
coords_adj = list(tuple(x) for x in coords)
parcel_list_adj = parcel_list
try:
for ix in sorted(indices, reverse=True):
print("%s%s%s%s" %
('Removing: ', label_names_adj[ix], ' at ', coords_adj[ix]))
label_names_adj.pop(ix)
coords_adj.pop(ix)
parcel_list_adj.pop(ix)
except RuntimeError:
print(
'ERROR: Restrictive masking. No parcels remain after masking with brain mask/roi...'
)
# Create a resampled 3D atlas that can be viewed alongside mask img for QA
resampled_parcels_nii_path = "%s%s%s%s%s%s" % (
dir_path, '/', ID, '_parcels_resampled2roimask_',
op.basename(roi).split('.')[0], '.nii.gz')
resampled_parcels_atlas, _ = nodemaker.create_parcel_atlas(parcel_list_adj)
resampled_parcels_map_nifti = resample_img(resampled_parcels_atlas,
target_affine=mask_img.affine,
target_shape=mask_data.shape)
nib.save(resampled_parcels_map_nifti, resampled_parcels_nii_path)
mask_img.uncache()
resampled_parcels_map_nifti.uncache()
if not coords_adj:
raise ValueError(
'\nERROR: ROI mask was likely too restrictive and yielded < 2 remaining parcels'
)
return coords_adj, label_names_adj, parcel_list_adj
def _apply_mask_and_get_affinity(seeds,
niimg,
radius,
allow_overlap,
mask_img=None):
seeds = list(seeds)
affine = niimg.affine
# Compute world coordinates of all in-mask voxels.
if mask_img is not None:
mask_img = check_niimg_3d(mask_img)
mask_img = image.resample_img(mask_img,
target_affine=affine,
target_shape=niimg.shape[:3],
interpolation='nearest')
mask, _ = masking._load_mask_img(mask_img)
mask_coords = list(zip(*np.where(mask != 0)))
X = masking._apply_mask_fmri(niimg, mask_img)
else:
if np.isnan(np.sum(_safe_get_data(niimg))):
warnings.warn('The imgs you have fed into fit_transform() contains'
' NaN values which will be converted to zeroes ')
X = _safe_get_data(niimg, True).reshape([-1, niimg.shape[3]]).T
else:
X = _safe_get_data(niimg).reshape([-1, niimg.shape[3]]).T
mask_coords = list(np.ndindex(niimg.shape[:3]))
# For each seed, get coordinates of nearest voxel
nearests = []
for sx, sy, sz in seeds:
nearest = np.round(coord_transform(sx, sy, sz, np.linalg.inv(affine)))
nearest = nearest.astype(int)
nearest = (nearest[0], nearest[1], nearest[2])
try:
nearests.append(mask_coords.index(nearest))
except ValueError:
nearests.append(None)
mask_coords = np.asarray(list(zip(*mask_coords)))
mask_coords = coord_transform(mask_coords[0], mask_coords[1],
mask_coords[2], affine)
mask_coords = np.asarray(mask_coords).T
clf = neighbors.NearestNeighbors(radius=radius)
A = clf.fit(mask_coords).radius_neighbors_graph(seeds)
A = A.tolil()
for i, nearest in enumerate(nearests):
if nearest is None:
continue
A[i, nearest] = True
# Include the voxel containing the seed itself if not masked
mask_coords = mask_coords.astype(int).tolist()
for i, seed in enumerate(seeds):
try:
A[i, mask_coords.index(seed)] = True
except ValueError:
# seed is not in the mask
pass
if not allow_overlap:
if np.any(A.sum(axis=0) >= 2):
raise ValueError('Overlap detected between spheres')
return X, A
