def fix_annot_names(subject, parc, clean_subject=None, clean_parc=None, hemi="both", subjects_dir=None):
"""Fix for Freesurfer's mri_surf2surf corrupting label names in annot files
Notes
-----
Requires nibabel > 1.3.0 for annot file I/O
"""
# process args
subjects_dir = get_subjects_dir(subjects_dir)
if clean_subject is None:
clean_subject = subject
if clean_parc is None:
clean_parc = parc
fpaths, hemis = _get_annot_fname(None, subject, hemi, parc, subjects_dir)
clean_fpaths, _ = _get_annot_fname(None, clean_subject, hemi, clean_parc, subjects_dir)
for fpath, clean_fpath, hemi in izip(fpaths, clean_fpaths, hemis):
labels, ctab, names = read_annot(fpath)
_, _, clean_names = read_annot(clean_fpath)
if all(n == nc for n, nc in izip(names, clean_names)):
continue
if len(clean_names) != len(names):
err = "Different names in %s annot files: %s vs. " "%s" % (hemi, str(names), str(clean_names))
raise ValueError(err)
for clean_name, name in izip(clean_names, names):
if not name.startswith(clean_name):
err = "%s does not start with %s" % (str(name), clean_name)
raise ValueError(err)
write_annot(fpath, labels, ctab, clean_names)
def parcels_to_vertices(data, *, lhannot, rhannot, drop=None):
"""
Projects parcellated `data` to vertices defined in annotation files
Assigns np.nan to 'unknown' and 'corpuscallosum' vertices in annotation
files.
Parameters
----------
data : (N,) numpy.ndarray
Parcellated data to be projected to vertices. Parcels should be ordered
by [left, right] hemisphere; ordering within hemisphere should
correspond to the provided annotation files.
{lh,rh}annot : str
Path to .annot file containing labels of parcels on the {left,right}
hemisphere. These must be specified as keyword arguments to avoid
accidental order switching.
drop : list, optional
Specifies regions in {lh,rh}annot that are not present in `data`. NaNs
will be inserted in place of the these regions in the returned data. If
not specified, 'unknown' and 'corpuscallosum' are assumed to not be
present. Default: None
Reurns
------
projected : numpy.ndarray
Vertex-level data
"""
if drop is None:
drop = ['unknown', 'corpuscallosum']
drop = _decode_list(drop)
start = end = 0
projected = []
# check this so we're not unduly surprised by anything...
expected = sum([len(read_annot(a)[-1]) - 2 for a in [lhannot, rhannot]])
if expected != len(data):
raise ValueError('Number of parcels in provided annotation files '
'differs from size of parcellated data array.\n'
' EXPECTED: {} parcels\n'
' RECEIVED: {} parcels'.format(
expected, len(data)))
for annot in [lhannot, rhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
end += len(names) - 2 # unknown and corpuscallosum
# get indices of unknown and corpuscallosum and insert NaN values
inds = [names.index(f) - n for n, f in enumerate(drop)]
currdata = np.insert(data[start:end], inds, np.nan)
# project to vertices and store
projected.append(currdata[labels])
start = end
return np.hstack(projected)
def annot_legend(lh, rh, *args, **kwargs):
"""Plot a legend for a freesurfer parcellation
Parameters
----------
lh : str
Path to the lh annot-file.
rh : str
Path to the rh annot-file.
labels : dict (optional)
Alternative (text) label for (brain) labels.
h : 'auto' | scalar
Height of the figure in inches. If 'auto' (default), the height is
automatically increased to fit all labels.
Returns
-------
legend : :class:`~eelbrain.plot.ColorList`
Figure with legend for the parcellation.
Notes
-----
Instead of :func:`~eelbrain.plot.brain.annot_legend` it is usually
easier to use::
>>> brain = plot.brain.annoot(annot, ...)
>>> legend = brain.plot_legend()
See Also
--------
eelbrain.plot.brain.annot : plot the parcellation on a brain model
"""
_, lh_colors, lh_names = read_annot(lh)
_, rh_colors, rh_names = read_annot(rh)
lh_colors = dict(zip(lh_names, lh_colors[:, :4] / 255.))
rh_colors = dict(zip(rh_names, rh_colors[:, :4] / 255.))
names = set(lh_names)
names.update(rh_names)
colors = {}
seq = [] # sequential order in legend
seq_lh = []
seq_rh = []
for name in names:
if name in lh_colors and name in rh_colors:
if np.array_equal(lh_colors[name], rh_colors[name]):
colors[name] = lh_colors[name]
seq.append(name)
else:
colors[name + '-lh'] = lh_colors[name]
colors[name + '-rh'] = rh_colors[name]
seq_lh.append(name + '-lh')
seq_rh.append(name + '-rh')
elif name in lh_colors:
colors[name + '-lh'] = lh_colors[name]
seq_lh.append(name + '-lh')
else:
colors[name + '-rh'] = rh_colors[name]
seq_rh.append(name + '-rh')
return ColorList(colors, seq + seq_lh + seq_rh, *args, **kwargs)
def annot_legend(lh, rh, *args, **kwargs):
"""Plot a legend for a freesurfer parcellation
Parameters
----------
lh : str
Path to the lh annot-file.
rh : str
Path to the rh annot-file.
labels : dict (optional)
Alternative (text) label for (brain) labels.
h : 'auto' | scalar
Height of the figure in inches. If 'auto' (default), the height is
automatically increased to fit all labels.
Returns
-------
legend : :class:`~eelbrain.plot.ColorList`
Figure with legend for the parcellation.
Notes
-----
Instead of :func:`~eelbrain.plot.brain.annot_legend` it is usually
easier to use::
>>> brain = plot.brain.annoot(annot, ...)
>>> legend = brain.plot_legend()
See Also
--------
eelbrain.plot.brain.annot : plot the parcellation on a brain model
"""
_, lh_colors, lh_names = read_annot(lh)
_, rh_colors, rh_names = read_annot(rh)
lh_colors = dict(izip(lh_names, lh_colors[:, :4] / 255.))
rh_colors = dict(izip(rh_names, rh_colors[:, :4] / 255.))
names = set(lh_names)
names.update(rh_names)
colors = {}
seq = [] # sequential order in legend
seq_lh = []
seq_rh = []
for name in names:
if name in lh_colors and name in rh_colors:
if np.array_equal(lh_colors[name], rh_colors[name]):
colors[name] = lh_colors[name]
seq.append(name)
else:
colors[name + '-lh'] = lh_colors[name]
colors[name + '-rh'] = rh_colors[name]
seq_lh.append(name + '-lh')
seq_rh.append(name + '-rh')
elif name in lh_colors:
colors[name + '-lh'] = lh_colors[name]
seq_lh.append(name + '-lh')
else:
colors[name + '-rh'] = rh_colors[name]
seq_rh.append(name + '-rh')
return ColorList(colors, seq + seq_lh + seq_rh, *args, **kwargs)
def project_to_vertices(data, rhannot, lhannot):
"""
Projects parcellated `data` to vertices defined in annotation files
Assigns np.nan to 'unknown' and 'corpuscallosum' vertices in annotation
files.
Parameters
----------
data : (N,) numpy.ndarray
Parcellated data to be projected to vertices
{rh,lh}annot : str
Path to .annot file containing labels to parcels on the {right,left}
hemisphere
Reurns
------
projected : numpy.ndarray
Vertex-level data
"""
drop = [b'unknown', b'corpuscallosum']
start = end = 0
projected = []
# check this so we're not unduly surprised by anything...
expected = sum([len(read_annot(a)[-1]) - 2 for a in [rhannot, lhannot]])
if expected != len(data):
raise ValueError('Number of parcels in provided annotation files '
'differs from size of parcellated data array.\n'
' EXPECTED: {} parcels\n'
' RECEIVED: {} parcels'.format(
expected, len(data)))
for annot in [rhannot, lhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
end += len(names) - 2 # unknown and corpuscallosum
# get indices of unknown and corpuscallosum and insert NaN values
inds = [names.index(f) - n for n, f in enumerate(drop)]
currdata = np.insert(data[start:end], inds, np.nan)
# project to vertices and store
projected.append(currdata[labels])
start = end
return np.hstack(projected)
def test_source_space():
"Test SourceSpace dimension"
data_dir = mne.datasets.sample.data_path()
subjects_dir = os.path.join(data_dir, 'subjects')
annot_path = os.path.join(subjects_dir, '%s', 'label', '%s.%s.annot')
for subject in ['fsaverage', 'sample']:
mne_src = datasets._mne_source_space(subject, 'ico-4', subjects_dir)
vertno = [mne_src[0]['vertno'], mne_src[1]['vertno']]
ss = SourceSpace(vertno, subject, 'ico-4', subjects_dir)
# labels
for hemi_vertices, hemi in izip(ss.vertno, ('lh', 'rh')):
labels, _, names = read_annot(annot_path % (subject, hemi, 'aparc'))
start = 0 if hemi == 'lh' else len(ss.lh_vertno)
hemi_tag = '-' + hemi
for i, v in enumerate(hemi_vertices, start):
label = labels[v]
if label == -1:
eq_(ss.parc[i], 'unknown' + hemi_tag)
else:
eq_(ss.parc[i], names[label] + hemi_tag)
# connectivity
conn = ss.connectivity()
mne_conn = mne.spatial_src_connectivity(mne_src)
assert_array_equal(conn, _matrix_graph(mne_conn))
# sub-space connectivity
sssub = ss[ss.dimindex('superiortemporal-rh')]
ss2 = SourceSpace(vertno, subject, 'ico-4', subjects_dir, 'aparc')
ss2sub = ss2[ss2.dimindex('superiortemporal-rh')]
assert_array_equal(sssub.connectivity(), ss2sub.connectivity())
def read_label(self, hemi, parc_type='aparc'):
"""Read the labels (annotations) for each hemisphere.
Parameters
----------
hemi : str
'lh' or 'rh'
parc_type : str
'aparc', 'aparc.a2009s', 'BA', 'BA.thresh', or 'aparc.DKTatlas40'
'aparc.DKTatlas40' is only for recent freesurfer versions
Returns
-------
numpy.ndarray
value at each vertex, indicating the label
numpy.ndarray
RGB + alpha colors for each label
list of str
names of the labels
"""
parc_file = self.dir / 'label' / (hemi + '.' + parc_type + '.annot')
try:
vert_val, region_color, region_name = read_annot(parc_file)
except NameError:
raise ImportError('nibabel needs to be installed for this function')
region_name = [x.decode('utf-8') for x in region_name]
return vert_val, region_color, region_name
def test_source_space():
"Test SourceSpace dimension"
data_dir = mne.datasets.sample.data_path()
subjects_dir = os.path.join(data_dir, 'subjects')
annot_path = os.path.join(subjects_dir, '%s', 'label', '%s.%s.annot')
for subject in ['fsaverage', 'sample']:
mne_src = datasets._mne_source_space(subject, 'ico-4', subjects_dir)
vertices = [mne_src[0]['vertno'], mne_src[1]['vertno']]
ss = SourceSpace(vertices, subject, 'ico-4', subjects_dir)
# labels
for hemi_vertices, hemi in zip(ss.vertices, ('lh', 'rh')):
labels, _, names = read_annot(annot_path %
(subject, hemi, 'aparc'))
start = 0 if hemi == 'lh' else len(ss.lh_vertices)
hemi_tag = '-' + hemi
for i, v in enumerate(hemi_vertices, start):
label = labels[v]
if label == -1:
assert ss.parc[i] == 'unknown' + hemi_tag
else:
assert ss.parc[i] == names[label].decode() + hemi_tag
# connectivity
conn = ss.connectivity()
mne_conn = mne.spatial_src_connectivity(mne_src)
assert_array_equal(conn, _matrix_graph(mne_conn))
# sub-space connectivity
sssub = ss[ss._array_index('superiortemporal-rh')]
ss2 = SourceSpace(vertices, subject, 'ico-4', subjects_dir, 'aparc')
ss2sub = ss2[ss2._array_index('superiortemporal-rh')]
assert_array_equal(sssub.connectivity(), ss2sub.connectivity())
def read_label(self, hemi, parc_type='aparc'):
"""Read the labels (annotations) for each hemisphere.
Parameters
----------
hemi : str
'lh' or 'rh'
parc_type : str
'aparc', 'aparc.a2009s', 'BA', 'BA.thresh', or 'aparc.DKTatlas40'
'aparc.DKTatlas40' is only for recent freesurfer versions
Returns
-------
numpy.ndarray
value at each vertex, indicating the label
numpy.ndarray
RGB + alpha colors for each label
list of str
names of the labels
"""
parc_file = self.dir / 'label' / (hemi + '.' + parc_type + '.annot')
try:
vert_val, region_color, region_name = read_annot(parc_file)
except NameError:
raise ImportError('nibabel needs to be installed for this function')
region_name = [x.decode('utf-8') for x in region_name]
return vert_val, region_color, region_name
def getannot(annotname):
#initiate DataFrame
#may want to make concatenation/join (instead of append)
#so can have one column per annotation/set of labels
annot_df=[]
for hemi in hemilist:
annot_data=fs.read_annot(
'/Applications/freesurfer/'
'subjects/fsaverage/'
'label/'+
hemi +
'.' +
annotname +
'.annot'
)
annot_hemi=pd.DataFrame(
{"annot_label" : annot_data[0],
"annot_name": annotname,
"vertex_index" : range(
len(annot_data[0])
),
"hemi": hemi_key[hemi]})
annot_df.append(annot_hemi)
annots=pd.concat(annot_df).set_index(
['hemi','vertex_index']
)
return annots
def load_segmentation(filename: str) -> Segmentation:
"""Loads a segmentation from a FreeSurfer annot file.
Loads the a segmentation from a FreeSurfer annotation file. Because annot
files do not have a segmentation name, the file name is used instead.
Args:
filename: The name of the annot file that is loaded.
Returns:
segmentation: A segmentation whose name is `filename`.
"""
keys, ctab, names = nibfs.read_annot(filename)
segmentation = Segmentation(os.path.basename(filename), keys)
def rgbt2rgba(color):
return color[0], color[1], color[2], 255
# Add the label names.
for i, (color, name) in enumerate(zip(ctab, names)):
segmentation.add_label(i, Label(name.decode(), rgbt2rgba(color[:4])))
return segmentation
def extract_time_series(lh_surf,
rh_surf,
lh_annot,
rh_annot,
output_dir,
prefix,
confounds=None,
confoundsName="NoConfs"):
import numpy as np
from connectivityworkflow.surface_processing import extract_hemisphere_time_series
from nibabel.freesurfer import read_annot
from nilearn.surface import load_surf_data
from nilearn.signal import clean
import pandas as pd
import os
from os.path import join as opj
lh_mask, _, lh_names = read_annot(lh_annot)
rh_mask, _, rh_names = read_annot(rh_annot)
lh_names, rh_names = lh_names[1:], rh_names[1:]
lh_surf_data = load_surf_data(lh_surf)
rh_surf_data = load_surf_data(rh_surf)
time_series_lh = extract_hemisphere_time_series(lh_surf_data, lh_mask)
time_series_rh = extract_hemisphere_time_series(rh_surf_data, rh_mask)
time_series = np.concatenate((time_series_lh, time_series_rh)).T
if isinstance(confounds, np.ndarray):
time_series = clean(time_series, confounds=confounds)
to_delete = np.where(time_series.sum(axis=0) == 0)
print("To delete: {}".format(to_delete))
time_series = np.delete(time_series, to_delete, axis=1)
names = [n for i, n in enumerate(lh_names) if i not in to_delete[0]]
#Saving data
time_seriesDF = pd.DataFrame(time_series, columns=names)
#Name of the OutPutFile
directory = opj(output_dir, "time_series")
if not os.path.exists(directory):
try:
os.makedirs(directory)
except Exception:
print("exception makedirs")
outFile = os.path.join(directory,
prefix + confoundsName + "TimeSeriesRoI.tsv")
time_seriesDF.to_csv(outFile, sep="\t", index=False)
return time_series, names, confoundsName
def plot_surf(stc,
clim,
colormap,
time_label,
surf,
transparent,
offscreen,
subjects_dir=None,
blnMaskUnknown=False):
if offscreen:
# create offscreen figure so that I can use the computer while it's saving
from surfer.viz import _make_viewer
figure = _make_viewer(None, 1, 2, stc.subject, (800, 1600), True)[0][0]
else:
figure = None
# This raises a vtk error that has something to do with smoothing_steps=None
# (any time smoothing steps is big enough to cover all of the vertices)
# but it still displays the correct figure.
# can't catch the error since it's in c, printing to console.
brain = stc.plot(surface=surf,
hemi='split',
views='medial',
clim=clim,
colormap=colormap,
transparent=transparent,
time_unit='s',
time_label=time_label,
size=[1600, 800],
figure=figure,
smoothing_steps=None,
subjects_dir=subjects_dir)
if blnMaskUnknown:
subjects_dir = mne.utils.get_subjects_dir(subjects_dir=subjects_dir,
raise_error=True)
for hemi in ['lh', 'rh']:
aparc_file = op.join(subjects_dir, stc.subject, "label",
'{}.aparc.annot'.format(hemi))
labels, _, names = fs.read_annot(aparc_file)
masked_region_inds = np.arange(len(names))[np.in1d(
names, ['corpuscallosum', 'unknown'])]
masked_region_inds = np.append(masked_region_inds, -1) # unlabeled
mask = np.in1d(labels, masked_region_inds)
brain.add_data(mask,
hemi=hemi,
min=0,
max=1,
thresh=0.5,
colormap='gray',
colorbar=False,
alpha=0.99)
return brain
def loadAnnotation(pathToAnnotation):
'''
This loads an annotation file. Format is:
[0] - vector of values (len#verteces)
[1] - coordinates of annotations... (not sure)
[2] - list of names for annotations
'''
annot = nfs.read_annot(pathToAnnotation)
return annot
def annot_legend(lh, rh, *args, **kwargs):
"""Plot a legend for a freesurfer parcellation
Parameters
----------
lh : str
Path to the lh annot-file.
rh : str
Path to the rh annot-file.
Returns
-------
legend : plot.ColorList
ColorList figure with legend for the parcellation.
"""
_, lh_colors, lh_names = read_annot(lh)
_, rh_colors, rh_names = read_annot(rh)
lh_colors = dict(izip(lh_names, lh_colors[:, :4] / 255.0))
rh_colors = dict(izip(rh_names, rh_colors[:, :4] / 255.0))
names = set(lh_names)
names.update(rh_names)
colors = {}
seq = [] # sequential order in legend
seq_lh = []
seq_rh = []
for name in names:
if name in lh_colors and name in rh_colors:
if np.array_equal(lh_colors[name], rh_colors[name]):
colors[name] = lh_colors[name]
seq.append(name)
else:
colors[name + "-lh"] = lh_colors[name]
colors[name + "-rh"] = rh_colors[name]
seq_lh.append(name + "-lh")
seq_rh.append(name + "-rh")
elif name in lh_colors:
colors[name + "-lh"] = lh_colors[name]
seq_lh.append(name + "-lh")
else:
colors[name + "-rh"] = rh_colors[name]
seq_rh.append(name + "-rh")
return ColorList(colors, seq + seq_lh + seq_rh, *args, **kwargs)
def loadVertexDataFile(infile):
"""Loads the given Freesurfer vertex data, label, or annotation file.
This function return different things depending on what ``infile`` is:
- If ``infile`` is a vertex data file, a ``(nvertices,)`` array is
returned, containing one value for each vertex in the mesh.
- If ``infile`` is a ``mgh``/``mgz`` file, the image data is returned
as-is, with dimensions of length 1 squeezed out (under the assumption
that the image contains scalar vertex data).
- If ``infile`` is a vertex label file, a tuple containing the following
is returned:
- a ``(n,)`` array, containing the indices of all vertices that are
specified in the file.
- a ``(n,)`` array, containing scalar value for each vertex
- If ``infile`` is a vertex annotation file, a tuple containing the
following is returned:
- a ``(n,)`` array containing the indices of all ``n`` vertices that
are specified in the file.
- a ``(l, 5)`` array containing the RGBA colour, and the label value,
for every label that is specified in the file.
- A list of length ``l``, containing the names of every label that is
specified in the file.
"""
if isVertexDataFile(infile):
return nibfs.read_morph_data(infile)
elif isVertexLabelFile(infile):
return nibfs.read_label(infile, read_scalars=True)
elif isVertexAnnotFile(infile):
# nibabel 2.2.1 is broken w.r.t. .annot files.
# raise ValueError('.annot files are not yet supported')
labels, lut, names = nibfs.read_annot(infile, orig_ids=False)
return labels, lut, names
elif isVertexMGHFile(infile):
return fslmgh.MGHImage(infile)[:].squeeze()
else:
raise ValueError('Unrecognised freesurfer '
'file type: {}'.format(infile))
def fix_annot_names(subject,
parc,
clean_subject=None,
clean_parc=None,
hemi='both',
subjects_dir=None):
"""Fix for Freesurfer's mri_surf2surf corrupting label names in annot files
Notes
-----
Requires nibabel > 1.3.0 for annot file I/O
"""
# process args
subjects_dir = get_subjects_dir(subjects_dir)
if clean_subject is None:
clean_subject = subject
if clean_parc is None:
clean_parc = parc
fpaths, hemis = _get_annot_fname(None, subject, hemi, parc, subjects_dir)
clean_fpaths, _ = _get_annot_fname(None, clean_subject, hemi, clean_parc,
subjects_dir)
for fpath, clean_fpath, hemi in zip(fpaths, clean_fpaths, hemis):
labels, ctab, names = read_annot(fpath)
_, _, clean_names = read_annot(clean_fpath)
if all(n == nc for n, nc in zip(names, clean_names)):
continue
if len(clean_names) != len(names):
err = ("Different names in %s annot files: %s vs. "
"%s" % (hemi, str(names), str(clean_names)))
raise ValueError(err)
for clean_name, name in zip(clean_names, names):
if not name.startswith(clean_name):
err = "%s does not start with %s" % (str(name), clean_name)
raise ValueError(err)
write_annot(fpath, labels, ctab, clean_names)
def load(self, meshfile, inflatedmeshpath=None, annotfile=None):
""" Load a FreeSurfer surface.
Parameters
----------
meshfile: str (mandatory)
the location of the file containing the FreeSurfer mesh to be
loaded.
inflatedmeshpath: str (optional, default None)
the location of the file containing the FreeSurfer inflated mesh
to be loaded.
annotfile: str (optional, default None)
the location of the file containing the FreeSurfer annotations to
be loaded.
Returns
-------
surf: TriSurface
a triangular surface representation.
"""
vertices, triangles = freesurfer.read_geometry(meshfile)
if inflatedmeshpath is not None:
inflated_vertices, _triangles = freesurfer.read_geometry(
inflatedmeshpath)
if not numpy.allclose(triangles, _triangles):
raise ValueError("'{0}' and '{1}' do not represent the same "
"surface.".format(meshfile, inflatedmeshpath))
else:
inflated_vertices = None
if annotfile is not None:
labels, ctab, regions = freesurfer.read_annot(annotfile,
orig_ids=False)
meta = dict((index, {
"region": item[0],
"color": item[1][:4].tolist()
}) for index, item in enumerate(zip(regions, ctab)))
else:
labels = None
meta = None
return TriSurface(vertices=vertices,
triangles=triangles,
labels=labels,
metadata=meta,
inflated_vertices=inflated_vertices)
def plot_fragment(frag_file, filename, fpath_sphere, surface):
"""
Plot fragmented region on specific surface
"""
# Load labels of new fragmented annotation
labels, _, _ = freesurfer.read_annot(frag_file)
# Specify on which surface to plot
surf_type = fpath_sphere.replace('.sphere', '.%s' % surface)
# Plot fragmented region on surface with colored annotation
plot_surf_roi(surf_type,
roi_map=labels,
hemi='left',
view='lateral',
cmap='Spectral',
output_file=filename)
def load_data(self, filename):
""" Load the data from a surface scalar file
Parameters
----------
filename: str
Pathstr to a surface scalar file
Returns
-------
self: a Surface obejct
"""
if filename.endswith(('.curv', '.sulc', '.volume', '.thickness', '.area')):
data = np.expand_dims(freesurfer.read_morph_data(filename), axis=-1)
elif filename.endswith(('.shape.gii', '.func.gii')):
data = np.expand_dims(nib.load(filename).darrays[0].data, axis=-1)
elif filename.endswith(('.mgz', '.mgh')):
data = nib.load(filename).get_data()
data = data.reshape((data.shape[0], data.shape[-1]))
elif filename.endswith(('.dscalar.nii', '.dseries.nii')):
data = nib.load(filename).get_data()
data = data.T
elif filename.endswith('.label.gii'):
data = np.expand_dims(nib.load(filename).darrays[0].data, axis=-1)
elif filename.endswith('.dlabel.nii'):
data = nib.load(filename).get_data().T
elif filename.endswith('.label'):
data = np.expand_dims(freesurfer.read_label(filename), axis=-1)
elif filename.endswith('.annot'):
data, _, _ = freesurfer.read_annot(filename)
else:
suffix = os.path.split(filename)[1].split('.')[-1]
raise ImageFileError('This file format-{} is not supported at present.'.format(suffix))
self.data = data
def label_from_annot(sss, subject, subjects_dir, parc=None, color=(0, 0, 0)):
"""Label for known regions of a source space
Parameters
----------
sss : mne.SourceSpaces
Source space.
subject : str
MRI-subject.
subjects_dir : str
MRI subjects-directory.
parc : str
Parcellation name.
color : matplotlib color
Label color.
Returns
-------
label : mne.Label
Label encompassing known regions of ``parc`` in ``sss``.
"""
fname = SourceSpace._ANNOT_PATH.format(subjects_dir=subjects_dir,
subject=subject,
hemi='%s',
parc=parc)
# find vertices for each hemisphere
labels = []
for hemi, ss in zip(('lh', 'rh'), sss):
annotation, _, names = read_annot(fname % hemi)
bad = [-1, names.index(b'unknown')]
keep = ~np.in1d(annotation[ss['vertno']], bad)
if np.any(keep):
label = mne.Label(ss['vertno'][keep], hemi=hemi, color=color)
labels.append(label)
# combine hemispheres
if len(labels) == 2:
lh, rh = labels
return lh + rh
elif len(labels) == 1:
return labels.pop(0)
else:
raise RuntimeError("No vertices left")
def find_fsaverage_centroids(lhannot, rhannot, surf='sphere'):
"""
Finds vertices corresponding to centroids of parcels in annotation files
Note that using any other `surf` besides the default of 'sphere' may result
in centroids that are not directly within the parcels themselves due to
sulcal folding patterns.
Parameters
----------
{lh,rh}annot : str
Path to .annot file containing labels to parcels on the {left,right}
hemisphere. Switching the order of inputs (i.e., providing right before
left) is perfectly reasonable, if desired.
surf : str, optional
Surface on which to find parcel centroids. Default: 'sphere'
Returns
-------
centroids : (N, 3) numpy.ndarray
xyz coordinates of vertices closest to the centroid of each parcel
defined in `lhannot` and `rhannot`
hemiid : (N,) numpy.ndarray
Array denoting hemisphere designation of coordinates in `centroids`,
where `hemiid=0` denotes the left and `hemiid=1` the right hemisphere
"""
surfaces = fetch_fsaverage()[surf]
centroids, hemiid = [], []
for n, (annot, surf) in enumerate(zip([lhannot, rhannot], surfaces)):
vertices, faces = read_geometry(surf)
labels, ctab, names = read_annot(annot)
for lab in np.unique(labels):
if b'corpuscallosum' in names[lab] or b'unknown' in names[lab]:
continue
coords = np.atleast_2d(vertices[labels == lab].mean(axis=0))
roi = vertices[np.argmin(cdist(vertices, coords), axis=0)[0]]
centroids.append(roi)
hemiid.append(n)
return np.row_stack(centroids), np.asarray(hemiid)
def get_roi_mask(roi_idx, fpath_annot):
"""
Creates a region mask specifying which vertexes to consider
"""
# Load annotation file
roi_labels, _, roi_names = freesurfer.read_annot(fpath_annot)
# Get index of rois to consider
roi_index = [roi_names.index(np.bytes_(n)) for n in roi_idx]
# Create vertex mask
roi_mask = np.isin(roi_labels, np.array(roi_index))
# Take all regions if none specified
if roi_mask.sum() == 0:
roi_mask = np.invert(roi_mask)
return roi_mask
def load(self, meshfile, inflatedmeshpath=None, annotfile=None):
""" Load a FreeSurfer surface.
Parameters
----------
meshfile: str (mandatory)
the location of the file containing the FreeSurfer mesh to be
loaded.
inflatedmeshpath: str (optional, default None)
the location of the file containing the FreeSurfer inflated mesh
to be loaded.
annotfile: str (optional, default None)
the location of the file containing the FreeSurfer annotations to
be loaded.
Returns
-------
surf: TriSurface
a triangular surface representation.
"""
vertices, triangles = freesurfer.read_geometry(meshfile)
if inflatedmeshpath is not None:
inflated_vertices, _triangles = freesurfer.read_geometry(
inflatedmeshpath)
if not numpy.allclose(triangles, _triangles):
raise ValueError("'{0}' and '{1}' do not represent the same "
"surface.".format(meshfile, inflatedmeshpath))
else:
inflated_vertices = None
if annotfile is not None:
labels, ctab, regions = freesurfer.read_annot(
annotfile, orig_ids=False)
meta = dict(
(index, {"region": item[0], "color": item[1][:4].tolist()})
for index, item in enumerate(zip(regions, ctab)))
else:
labels = None
meta = None
return TriSurface(vertices=vertices, triangles=triangles,
labels=labels, metadata=meta,
inflated_vertices=inflated_vertices)
def label_from_annot(sss, subject, subjects_dir, parc=None, color=(0, 0, 0)):
"""Label for known regions of a source space
Parameters
----------
sss : mne.SourceSpaces
Source space.
subject : str
MRI-subject.
subjects_dir : str
MRI subjects-directory.
parc : str
Parcellation name.
color : matplotlib color
Label color.
Returns
-------
label : mne.Label
Label encompassing known regions of ``parc`` in ``sss``.
"""
fname = SourceSpace._ANNOT_PATH.format(subjects_dir=subjects_dir, subject=subject, hemi='%s', parc=parc)
# find vertices for each hemisphere
labels = []
for hemi, ss in zip(('lh', 'rh'), sss):
annotation, _, names = read_annot(fname % hemi)
bad = [-1, names.index(b'unknown')]
keep = ~np.in1d(annotation[ss['vertno']], bad)
if np.any(keep):
label = mne.Label(ss['vertno'][keep], hemi=hemi, color=color)
labels.append(label)
# combine hemispheres
if len(labels) == 2:
lh, rh = labels
return lh + rh
elif len(labels) == 1:
return labels.pop(0)
else:
raise RuntimeError("No vertices left")
def read_cortex_surface_segmentation(fsdir, physical_to_index, fsconfig,
affine=None):
""" Read the cortex gyri surface segmentatation of freesurfer.
Give access to the right and left hemisphere segmentations that can be
projected on the cortical and inflated cortical surfaces.
The vertex are expressed in the voxel coordinates.
Parameters
----------
fsdir: str( mandatory)
the subject freesurfer segmentation directory.
physical_to_index: array (mandatory)
the transformation to project a physical point in an array.
fsconfig: str (mandatory)
the freesurfer configuration file.
affine: array (optional, default None)
an affine transformation in voxel coordinates that will be applied on
the output vertex of the cortex surface.
Returns
-------
segmentation: dict
contain the two hemisphere 'lh' and 'rh' triangular surfaces and
inflated surfaces represented in a TriSurface structure.
"""
# Construct the path to the surface segmentation results and associated
# labels
meshdir = os.path.join(fsdir, "surf")
labeldir = os.path.join(fsdir, "label")
segfile = os.path.join(fsdir, "mri")
# Get deformation between the ras and ras-tkregister spaces
asegfile = os.path.join(segfile, "aseg.mgz")
translation = tkregister_translation(asegfile, fsconfig)
# Construct the deformation to apply on the cortex mesh
if affine is None:
affine = numpy.identity(4)
deformation = numpy.dot(affine, numpy.dot(physical_to_index, translation))
# Create an dictionary to contain all the surfaces and labels
segmentation = {}
# Select the hemisphere
for hemi in ["lh", "rh"]:
# Get annotation id at each vertex (if a vertex does not belong
# to any label and orig_ids=False, its id will be set to -1) and
# the names of the labels
annotfile = os.path.join(labeldir, "{0}.aparc.annot".format(hemi))
labels, ctab, regions = freesurfer.read_annot(
annotfile, orig_ids=False)
meta = dict((index, {"region": item[0], "color": item[1][:4].tolist()})
for index, item in enumerate(zip(regions, ctab)))
# Select the surface type
hemisegmentation = {}
for surf in ["white", "inflated"]:
# Load the mesh: a 2-uplet with vertex (x, y, z) coordinates and
# mesh triangles
meshfile = os.path.join(meshdir, "{0}.{1}".format(hemi, surf))
mesh = freesurfer.read_geometry(meshfile)
hemisegmentation[surf] = {
"vertices": apply_affine_on_mesh(mesh[0], deformation),
"triangles": mesh[1]
}
# Save the segmentation result
segmentation[hemi] = TriSurface(
vertices=hemisegmentation["white"]["vertices"],
inflated_vertices=hemisegmentation["inflated"]["vertices"],
triangles=hemisegmentation["white"]["triangles"],
labels=labels,
metadata=meta)
return segmentation
def reduce_from_vertices(data, rhannot, lhannot):
"""
Reduces vertex-level `data` to parcels defined in annotation files
Takes average of vertices within each parcel, excluding np.nan values
(i.e., np.nanmean). Assigns np.nan to parcels for which all vertices are
np.nan.
Parameters
----------
data : (N,) numpy.ndarray
Vertex-level data to be reduced to parcels
{rh,lh}annot : str
Path to .annot file containing labels to parcels on the {right,left}
hemisphere
Reurns
------
reduced : numpy.ndarray
Parcellated data
"""
drop = [b'unknown', b'corpuscallosum']
start = end = 0
reduced = []
# check this so we're not unduly surprised by anything...
expected = sum([len(read_annot(a)[0]) for a in [rhannot, lhannot]])
if expected != len(data):
raise ValueError('Number of vertices in provided annotation files '
'differs from size of vertex-level data array.\n'
' EXPECTED: {} vertices\n'
' RECEIVED: {} vertices'.format(
expected, len(data)))
for annot in [rhannot, lhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
end += len(labels)
# get average of vertex-level data within parcels
# set all NaN values to 0 before calling `_stats` because we are
# returning sums, so the 0 values won't impact the sums (if we left
# the NaNs then all parcels with a single NaN value would be NaN)
currdata = data[start:end].copy()
isna = np.isnan(currdata)
currdata[isna] = 0
counts, sums = _stats(currdata, labels, np.unique(labels))
# however, we do need to account for the NaN values in the counts
# so that our means are similar to what we'd get from e.g., np.nanmean
# here, our "sums" are the counts of NaN values in our parcels
_, nacounts = _stats(isna, labels, np.unique(labels))
counts = (np.asanyarray(counts).astype(float) -
np.asanyarray(nacounts).astype(float))
with np.errstate(divide='ignore', invalid='ignore'):
currdata = sums / counts
# get indices of unkown and corpuscallosum and delete from parcels
inds = [names.index(f) for f in drop]
currdata = np.delete(currdata, inds)
# store parcellated data
reduced.append(currdata)
start = end
return np.hstack(reduced)
data_file = jf['data_file']
# Load DataFrame
df = pd.read_csv(data_file)
# Load random subject
i = np.random.randint(1, 10)
img_dir = os.path.join(dataset_folder, df['folder'].iloc[i], 'mri',
'brainmask.mgz')
img = nb.load(img_dir)
print('[ OK ] Image loaded')
# Load annotations
annot_path = os.path.join(dataset_folder, df['folder'].iloc[i], 'label',
'lh.aparc.annot')
labels, ctab, names = nbfs.read_annot(annot_path)
print('[ OK ] Annotations file loaded')
# Load thickness
tk_path = os.path.join(dataset_folder, df['folder'].iloc[i], 'surf',
'lh.thickness')
tk = nbfs.read_morph_data(tk_path)
print('[ OK ] Thickness file loaded')
#
regions = pd.DataFrame({
key: val
for (key, val) in zip(names, np.linspace(-1, 36, 37, dtype=int))
})
# data = {annot[0]: tk}
def map_to_average_brain(coords, left_pial, right_pial, left_sphere,
right_sphere):
"""
Maps a set of Freesurfer surface coordinates in an individual brain to the equivalent coordinates on the average
brain.
Method taken from the iElvis project (http://ielvis.pbworks.com), which implemented the same function in MATLAB:
https://github.com/iELVis/iELVis/blob/master/iELVis_MAIN/iELVis_MATLAB/ELEC_LOC/sub2AvgBrain.m
:param coords: {np.ndarray} Coordinates in the individual Freesurfer space
:param subject_surf_dir: {str} Path to the directory containing the subject's surface meshes
:param avg_surf_dir: {str} Path to the directory containing the fsaverage surface meshes
:return: {np.ndarray} The matching coordinates in the average brain
:return: {np.ndarray} The corresponding atlas labels in the average brain
"""
hemispheres = [
'left', 'right'
] # For all surfaces, we append the right hemisphere to the left hemisphere
fsavg_subj_dir = osp.join(
paths.rhino_root,
'data',
'eeg',
'freesurfer',
'subjects',
'fsaverage',
)
files = {
'left_pial': left_pial,
'right_pial': right_pial,
'left_sphere': left_sphere,
'right_sphere': right_sphere,
'left_avg_sphere': osp.join(fsavg_subj_dir, 'surf', 'lh.sphere.reg'),
'right_avg_sphere': osp.join(fsavg_subj_dir, 'surf', 'rh.sphere.reg'),
'left_avg_pial': osp.join(fsavg_subj_dir, 'surf', 'lh.pial'),
'right_avg_pial': osp.join(fsavg_subj_dir, 'surf', 'rh.pial'),
'left_avg_annot': osp.join(fsavg_subj_dir, 'label', 'lh.aparc.annot'),
'right_avg_annot': osp.join(fsavg_subj_dir, 'label', 'rh.aparc.annot')
}
# Find vertex indices on subject's pial surface
pial_verts = [read_geometry(files['%s_pial' % h])[0] for h in hemispheres]
distances = [dist.cdist(v, coords) for v in pial_verts]
hemisphere = np.min(distances[0], 0) < np.min(distances[1], 0)
pial_indices = [np.argmin(d, 0) for d in distances]
# Take those vertices in sphere.reg
sphere_verts = [
read_geometry(files['%s_sphere' % h])[0] for h in hemispheres
]
electrode_sphere_verts = [
sv[pi] for (sv, pi) in zip(sphere_verts, pial_indices)
]
# Find indices of nearest vertices in fsaverage.?h.sphere.reg
avg_sphere_verts = [
read_geometry(files['%s_avg_sphere' % h])[0] for h in hemispheres
]
avg_sphere_indices = [
np.argmin(dist.cdist(asv, esv), axis=0)
for (asv, esv) in zip(avg_sphere_verts, electrode_sphere_verts)
]
# Take those vertices on average pial surface
avg_pial_verts = [
read_geometry(files['%s_avg_pial' % h])[0] for h in hemispheres
]
avg_pial_inds, _, avg_pial_labels = list(
zip(*[read_annot(files['%s_avg_annot' % h]) for h in hemispheres]))
avg_pial_labels = [np.array(x) for x in avg_pial_labels]
new_pial_verts = np.where(
hemisphere[:, None],
*[apv[asi] for apv, asi in zip(avg_pial_verts, avg_sphere_indices)])
new_pial_labels = np.where(
hemisphere, *[
np.array(apl)[(api[asi])] for apl, api, asi in zip(
avg_pial_labels, avg_pial_inds, avg_sphere_indices)
])
print((new_pial_verts.shape))
print((new_pial_labels.shape))
return new_pial_verts, new_pial_labels
def spin_parcels(*,
lhannot,
rhannot,
version='fsaverage',
n_rotate=1000,
spins=None,
drop=None,
verbose=False,
**kwargs):
"""
Rotates parcels in `{lh,rh}annot` and re-assigns based on maximum overlap
Vertex labels are rotated with :func:`netneurotools.stats.gen_spinsamples`
and a new label is assigned to each *parcel* based on the region maximally
overlapping with its boundaries.
Parameters
----------
{lh,rh}annot : str
Path to .annot file containing labels to parcels on the {left,right}
hemisphere
version : str, optional
Specifies which version of `fsaverage` provided annotation files
correspond to. Must be one of {'fsaverage', 'fsaverage3', 'fsaverage4',
'fsaverage5', 'fsaverage6'}. Default: 'fsaverage'
n_rotate : int, optional
Number of rotations to generate. Default: 1000
spins : array_like, optional
Pre-computed spins to use instead of generating them on the fly. If not
provided will use other provided parameters to create them. Default:
None
drop : list, optional
Specifies regions in {lh,rh}annot that are not present in `data`. NaNs
will be inserted in place of the these regions in the returned data. If
not specified, parcels defined in `netneurotools.freesurfer.FSIGNORE`
are assumed to not be present. Default: None
seed : {int, np.random.RandomState instance, None}, optional
Seed for random number generation. Default: None
verbose : bool, optional
Whether to print occasional status messages. Default: False
return_cost : bool, optional
Whether to return cost array (specified as Euclidean distance) for each
coordinate for each rotation. Default: True
kwargs : key-value pairs
Keyword arguments passed to `netneurotools.stats.gen_spinsamples`
Returns
-------
spinsamples : (N, `n_rotate`) numpy.ndarray
Resampling matrix to use in permuting data parcellated with labels from
{lh,rh}annot, where `N` is the number of parcels. Indices of -1
indicate that the parcel was completely encompassed by regions in
`drop` and should be ignored.
cost : (N, `n_rotate`,) numpy.ndarray
Cost (specified as Euclidean distance) of re-assigning each coordinate
for every rotation in `spinsamples`. Only provided if `return_cost` is
True.
"""
def overlap(vals):
""" Returns most common non-negative value in `vals`; -1 if all neg
"""
vals = np.asarray(vals)
vals, counts = np.unique(vals[vals > 0], return_counts=True)
try:
return vals[counts.argmax()]
except ValueError:
return -1
if drop is None:
drop = FSIGNORE
drop = _decode_list(drop)
# get vertex-level labels (set drop labels to - values)
vertices, end = [], 0
for n, annot in enumerate([lhannot, rhannot]):
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
todrop = set(names) & set(drop)
inds = [names.index(f) - n for n, f in enumerate(todrop)]
labs = np.arange(len(names) - len(inds)) + (end - (len(inds) * n))
insert = np.arange(-1, -(len(inds) + 1), -1)
vertices.append(np.insert(labs, inds, insert)[labels])
end += len(names)
vertices = np.hstack(vertices)
labels = np.unique(vertices)
mask = labels > -1
# get spins + cost (if requested)
spins, cost = _get_fsaverage_spins(version=version,
spins=spins,
n_rotate=n_rotate,
verbose=verbose,
**kwargs)
if len(vertices) != len(spins):
raise ValueError('Provided annotation files have a different '
'number of vertices than the specified fsaverage '
'surface.\n ANNOTATION: {} vertices\n '
'FSAVERAGE: {} vertices'.format(
len(vertices), len(spins)))
# spin and assign regions based on max overlap
regions = np.zeros((len(labels[mask]), n_rotate), dtype='int32')
for n in range(n_rotate):
if verbose:
msg = f'Calculating parcel overlap: {n:>5}/{n_rotate}'
print(msg, end='\b' * len(msg), flush=True)
regions[:, n] = labeled_comprehension(vertices[spins[:, n]], vertices,
labels, overlap, int, -1)[mask]
if kwargs.get('return_cost'):
return regions, cost
return regions
def vertices_to_parcels(data, *, lhannot, rhannot, drop=None):
"""
Reduces vertex-level `data` to parcels defined in annotation files
Takes average of vertices within each parcel, excluding np.nan values
(i.e., np.nanmean). Assigns np.nan to parcels for which all vertices are
np.nan.
Parameters
----------
data : (N,) numpy.ndarray
Vertex-level data to be reduced to parcels
{lh,rh}annot : str
Path to .annot file containing labels to parcels on the {left,right}
hemisphere
drop : list, optional
Specifies regions in {lh,rh}annot that should be removed from the
parcellated version of `data`. If not specified, vertices corresponding
to parcels defined in `netneurotools.freesurfer.FSIGNORE` will be
removed. Default: None
Reurns
------
reduced : numpy.ndarray
Parcellated `data`, without regions specified in `drop`
"""
if drop is None:
drop = FSIGNORE
drop = _decode_list(drop)
data = np.vstack(data)
n_parc = expected = 0
for a in [lhannot, rhannot]:
vn, _, names = read_annot(a)
expected += len(vn)
names = _decode_list(names)
n_parc += len(names) - len(set(drop) & set(names))
if expected != len(data):
raise ValueError('Number of vertices in provided annotation files '
'differs from size of vertex-level data array.\n'
' EXPECTED: {} vertices\n'
' RECEIVED: {} vertices'.format(
expected, len(data)))
reduced = np.zeros((n_parc, data.shape[-1]), dtype=data.dtype)
start = end = n_parc = 0
for annot in [lhannot, rhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
indices = np.unique(labels)
end += len(labels)
for idx in range(data.shape[-1]):
# get average of vertex-level data within parcels
# set all NaN values to 0 before calling `_stats` because we are
# returning sums, so the 0 values won't impact the sums (if we left
# the NaNs then all parcels with even one NaN entry would be NaN)
currdata = np.squeeze(data[start:end, idx])
isna = np.isnan(currdata)
counts, sums = _stats(np.nan_to_num(currdata), labels, indices)
# however, we do need to account for the NaN values in the counts
# so that our means are similar to what we'd get from e.g.,
# np.nanmean here, our "sums" are the counts of NaN values in our
# parcels
_, nacounts = _stats(isna, labels, indices)
counts = (np.asanyarray(counts, dtype=float) -
np.asanyarray(nacounts, dtype=float))
with np.errstate(divide='ignore', invalid='ignore'):
currdata = sums / counts
# get indices of unkown and corpuscallosum and delete from parcels
inds = sorted([names.index(f) for f in set(drop) & set(names)])
currdata = np.delete(currdata, inds)
# store parcellated data
reduced[n_parc:n_parc + len(names) - len(inds), idx] = currdata
start = end
n_parc += len(names) - len(inds)
return np.squeeze(reduced)
def parcels_to_vertices(data, *, lhannot, rhannot, drop=None):
"""
Projects parcellated `data` to vertices defined in annotation files
Assigns np.nan to all ROIs in `drop`
Parameters
----------
data : (N,) numpy.ndarray
Parcellated data to be projected to vertices. Parcels should be ordered
by [left, right] hemisphere; ordering within hemisphere should
correspond to the provided annotation files.
{lh,rh}annot : str
Path to .annot file containing labels of parcels on the {left,right}
hemisphere. These must be specified as keyword arguments to avoid
accidental order switching.
drop : list, optional
Specifies regions in {lh,rh}annot that are not present in `data`. NaNs
will be inserted in place of the these regions in the returned data. If
not specified, parcels defined in `netneurotools.freesurfer.FSIGNORE`
are assumed to not be present. Default: None
Reurns
------
projected : numpy.ndarray
Vertex-level data
"""
if drop is None:
drop = FSIGNORE
drop = _decode_list(drop)
data = np.vstack(data).astype(float)
# check this so we're not unduly surprised by anything...
n_vert = expected = 0
for a in [lhannot, rhannot]:
vn, _, names = read_annot(a)
n_vert += len(vn)
names = _decode_list(names)
expected += len(names) - len(set(drop) & set(names))
if expected != len(data):
raise ValueError('Number of parcels in provided annotation files '
'differs from size of parcellated data array.\n'
' EXPECTED: {} parcels\n'
' RECEIVED: {} parcels'.format(
expected, len(data)))
projected = np.zeros((n_vert, data.shape[-1]), dtype=data.dtype)
start = end = n_vert = 0
for annot in [lhannot, rhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
todrop = set(names) & set(drop)
end += len(names) - len(todrop) # unknown and corpuscallosum
# get indices of unknown and corpuscallosum and insert NaN values
inds = sorted([names.index(f) for f in todrop])
inds = [f - n for n, f in enumerate(inds)]
currdata = np.insert(data[start:end], inds, np.nan, axis=0)
# project to vertices and store
projected[n_vert:n_vert + len(labels), :] = currdata[labels]
start = end
n_vert += len(labels)
return np.squeeze(projected)
def find_parcel_centroids(*,
lhannot,
rhannot,
method='surface',
version='fsaverage',
surf='sphere',
drop=None):
"""
Returns vertex coords corresponding to centroids of parcels in annotations
Note that using any other `surf` besides the default of 'sphere' may result
in centroids that are not directly within the parcels themselves due to
sulcal folding patterns.
Parameters
----------
{lh,rh}annot : str
Path to .annot file containing labels of parcels on the {left,right}
hemisphere. These must be specified as keyword arguments to avoid
accidental order switching.
method : {'average', 'surface', 'geodesic'}, optional
Method for calculation of parcel centroid. See Notes for more
information. Default: 'surface'
version : str, optional
Specifies which version of `fsaverage` provided annotation files
correspond to. Must be one of {'fsaverage', 'fsaverage3', 'fsaverage4',
'fsaverage5', 'fsaverage6'}. Default: 'fsaverage'
surf : str, optional
Specifies which surface projection of fsaverage to use for finding
parcel centroids. Default: 'sphere'
drop : list, optional
Specifies regions in {lh,rh}annot for which the parcel centroid should
not be calculated. If not specified, centroids for parcels defined in
`netneurotools.freesurfer.FSIGNORE` are not calculated. Default: None
Returns
-------
centroids : (N, 3) numpy.ndarray
xyz coordinates of vertices closest to the centroid of each parcel
defined in `lhannot` and `rhannot`
hemiid : (N,) numpy.ndarray
Array denoting hemisphere designation of coordinates in `centroids`,
where `hemiid=0` denotes the left and `hemiid=1` the right hemisphere
Notes
-----
The following methods can be used for finding parcel centroids:
1. ``method='average'``
Uses the arithmetic mean of the coordinates for the vertices in each
parcel. Note that in this case the calculated centroids will not act
actually fall on the surface of `surf`.
2. ``method='surface'``
Calculates the 'average' coordinates and then finds the closest vertex
on `surf`, where closest is defined as the vertex with the minimum
Euclidean distance.
3. ``method='geodesic'``
Uses the coordinates of the vertex with the minimum average geodesic
distance to all other vertices in the parcel. Note that this is slightly
more time-consuming than the other two methods, especially for
high-resolution meshes.
"""
methods = ['average', 'surface', 'geodesic']
if method not in methods:
raise ValueError('Provided method for centroid calculation {} is '
'invalid. Must be one of {}'.format(methods, methods))
if drop is None:
drop = FSIGNORE
drop = _decode_list(drop)
surfaces = fetch_fsaverage(version)[surf]
centroids, hemiid = [], []
for n, (annot, surf) in enumerate(zip([lhannot, rhannot], surfaces)):
vertices, faces = read_geometry(surf)
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
for lab in np.unique(labels):
if names[lab] in drop:
continue
if method in ['average', 'surface']:
roi = np.atleast_2d(vertices[labels == lab].mean(axis=0))
if method == 'surface': # find closest vertex on the sphere
roi = vertices[np.argmin(cdist(vertices, roi), axis=0)[0]]
elif method == 'geodesic':
inds, = np.where(labels == lab)
roi = _geodesic_parcel_centroid(vertices, faces, inds)
centroids.append(roi)
hemiid.append(n)
return np.row_stack(centroids), np.asarray(hemiid)
def display_pits_parcellation(white_file,
parcellation_file,
labels=None,
pits_file=None,
parcellation_as_annotation=False,
interactive=True,
snap=False,
animate=False,
outdir=None,
name="pits_parcellation",
actor_ang=(0., 0., 0.)):
""" Display the pits parcellation.
The scene supports one feature activated via the keystroke:
* 'p': Pick the data at the current mouse point. This will pop-up a window
with information on the current pick (ie. the areal name).
Parameters
----------
white_file: str
the white surface that will be displayed.
parcellation_file: str
the parcellation texture file.
labels: dict, default None
a mapping between an areal number and its name.
pits_file: str, default None
if specified the PITS locations.
parcellation_as_annotation: bool, default False
if set expect a FreeSurfer annotation file as a parcellation input.
interactive: bool, default True
if True display the renderer.
snap: bool, default False
if True create a snap of the scene: need a valid outdir.
animate: bool, default False
if True create a gif 360 degrees animation of the scene: need a valid
outdir.
outdir: str, default None
an existing directory.
name: str, default 'pits_parcellation'
the basename of the generated files.
actor_ang: 3-uplet, default (0, 0, 0)
the actors x, y, z position (in degrees).
"""
# Load the PITS if specified
if pits_file is not None:
image = gio.read(pits_file)
nb_of_surfs = len(image.darrays)
if nb_of_surfs != 1:
raise ValueError("'{0}' does not a contain a valid pits "
"texture.".format(pits_file))
pits_texture = image.darrays[0].data
else:
pits_texture = None
# Create an actor for the white matter surface
ren = pvtk.ren()
ren.SetBackground(1, 1, 1)
if white_file.endswith(".gii"):
image = gio.read(white_file)
nb_of_surfs = len(image.darrays)
if nb_of_surfs != 2:
raise ValueError("'{0}' does not a contain a valid white "
"mesh.".format(white_file))
vertices = image.darrays[0].data
triangles = image.darrays[1].data
else:
_surf = TriSurface.load(white_file)
vertices = _surf.vertices
triangles = _surf.triangles
if parcellation_as_annotation:
annotations = fio.read_annot(parcellation_file)
texture, _, labels = annotations
else:
image_labels = gio.read(parcellation_file)
texture = numpy.round(image_labels.darrays[0].data).astype(int)
wm_surf = TriSurface(vertices, triangles, labels=texture.copy())
# Four colors theorem to generate the cmap
import networkx as nx
import json
# > define distinct colors
colors_rgb = [(230, 25, 75), (60, 180, 75), (255, 225, 25), (0, 130, 200),
(245, 130, 48), (145, 30, 180),
(70, 240, 240), (240, 50, 230), (210, 245, 60),
(250, 190, 190), (0, 128, 128), (230, 190, 255),
(170, 110, 40), (255, 250, 200), (128, 0, 0),
(170, 255, 195), (128, 128, 0), (255, 215, 180), (0, 0, 128),
(128, 128, 128), (255, 255, 255)]
# > create the graph nodes
graph = nx.Graph()
unique_labels = numpy.unique(texture)
graph.add_nodes_from(unique_labels, color=None)
# > get the cluster centroids & neighboor vertices
clusters_map = {}
for label in unique_labels:
indices = numpy.where(wm_surf.labels == label)[0]
cluster_triangles = wm_surf.triangles[list(
numpy.where(numpy.isin(wm_surf.triangles, indices))[0])]
cluster_indices = cluster_triangles[numpy.where(
numpy.isin(cluster_triangles, indices, invert=True))]
neighboors_indices = list(
set(cluster_indices.astype(int)) - set(indices.astype(int)))
clusters_map[label] = {
"vertices": indices.tolist(),
"neighboors": neighboors_indices
}
# > compute the graph edges
edges = []
nb_labels = len(unique_labels)
for ind1 in range(nb_labels):
for ind2 in range(ind1 + 1, nb_labels):
label = unique_labels[ind1]
other_label = unique_labels[ind2]
if numpy.isin(clusters_map[other_label]["vertices"],
clusters_map[label]["neighboors"]).any():
edges.append([label, other_label])
graph.add_edges_from(edges)
# > graph coloring
colors = nx.algorithms.coloring.greedy_coloring.greedy_color(graph)
ctab = []
for label, color_id in colors.items():
if label < 0:
continue
ctab.append(
list(colors_rgb[color_id % len(colors_rgb)]) + [255., label])
ctab.append([0., 0., 0., 255., unique_labels.max() + 1])
ctab = numpy.asarray(ctab)
# > create the actor
wm_surf.labels = wm_surf.labels.astype(float)
if pits_texture is not None:
wm_surf.labels[numpy.where(pits_texture == 1)] = (unique_labels.max() +
1)
wm_surf.labels[numpy.where(wm_surf.labels == -1)] = unique_labels.max() + 1
actor = pvtk.surface(wm_surf.vertices,
wm_surf.triangles,
wm_surf.labels,
ctab=ctab,
opacity=1,
set_lut=True)
actor.label = "white"
actor.RotateX(actor_ang[0])
actor.RotateY(actor_ang[1])
actor.RotateZ(actor_ang[2])
pvtk.add(ren, actor)
# Show the renderer
if interactive:
pvtk.add(ren, actor)
pvtk.show(ren, title=name)
# Create a snap
if snap:
if not os.path.isdir(outdir):
raise ValueError("'{0}' is not a valid directory.".format(outdir))
pvtk.record(ren, outdir, name, n_frames=1)
# Create an animation
if animate:
if not os.path.isdir(outdir):
raise ValueError("'{0}' is not a valid directory.".format(outdir))
pvtk.record(ren,
outdir,
name,
n_frames=36,
az_ang=10,
animate=True,
delay=25)
def convert_mesh(texture_file,
mesh_file,
t1_file,
outpattern=None,
mgz_file=None,
freesurfer_conformed=True,
freesurfer_native_t1_file=None):
""" Extract texture coordinates from white matter mesh in physical
morphological space and put them in NIFTI voxel space.
Parameters
----------
texture_file: str
the pits or parcellations '.gii' file. The parcellation can also be
given as an annation '.annot' file.
mesh_file: str
the path to white matter '.gii' mesh file.
t1_file: str
the t1 NIFTI file.
outpattern: str, default None
if set, save the mesh in native space concatenating this patern with
'mesh.native.nii.gz'.
mgz_file: str, default None
a FreeSurfer '.mgz' file.
freesurfer_conformed: bool, default True
if set apply the translation to go from the conformed to native space.
freesurfer_native_t1_file: str, default None
if set, consider the input mesh as a FreeSurfer mesh in the conformed
space, otherwise a morphologist mesh.
Returns
-------
mesh_vertices: ndarray (shape (N,3))
all mesh vertices in NIFTI voxel space.
texture_label_indices: list of ndarray (shape (N, 1))
the texture labels locations that can be applied on the mesh vertices.
texture_label_names: list of str
the name of the texture labels.
"""
# Load pits and mesh file
if texture_file.endswith(".gii"):
texture_gii = gio.read(texture_file)
texture = texture_gii.darrays[0].data
labels = None
elif texture_file.endswith(".annot"):
texture, _, labels = fio.read_annot(texture_file)
texture = texture.astype(int)
mesh_gii = gio.read(mesh_file)
mesh_vertices = mesh_gii.darrays[0].data
# Get mesh vertices and pits' mask array and check data adequacy
if mesh_vertices.shape[0] != texture.shape[0]:
raise ValueError("Texture file and white matter surface file "
"should have the same number of vertices.")
unique_labels = numpy.unique(texture).tolist()
if 0 in unique_labels:
unique_labels.remove(0)
texture_label_indices = []
texture_label_names = []
for cnt, label in enumerate(sorted(unique_labels)):
if labels is not None:
texture_label_names.append("{0}-{1}".format(label, labels[cnt]))
else:
texture_label_names.append("{0}".format(label))
texture_label_indices.append(numpy.where(texture == label))
# Load image
t1im = nibabel.load(t1_file)
affine = t1im.affine
shape = t1im.shape
# Realign the mesh in voxel Nifti space
# Morphologist mesh
if freesurfer_native_t1_file is None:
# > generate affine trf in morphologist coordinates
morphcoord = numpy.eye(4)
morphcoord[0, 0] = -1
morphcoord[1, 1] = 1
morphcoord[2, 2] = 1
morphcoord[0, 3] = affine[0, 3]
morphcoord[1, 3] = -affine[1, 3]
morphcoord[2, 3] = -affine[2, 3]
morphaffine = numpy.dot(morphcoord, affine)
# > deal with axis inversion
inv_morphaffine = numpy.linalg.inv(morphaffine)
inv_morphaffine[1, 1] = -inv_morphaffine[1, 1]
inv_morphaffine[2, 2] = -inv_morphaffine[2, 2]
inv_morphaffine[1, 3] = shape[1]
inv_morphaffine[2, 3] = shape[2]
mesh_vertices = apply_affine_on_mesh(mesh_vertices, inv_morphaffine)
# FreeSurfer mesh
else:
fs_t1_image = nibabel.load(freesurfer_native_t1_file)
# > FreeSurfer resample the T1 image to 1iso
freesurfer_to_original_trf = numpy.dot(numpy.linalg.inv(t1im.affine),
fs_t1_image.affine)
# > Deal with FreeSurfer inner conformed space
physical_to_index = numpy.linalg.inv(fs_t1_image.get_affine())
if freesurfer_conformed:
translation = tkregister_translation(mgz_file)
else:
translation = numpy.eye(4)
conformed_to_native_trf = numpy.dot(physical_to_index, translation)
conformed_to_original_trf = numpy.dot(freesurfer_to_original_trf,
conformed_to_native_trf)
mesh_vertices = apply_affine_on_mesh(mesh_vertices,
conformed_to_original_trf)
# Save the vertices as an image
if outpattern is not None:
overlay_file = outpattern + "mesh.native.nii.gz"
overlay = numpy.zeros(t1im.shape, dtype=numpy.uint)
indices = numpy.round(mesh_vertices).astype(int).T
indices[0, numpy.where(indices[0] >= t1im.shape[0])] = 0
indices[1, numpy.where(indices[1] >= t1im.shape[1])] = 0
indices[2, numpy.where(indices[2] >= t1im.shape[2])] = 0
overlay[indices.tolist()] = 1
overlay_image = nibabel.Nifti1Image(overlay, t1im.affine)
nibabel.save(overlay_image, overlay_file)
return mesh_vertices, texture_label_indices, texture_label_names
def read_thickness(self, subject_id):
"""
Extracts thickness information from annot and label files (left and right hemisphere)
it returns a DataFrame with the regions (columns) and its mean-std values (single row)
:param subject_id: 'XXX_S_XXXX' folder from dataset (ADNI Structure)
:return:
tk_stats: DataFrame with the single observation (
"""
# Set subject folder
subject_folder = os.path.join(self.dataset_folder, subject_id)
print('[ FS ] Loading subject %s' % subject_folder)
# Load labels
labels_id_lh, ctab_lh, labels_lh = nbfs.read_annot(
os.path.join(subject_folder, 'label', 'lh' + '.aparc.annot'))
labels_id_lh[labels_id_lh == -1] = 0 # -1 Correction
thickness_lh = nbfs.read_morph_data(
os.path.join(subject_folder, 'surf', 'lh' + '.thickness'))
labels_id_rh, ctab_rh, labels_rh = nbfs.read_annot(
os.path.join(subject_folder, 'label', 'rh' + '.aparc.annot'))
labels_id_rh[labels_id_rh == -1] = 0 # -1 Correction
thickness_rh = nbfs.read_morph_data(
os.path.join(subject_folder, 'surf', 'rh' + '.thickness'))
columns = map(lambda x: 'lh_' + x + '_mean', labels_lh) + map(lambda x: 'lh_' + x + '_std', labels_lh) + \
map(lambda x: 'rh_' + x + '_mean', labels_rh) + map(lambda x: 'rh_' + x + '_std', labels_rh)
tk_stats = pd.DataFrame(columns=columns)
# Left hemisphere
tk_mean_lh = []
tk_std_lh = []
tk_mean_rh = []
tk_std_rh = []
for i, label in enumerate(labels_lh):
if thickness_lh[labels_id_lh == i].any():
tk_mean_lh.append(
np.mean(np.nan_to_num(thickness_lh[labels_id_lh == i])))
tk_std_lh.append(
np.std(np.nan_to_num(thickness_lh[labels_id_lh == i])))
else:
tk_mean_lh.append(0)
tk_std_lh.append(0)
for i, label in enumerate(labels_lh):
if thickness_lh[labels_id_lh == i].any():
tk_mean_rh.append(
np.mean(np.nan_to_num(thickness_rh[labels_id_rh == i])))
tk_std_rh.append(
np.std(np.nan_to_num(thickness_rh[labels_id_rh == i])))
else:
tk_mean_rh.append(0)
tk_std_rh.append(0)
tk_stats.loc[0] = tk_mean_lh + tk_std_lh + tk_mean_rh + tk_std_rh
morph_data = {
'labels_id': [labels_id_lh, labels_id_rh],
'ctab': [ctab_lh, ctab_rh],
'labels': [labels_lh, labels_rh]
}
return tk_stats, morph_data
def vertices_to_parcels(data, *, lhannot, rhannot, drop=None):
"""
Reduces vertex-level `data` to parcels defined in annotation files
Takes average of vertices within each parcel, excluding np.nan values
(i.e., np.nanmean). Assigns np.nan to parcels for which all vertices are
np.nan.
Parameters
----------
data : (N,) numpy.ndarray
Vertex-level data to be reduced to parcels
{lh,rh}annot : str
Path to .annot file containing labels to parcels on the {left,right}
hemisphere
drop : list, optional
Specifies regions in {lh,rh}annot that should be removed from the
parcellated version of `data`. If not specified, 'unknown' and
'corpuscallosum' will be removed. Default: None
Reurns
------
reduced : numpy.ndarray
Parcellated `data`, without regions specified in `drop`
"""
if drop is None:
drop = ['unknown', 'corpuscallosum']
drop = _decode_list(drop)
start = end = 0
reduced = []
# check this so we're not unduly surprised by anything...
expected = sum([len(read_annot(a)[0]) for a in [lhannot, rhannot]])
if expected != len(data):
raise ValueError('Number of vertices in provided annotation files '
'differs from size of vertex-level data array.\n'
' EXPECTED: {} vertices\n'
' RECEIVED: {} vertices'.format(
expected, len(data)))
for annot in [lhannot, rhannot]:
# read files and update end index for `data`
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
indices = np.unique(labels)
end += len(labels)
# get average of vertex-level data within parcels
# set all NaN values to 0 before calling `_stats` because we are
# returning sums, so the 0 values won't impact the sums (if we left
# the NaNs then all parcels with even one NaN entry would be NaN)
currdata = np.squeeze(data[start:end])
isna = np.isnan(currdata)
counts, sums = _stats(np.nan_to_num(currdata), labels, indices)
# however, we do need to account for the NaN values in the counts
# so that our means are similar to what we'd get from e.g., np.nanmean
# here, our "sums" are the counts of NaN values in our parcels
_, nacounts = _stats(isna, labels, indices)
counts = (np.asanyarray(counts, dtype=float) -
np.asanyarray(nacounts, dtype=float))
with np.errstate(divide='ignore', invalid='ignore'):
currdata = sums / counts
# get indices of unkown and corpuscallosum and delete from parcels
inds = [names.index(f) for f in drop]
currdata = np.delete(currdata, inds)
# store parcellated data
reduced.append(currdata)
start = end
return np.hstack(reduced)
def find_parcel_centroids(*,
lhannot,
rhannot,
version='fsaverage',
surf='sphere',
drop=None):
"""
Returns vertex coords corresponding to centroids of parcels in annotations
Note that using any other `surf` besides the default of 'sphere' may result
in centroids that are not directly within the parcels themselves due to
sulcal folding patterns.
Parameters
----------
{lh,rh}annot : str
Path to .annot file containing labels of parcels on the {left,right}
hemisphere. These must be specified as keyword arguments to avoid
accidental order switching.
version : str, optional
Specifies which version of `fsaverage` provided annotation files
correspond to. Must be one of {'fsaverage', 'fsaverage3', 'fsaverage4',
'fsaverage5', 'fsaverage6'}. Default: 'fsaverage'
surf : str, optional
Specifies which surface projection of fsaverage to use for finding
parcel centroids. Default: 'sphere'
drop : list, optional
Specifies regions in {lh,rh}annot for which the parcel centroid should
not be calculated. If not specified, centroids for 'unknown' and
'corpuscallosum' are not calculated. Default: None
Returns
-------
centroids : (N, 3) numpy.ndarray
xyz coordinates of vertices closest to the centroid of each parcel
defined in `lhannot` and `rhannot`
hemiid : (N,) numpy.ndarray
Array denoting hemisphere designation of coordinates in `centroids`,
where `hemiid=0` denotes the right and `hemiid=1` the left hemisphere
"""
if drop is None:
drop = ['unknown', 'corpuscallosum']
drop = _decode_list(drop)
surfaces = fetch_fsaverage(version)[surf]
centroids, hemiid = [], []
for n, (annot, surf) in enumerate(zip([lhannot, rhannot], surfaces)):
vertices, faces = read_geometry(surf)
labels, ctab, names = read_annot(annot)
names = _decode_list(names)
for lab in np.unique(labels):
if names[lab] in drop:
continue
coords = np.atleast_2d(vertices[labels == lab].mean(axis=0))
roi = vertices[np.argmin(cdist(vertices, coords), axis=0)[0]]
centroids.append(roi)
hemiid.append(n)
return np.row_stack(centroids), np.asarray(hemiid)
