Dpy (fname[, mode, compression])
|
Methods
|
load_pickle (fname)
|
Load object from pickle file fname. |
orientation_from_string (string_ornt)
|
Returns an array representation of an ornt string |
orientation_to_string (ornt)
|
Returns a string representation of a 3d ornt |
ornt_mapping (ornt1, ornt2)
|
Calculates the mapping needing to get from orn1 to orn2 |
read_bvals_bvecs (fbvals, fbvecs)
|
Read b-values and b-vectors from disk. |
read_bvec_file (filename[, atol])
|
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead |
reorient_on_axis (input, current_ornt, new_ornt)
|
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead |
reorient_vectors (input, current_ornt, new_ornt)
|
Changes the orientation of a gradients or other vectors |
save_pickle (fname, dix)
|
Save dix to fname as pickle. |
Module: io.bvectxt
deprecate_with_version (message[, since, ...])
|
Return decorator function function for deprecation warning / error. |
orientation_from_string (string_ornt)
|
Returns an array representation of an ornt string |
orientation_to_string (ornt)
|
Returns a string representation of a 3d ornt |
ornt_mapping (ornt1, ornt2)
|
Calculates the mapping needing to get from orn1 to orn2 |
read_bvec_file (filename[, atol])
|
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead |
reorient_on_axis (input, current_ornt, new_ornt)
|
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead |
reorient_vectors (input, current_ornt, new_ornt)
|
Changes the orientation of a gradients or other vectors |
splitext (p)
|
Split the extension from a pathname. |
Module: io.dpy
A class for handling large tractography datasets.
It is built using the h5py which in turn implement
key features of the HDF5 (hierachical data format) API [1].
Dpy (fname[, mode, compression])
|
Methods
|
Streamlines
|
alias of nibabel.streamlines.array_sequence.ArraySequence |
Module: io.gradients
InTemporaryDirectory ([suffix, prefix, dir])
|
Create, return, and change directory to a temporary directory |
read_bvals_bvecs (fbvals, fbvecs)
|
Read b-values and b-vectors from disk. |
splitext (p)
|
Split the extension from a pathname. |
Module: io.image
load_nifti (fname[, return_img, ...])
|
Load data and other information from a nifti file. |
load_nifti_data (fname[, as_ndarray])
|
Load only the data array from a nifti file. |
save_nifti (fname, data, affine[, hdr])
|
Save a data array into a nifti file. |
save_qa_metric (fname, xopt, fopt)
|
Save Quality Assurance metrics. |
Module: io.peaks
PeaksAndMetrics
|
- Attributes
|
Sphere ([x, y, z, theta, phi, xyz, faces, edges])
|
Points on the unit sphere. |
load_peaks (fname[, verbose])
|
Load a PeaksAndMetrics HDF5 file (PAM5) |
peaks_to_niftis (pam, fname_shm, fname_dirs, ...)
|
Save SH, directions, indices and values of peaks to Nifti. |
reshape_peaks_for_visualization (peaks)
|
Reshape peaks for visualization. |
save_nifti (fname, data, affine[, hdr])
|
Save a data array into a nifti file. |
save_peaks (fname, pam[, affine, verbose])
|
Save all important attributes of object PeaksAndMetrics in a PAM5 file (HDF5). |
Module: io.pickles
Load and save pickles
Module: io.stateful_tractogram
Origin (value)
|
Enum to simplify future change to convention |
PerArrayDict ([n_rows])
|
Dictionary for which key access can do slicing on the values. |
PerArraySequenceDict ([n_rows])
|
Dictionary for which key access can do slicing on the values. |
Space (value)
|
Enum to simplify future change to convention |
StatefulTractogram (streamlines, reference, space)
|
Class for stateful representation of collections of streamlines Object designed to be identical no matter the file format (trk, tck, vtk, fib, dpy). |
Streamlines
|
alias of nibabel.streamlines.array_sequence.ArraySequence |
Tractogram ([streamlines, ...])
|
Container for streamlines and their data information. |
product
|
product(*iterables, repeat=1) --> product object |
apply_affine (aff, pts)
|
Apply affine matrix aff to points pts |
bisect (/, a, x[, lo, hi])
|
Return the index where to insert item x in list a, assuming a is sorted. |
deepcopy (x[, memo, _nil])
|
Deep copy operation on arbitrary Python objects. |
get_reference_info (reference)
|
Will compare the spatial attribute of 2 references |
is_header_compatible (reference_1, reference_2)
|
Will compare the spatial attribute of 2 references |
is_reference_info_valid (affine, dimensions, ...)
|
Validate basic data type and value of spatial attribute. |
set_sft_logger_level (log_level)
|
Change the logger of the StatefulTractogram to one on the following: DEBUG, INFO, WARNING, CRITICAL, ERROR |
Module: io.streamline
Dpy (fname[, mode, compression])
|
Methods
|
Origin (value)
|
Enum to simplify future change to convention |
Space (value)
|
Enum to simplify future change to convention |
StatefulTractogram (streamlines, reference, space)
|
Class for stateful representation of collections of streamlines Object designed to be identical no matter the file format (trk, tck, vtk, fib, dpy). |
Tractogram ([streamlines, ...])
|
Container for streamlines and their data information. |
create_tractogram_header (tractogram_type, ...)
|
Write a standard trk/tck header from spatial attribute |
deepcopy (x[, memo, _nil])
|
Deep copy operation on arbitrary Python objects. |
detect_format (fileobj)
|
Returns the StreamlinesFile object guessed from the file-like object. |
is_header_compatible (reference_1, reference_2)
|
Will compare the spatial attribute of 2 references |
load_dpy (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .dpy format |
load_fib (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .fib format |
load_generator (ttype)
|
Generate a loading function that performs a file extension check to restrict the user to a single file format. |
load_tck (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .tck format |
load_tractogram (filename, reference[, ...])
|
Load the stateful tractogram from any format (trk/tck/vtk/vtp/fib/dpy) |
load_trk (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .trk format |
load_vtk (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .vtk format |
load_vtk_streamlines (filename[, to_lps])
|
Load streamlines from vtk polydata. |
load_vtp (filename, reference[, to_space, ...])
|
Load the stateful tractogram of the .vtp format |
save_dpy (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .dpy format |
save_fib (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .fib format |
save_generator (ttype)
|
Generate a saving function that performs a file extension check to restrict the user to a single file format. |
save_tck (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .tck format |
save_tractogram (sft, filename[, ...])
|
Save the stateful tractogram in any format (trk/tck/vtk/vtp/fib/dpy) |
save_trk (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .trk format |
save_vtk (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .vtk format |
save_vtk_streamlines (streamlines, filename)
|
Save streamlines as vtk polydata to a supported format file. |
save_vtp (sft, filename[, bbox_valid_check])
|
Save the stateful tractogram of the .vtp format |
Module: io.utils
Utility functions for file formats
Nifti1Image (dataobj, affine[, header, ...])
|
Class for single file NIfTI1 format image |
create_nifti_header (affine, dimensions, ...)
|
Write a standard nifti header from spatial attribute |
create_tractogram_header (tractogram_type, ...)
|
Write a standard trk/tck header from spatial attribute |
decfa (img_orig[, scale])
|
Create a nifti-compliant directional-encoded color FA image. |
decfa_to_float (img_orig)
|
Convert a nifti-compliant directional-encoded color FA image into a nifti image with RGB encoded in floating point resolution. |
detect_format (fileobj)
|
Returns the StreamlinesFile object guessed from the file-like object. |
get_reference_info (reference)
|
Will compare the spatial attribute of 2 references |
is_header_compatible (reference_1, reference_2)
|
Will compare the spatial attribute of 2 references |
is_reference_info_valid (affine, dimensions, ...)
|
Validate basic data type and value of spatial attribute. |
make5d (input)
|
reshapes the input to have 5 dimensions, adds extra dimensions just before the last dimession |
nifti1_symmat (image_data, *args, **kwargs)
|
Returns a Nifti1Image with a symmetric matrix intent |
optional_package (name[, trip_msg])
|
Return package-like thing and module setup for package name |
read_img_arr_or_path (data[, affine])
|
Helper function that handles inputs that can be paths, nifti img or arrays |
save_buan_profiles_hdf5 (fname, dt)
|
Saves the given input dataframe to .h5 file |
Module: io.vtk
-
class dipy.io.Dpy(fname, mode='r', compression=0)
Bases: object
Methods
-
__init__(fname, mode='r', compression=0)
Advanced storage system for tractography based on HDF5
- Parameters
- fnamestr, full filename
- mode‘r’ read
‘w’ write
‘r+’ read and write only if file already exists
- compression0 no compression to 9 maximum compression
Examples
>>> import os
>>> from tempfile import mkstemp #temp file
>>> from dipy.io.dpy import Dpy
>>> def dpy_example():
... fd,fname = mkstemp()
... fname += '.dpy'#add correct extension
... dpw = Dpy(fname,'w')
... A=np.ones((5,3))
... B=2*A.copy()
... C=3*A.copy()
... dpw.write_track(A)
... dpw.write_track(B)
... dpw.write_track(C)
... dpw.close()
... dpr = Dpy(fname,'r')
... dpr.read_track()
... dpr.read_track()
... dpr.read_tracksi([0, 1, 2, 0, 0, 2])
... dpr.close()
... os.remove(fname) #delete file from disk
>>> dpy_example()
-
close()
-
read_track()
read one track each time
-
read_tracks()
read the entire tractography
-
read_tracksi(indices)
read tracks with specific indices
-
version()
-
write_track(track)
write on track each time
-
write_tracks(tracks)
write many tracks together
load_pickle
-
dipy.io.load_pickle(fname)
Load object from pickle file fname.
- Parameters
- fnamestr
filename to load dict or other python object
- Returns
- dixobject
dictionary or other object
Examples
dipy.io.pickles.save_pickle
orientation_from_string
-
dipy.io.orientation_from_string(string_ornt)
Returns an array representation of an ornt string
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
orientation_to_string
-
dipy.io.orientation_to_string(ornt)
Returns a string representation of a 3d ornt
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
ornt_mapping
-
dipy.io.ornt_mapping(ornt1, ornt2)
Calculates the mapping needing to get from orn1 to orn2
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
read_bvals_bvecs
-
dipy.io.read_bvals_bvecs(fbvals, fbvecs)
Read b-values and b-vectors from disk.
- Parameters
- fbvalsstr
Full path to file with b-values. None to not read bvals.
- fbvecsstr
Full path of file with b-vectors. None to not read bvecs.
- Returns
- bvalsarray, (N,) or None
- bvecsarray, (N, 3) or None
Notes
Files can be either ‘.bvals’/’.bvecs’ or ‘.txt’ or ‘.npy’ (containing
arrays stored with the appropriate values).
read_bvec_file
-
dipy.io.read_bvec_file(filename, atol=0.001)
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
Read gradient table information from a pair of files with extentions
.bvec and .bval. The bval file should have one row of values
representing the bvalues of each volume in the dwi data set. The bvec
file should have three rows, where the rows are the x, y, and z
components of the normalized gradient direction for each of the
volumes.
- Parameters
- filename
The path to the either the bvec or bval file
- atolfloat, optional
The tolorance used to check all the gradient directions are
normalized. Defult is .001
reorient_on_axis
-
dipy.io.reorient_on_axis(input, current_ornt, new_ornt, axis=0)
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
reorient_vectors
-
dipy.io.reorient_vectors(input, current_ornt, new_ornt, axis=0)
Changes the orientation of a gradients or other vectors
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
Moves vectors, storted along axis, from current_ornt to new_ornt. For
example the vector [x, y, z] in “RAS” will be [-x, -y, z] in “LPS”.
R: Right
A: Anterior
S: Superior
L: Left
P: Posterior
I: Inferior
Examples
>>> gtab = np.array([[1, 1, 1], [1, 2, 3]])
>>> reorient_vectors(gtab, 'ras', 'asr', axis=1)
array([[1, 1, 1],
[2, 3, 1]])
>>> reorient_vectors(gtab, 'ras', 'lps', axis=1)
array([[-1, -1, 1],
[-1, -2, 3]])
>>> bvec = gtab.T
>>> reorient_vectors(bvec, 'ras', 'lps', axis=0)
array([[-1, -1],
[-1, -2],
[ 1, 3]])
>>> reorient_vectors(bvec, 'ras', 'lsp')
array([[-1, -1],
[ 1, 3],
[-1, -2]])
save_pickle
-
dipy.io.save_pickle(fname, dix)
Save dix to fname as pickle.
- Parameters
- fnamestr
filename to save object e.g. a dictionary
- dixstr
dictionary or other object
Examples
>>> import os
>>> from tempfile import mkstemp
>>> fd, fname = mkstemp() # make temporary file (opened, attached to fh)
>>> d={0:{'d':1}}
>>> save_pickle(fname, d)
>>> d2=load_pickle(fname)
We remove the temporary file we created for neatness
>>> os.close(fd) # the file is still open, we need to close the fh
>>> os.remove(fname)
deprecate_with_version
-
dipy.io.bvectxt.deprecate_with_version(message, since='', until='', version_comparator=<function cmp_pkg_version>, warn_class=<class 'DeprecationWarning'>, error_class=<class 'dipy.utils.deprecator.ExpiredDeprecationError'>)
Return decorator function function for deprecation warning / error.
The decorated function / method will:
Raise the given warning_class warning when the function / method gets
called, up to (and including) version until (if specified);
Raise the given error_class error when the function / method gets
called, when the package version is greater than version until (if
specified).
- Parameters
- messagestr
Message explaining deprecation, giving possible alternatives.
- sincestr, optional
Released version at which object was first deprecated.
- untilstr, optional
Last released version at which this function will still raise a
deprecation warning. Versions higher than this will raise an
error.
- version_comparatorcallable
Callable accepting string as argument, and return 1 if string
represents a higher version than encoded in the version_comparator, 0
if the version is equal, and -1 if the version is lower. For example,
the version_comparator may compare the input version string to the
current package version string.
- warn_classclass, optional
Class of warning to generate for deprecation.
- error_classclass, optional
Class of error to generate when version_comparator returns 1 for a
given argument of until
.
- Returns
- deprecatorfunc
Function returning a decorator.
orientation_from_string
-
dipy.io.bvectxt.orientation_from_string(string_ornt)
Returns an array representation of an ornt string
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
orientation_to_string
-
dipy.io.bvectxt.orientation_to_string(ornt)
Returns a string representation of a 3d ornt
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
ornt_mapping
-
dipy.io.bvectxt.ornt_mapping(ornt1, ornt2)
Calculates the mapping needing to get from orn1 to orn2
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
read_bvec_file
-
dipy.io.bvectxt.read_bvec_file(filename, atol=0.001)
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
Read gradient table information from a pair of files with extentions
.bvec and .bval. The bval file should have one row of values
representing the bvalues of each volume in the dwi data set. The bvec
file should have three rows, where the rows are the x, y, and z
components of the normalized gradient direction for each of the
volumes.
- Parameters
- filename
The path to the either the bvec or bval file
- atolfloat, optional
The tolorance used to check all the gradient directions are
normalized. Defult is .001
reorient_on_axis
-
dipy.io.bvectxt.reorient_on_axis(input, current_ornt, new_ornt, axis=0)
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
reorient_vectors
-
dipy.io.bvectxt.reorient_vectors(input, current_ornt, new_ornt, axis=0)
Changes the orientation of a gradients or other vectors
dipy.io.bvectxt module is deprecated, Please use dipy.core.gradients module instead
Moves vectors, storted along axis, from current_ornt to new_ornt. For
example the vector [x, y, z] in “RAS” will be [-x, -y, z] in “LPS”.
R: Right
A: Anterior
S: Superior
L: Left
P: Posterior
I: Inferior
Examples
>>> gtab = np.array([[1, 1, 1], [1, 2, 3]])
>>> reorient_vectors(gtab, 'ras', 'asr', axis=1)
array([[1, 1, 1],
[2, 3, 1]])
>>> reorient_vectors(gtab, 'ras', 'lps', axis=1)
array([[-1, -1, 1],
[-1, -2, 3]])
>>> bvec = gtab.T
>>> reorient_vectors(bvec, 'ras', 'lps', axis=0)
array([[-1, -1],
[-1, -2],
[ 1, 3]])
>>> reorient_vectors(bvec, 'ras', 'lsp')
array([[-1, -1],
[ 1, 3],
[-1, -2]])
splitext
-
dipy.io.bvectxt.splitext(p)
Split the extension from a pathname.
Extension is everything from the last dot to the end, ignoring
leading dots. Returns “(root, ext)”; ext may be empty.
-
class dipy.io.dpy.Dpy(fname, mode='r', compression=0)
Bases: object
Methods
-
__init__(fname, mode='r', compression=0)
Advanced storage system for tractography based on HDF5
- Parameters
- fnamestr, full filename
- mode‘r’ read
‘w’ write
‘r+’ read and write only if file already exists
- compression0 no compression to 9 maximum compression
Examples
>>> import os
>>> from tempfile import mkstemp #temp file
>>> from dipy.io.dpy import Dpy
>>> def dpy_example():
... fd,fname = mkstemp()
... fname += '.dpy'#add correct extension
... dpw = Dpy(fname,'w')
... A=np.ones((5,3))
... B=2*A.copy()
... C=3*A.copy()
... dpw.write_track(A)
... dpw.write_track(B)
... dpw.write_track(C)
... dpw.close()
... dpr = Dpy(fname,'r')
... dpr.read_track()
... dpr.read_track()
... dpr.read_tracksi([0, 1, 2, 0, 0, 2])
... dpr.close()
... os.remove(fname) #delete file from disk
>>> dpy_example()
-
close()
-
read_track()
read one track each time
-
read_tracks()
read the entire tractography
-
read_tracksi(indices)
read tracks with specific indices
-
version()
-
write_track(track)
write on track each time
-
write_tracks(tracks)
write many tracks together
-
dipy.io.dpy.Streamlines
alias of nibabel.streamlines.array_sequence.ArraySequence
-
class dipy.io.gradients.InTemporaryDirectory(suffix='', prefix='tmp', dir=None)
Bases: nibabel.tmpdirs.TemporaryDirectory
Create, return, and change directory to a temporary directory
Examples
>>> import os
>>> my_cwd = os.getcwd()
>>> with InTemporaryDirectory() as tmpdir:
... _ = open('test.txt', 'wt').write('some text')
... assert os.path.isfile('test.txt')
... assert os.path.isfile(os.path.join(tmpdir, 'test.txt'))
>>> os.path.exists(tmpdir)
False
>>> os.getcwd() == my_cwd
True
Methods
-
__init__(suffix='', prefix='tmp', dir=None)
read_bvals_bvecs
-
dipy.io.gradients.read_bvals_bvecs(fbvals, fbvecs)
Read b-values and b-vectors from disk.
- Parameters
- fbvalsstr
Full path to file with b-values. None to not read bvals.
- fbvecsstr
Full path of file with b-vectors. None to not read bvecs.
- Returns
- bvalsarray, (N,) or None
- bvecsarray, (N, 3) or None
Notes
Files can be either ‘.bvals’/’.bvecs’ or ‘.txt’ or ‘.npy’ (containing
arrays stored with the appropriate values).
splitext
-
dipy.io.gradients.splitext(p)
Split the extension from a pathname.
Extension is everything from the last dot to the end, ignoring
leading dots. Returns “(root, ext)”; ext may be empty.
load_nifti
-
dipy.io.image.load_nifti(fname, return_img=False, return_voxsize=False, return_coords=False, as_ndarray=True)
Load data and other information from a nifti file.
- Parameters
- fnamestr
Full path to a nifti file.
- return_imgbool, optional
Whether to return the nibabel nifti img object. Default: False
- return_voxsize: bool, optional
Whether to return the nifti header zooms. Default: False
- return_coordsbool, optional
Whether to return the nifti header aff2axcodes. Default: False
- as_ndarray: bool, optional
convert nibabel ArrayProxy to a numpy.ndarray.
If you want to save memory and delay this casting, just turn this
option to False (default: True)
- Returns
- A tuple, with (at the most, if all keyword args are set to True):
- (data, img.affine, img, vox_size, nib.aff2axcodes(img.affine))
load_nifti_data
-
dipy.io.image.load_nifti_data(fname, as_ndarray=True)
Load only the data array from a nifti file.
- Parameters
- fnamestr
Full path to the file.
- as_ndarray: bool, optional
convert nibabel ArrayProxy to a numpy.ndarray.
If you want to save memory and delay this casting, just turn this
option to False (default: True)
- Returns
- data: np.ndarray or nib.ArrayProxy
save_nifti
-
dipy.io.image.save_nifti(fname, data, affine, hdr=None)
Save a data array into a nifti file.
- Parameters
- fnamestr
The full path to the file to be saved.
- datandarray
The array with the data to save.
- affine4x4 array
The affine transform associated with the file.
- hdrnifti header, optional
May contain additional information to store in the file header.
- Returns
- None
save_qa_metric
-
dipy.io.image.save_qa_metric(fname, xopt, fopt)
Save Quality Assurance metrics.
- Parameters
- fname: string
File name to save the metric values.
- xopt: numpy array
The metric containing the
optimal parameters for
image registration.
- fopt: int
The distance between the registered images.
-
class dipy.io.peaks.PeaksAndMetrics
Bases: dipy.reconst.eudx_direction_getter.EuDXDirectionGetter
- Attributes
- ang_thr
- qa_thr
- total_weight
Methods
initial_direction
|
The best starting directions for fiber tracking from point |
generate_streamline |
|
get_direction |
|
-
__init__(*args, **kwargs)
-
class dipy.io.peaks.Sphere(x=None, y=None, z=None, theta=None, phi=None, xyz=None, faces=None, edges=None)
Bases: object
Points on the unit sphere.
The sphere can be constructed using one of three conventions:
Sphere(x, y, z)
Sphere(xyz=xyz)
Sphere(theta=theta, phi=phi)
- Parameters
- x, y, z1-D array_like
Vertices as x-y-z coordinates.
- theta, phi1-D array_like
Vertices as spherical coordinates. Theta and phi are the inclination
and azimuth angles respectively.
- xyz(N, 3) ndarray
Vertices as x-y-z coordinates.
- faces(N, 3) ndarray
Indices into vertices that form triangular faces. If unspecified,
the faces are computed using a Delaunay triangulation.
- edges(N, 2) ndarray
Edges between vertices. If unspecified, the edges are
derived from the faces.
- Attributes
- x
- y
- z
Methods
find_closest (xyz)
|
Find the index of the vertex in the Sphere closest to the input vector |
subdivide ([n])
|
Subdivides each face of the sphere into four new faces. |
-
__init__(x=None, y=None, z=None, theta=None, phi=None, xyz=None, faces=None, edges=None)
-
edges()
-
faces()
-
find_closest(xyz)
Find the index of the vertex in the Sphere closest to the input vector
- Parameters
- xyzarray-like, 3 elements
A unit vector
- Returns
- idxint
The index into the Sphere.vertices array that gives the closest
vertex (in angle).
-
subdivide(n=1)
Subdivides each face of the sphere into four new faces.
New vertices are created at a, b, and c. Then each face [x, y, z] is
divided into faces [x, a, c], [y, a, b], [z, b, c], and [a, b, c].
y
/\
/ \
a/____\b
/\ /\
/ \ / \
/____\/____\
x c z
- Parameters
- nint, optional
The number of subdivisions to preform.
- Returns
- new_sphereSphere
The subdivided sphere.
-
vertices()
-
property x
-
property y
-
property z
load_peaks
-
dipy.io.peaks.load_peaks(fname, verbose=False)
Load a PeaksAndMetrics HDF5 file (PAM5)
- Parameters
- fnamestring
Filename of PAM5 file.
- verbosebool
Print summary information about the loaded file.
- Returns
- pamPeaksAndMetrics object
peaks_to_niftis
-
dipy.io.peaks.peaks_to_niftis(pam, fname_shm, fname_dirs, fname_values, fname_indices, fname_gfa, reshape_dirs=False)
Save SH, directions, indices and values of peaks to Nifti.
reshape_peaks_for_visualization
-
dipy.io.peaks.reshape_peaks_for_visualization(peaks)
Reshape peaks for visualization.
Reshape and convert to float32 a set of peaks for visualisation with mrtrix
or the fibernavigator.
- Parameters
- peaks: nd array (…, N, 3) or PeaksAndMetrics object
The peaks to be reshaped and converted to float32.
- Returns
- peaksnd array (…, 3*N)
save_nifti
-
dipy.io.peaks.save_nifti(fname, data, affine, hdr=None)
Save a data array into a nifti file.
- Parameters
- fnamestr
The full path to the file to be saved.
- datandarray
The array with the data to save.
- affine4x4 array
The affine transform associated with the file.
- hdrnifti header, optional
May contain additional information to store in the file header.
- Returns
- None
save_peaks
-
dipy.io.peaks.save_peaks(fname, pam, affine=None, verbose=False)
Save all important attributes of object PeaksAndMetrics in a PAM5 file
(HDF5).
- Parameters
- fnamestring
Filename of PAM5 file
- pamPeaksAndMetrics
Object holding peak_dirs, shm_coeffs and other attributes
- affinearray
The 4x4 matrix transforming the date from native to world coordinates.
PeaksAndMetrics should have that attribute but if not it can be
provided here. Default None.
- verbosebool
Print summary information about the saved file.
load_pickle
-
dipy.io.pickles.load_pickle(fname)
Load object from pickle file fname.
- Parameters
- fnamestr
filename to load dict or other python object
- Returns
- dixobject
dictionary or other object
Examples
dipy.io.pickles.save_pickle
save_pickle
-
dipy.io.pickles.save_pickle(fname, dix)
Save dix to fname as pickle.
- Parameters
- fnamestr
filename to save object e.g. a dictionary
- dixstr
dictionary or other object
Examples
>>> import os
>>> from tempfile import mkstemp
>>> fd, fname = mkstemp() # make temporary file (opened, attached to fh)
>>> d={0:{'d':1}}
>>> save_pickle(fname, d)
>>> d2=load_pickle(fname)
We remove the temporary file we created for neatness
>>> os.close(fd) # the file is still open, we need to close the fh
>>> os.remove(fname)
-
class dipy.io.stateful_tractogram.Origin(value)
Bases: enum.Enum
Enum to simplify future change to convention
-
__init__(*args, **kwargs)
-
NIFTI = 'center'
-
TRACKVIS = 'corner'
-
class dipy.io.stateful_tractogram.PerArrayDict(n_rows=0, *args, **kwargs)
Bases: nibabel.streamlines.tractogram.SliceableDataDict
Dictionary for which key access can do slicing on the values.
This container behaves like a standard dictionary but extends key access to
allow keys for key access to be indices slicing into the contained ndarray
values. The elements must also be ndarrays.
In addition, it makes sure the amount of data contained in those ndarrays
matches the number of streamlines given at the instantiation of this
instance.
- Parameters
- n_rowsNone or int, optional
Number of rows per value in each key, value pair or None for not
specified.
- *args
- **kwargs
Positional and keyword arguments, passed straight through the dict
constructor.
Methods
clear ()
|
|
extend (other)
|
Appends the elements of another PerArrayDict . |
get (k[,d])
|
|
items ()
|
|
keys ()
|
|
pop (k[,d])
|
If key is not found, d is returned if given, otherwise KeyError is raised. |
popitem ()
|
as a 2-tuple; but raise KeyError if D is empty. |
setdefault (k[,d])
|
|
update ([E, ]**F)
|
If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v |
values ()
|
|
-
__init__(n_rows=0, *args, **kwargs)
-
extend(other)
Appends the elements of another PerArrayDict
.
That is, for each entry in this dictionary, we append the elements
coming from the other dictionary at the corresponding entry.
- Parameters
- other
PerArrayDict
object Its data will be appended to the data of this dictionary.
- Returns
- None
Notes
The keys in both dictionaries must be the same.
-
class dipy.io.stateful_tractogram.PerArraySequenceDict(n_rows=0, *args, **kwargs)
Bases: nibabel.streamlines.tractogram.PerArrayDict
Dictionary for which key access can do slicing on the values.
This container behaves like a standard dictionary but extends key access to
allow keys for key access to be indices slicing into the contained ndarray
values. The elements must also be ArraySequence
.
In addition, it makes sure the amount of data contained in those array
sequences matches the number of elements given at the instantiation
of the instance.
Methods
clear ()
|
|
extend (other)
|
Appends the elements of another PerArrayDict . |
get (k[,d])
|
|
items ()
|
|
keys ()
|
|
pop (k[,d])
|
If key is not found, d is returned if given, otherwise KeyError is raised. |
popitem ()
|
as a 2-tuple; but raise KeyError if D is empty. |
setdefault (k[,d])
|
|
update ([E, ]**F)
|
If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v |
values ()
|
|
-
__init__(n_rows=0, *args, **kwargs)
-
class dipy.io.stateful_tractogram.Space(value)
Bases: enum.Enum
Enum to simplify future change to convention
-
__init__(*args, **kwargs)
-
RASMM = 'rasmm'
-
VOX = 'vox'
-
VOXMM = 'voxmm'
-
class dipy.io.stateful_tractogram.StatefulTractogram(streamlines, reference, space, origin=Origin.NIFTI, data_per_point=None, data_per_streamline=None)
Bases: object
Class for stateful representation of collections of streamlines
Object designed to be identical no matter the file format
(trk, tck, vtk, fib, dpy). Facilitate transformation between space and
data manipulation for each streamline / point.
- Attributes
affine
Getter for the reference affine
data_per_point
Getter for data_per_point
data_per_streamline
Getter for data_per_streamline
dimensions
Getter for the reference dimensions
origin
Getter for origin standard
space
Getter for the current space
space_attributes
Getter for spatial attribute
streamlines
Partially safe getter for streamlines
voxel_order
Getter for the reference voxel order
voxel_sizes
Getter for the reference voxel sizes
Methods
are_compatible (sft_1, sft_2)
|
Compatibility verification of two StatefulTractogram to ensure space, origin, data_per_point and data_per_streamline consistency |
compute_bounding_box ()
|
Compute the bounding box of the streamlines in their current state |
from_sft (streamlines, sft[, data_per_point, ...])
|
Create an instance of StatefulTractogram from another instance of StatefulTractogram. |
get_data_per_point_keys ()
|
Return a list of the data_per_point attribute names |
get_data_per_streamline_keys ()
|
Return a list of the data_per_streamline attribute names |
get_streamlines_copy ()
|
Safe getter for streamlines (for slicing) |
is_bbox_in_vox_valid ()
|
Verify that the bounding box is valid in voxel space. |
remove_invalid_streamlines ([epsilon])
|
Remove streamlines with invalid coordinates from the object. |
to_center ()
|
Safe function to shift streamlines so the center of voxel is the origin |
to_corner ()
|
Safe function to shift streamlines so the corner of voxel is the origin |
to_origin (target_origin)
|
Safe function to change streamlines to a particular origin standard False means NIFTI (center) and True means TrackVis (corner) |
to_rasmm ()
|
Safe function to transform streamlines and update state |
to_space (target_space)
|
Safe function to transform streamlines to a particular space using an enum and update state |
to_vox ()
|
Safe function to transform streamlines and update state |
to_voxmm ()
|
Safe function to transform streamlines and update state |
-
__init__(streamlines, reference, space, origin=Origin.NIFTI, data_per_point=None, data_per_streamline=None)
Create a strict, state-aware, robust tractogram
- Parameters
- streamlineslist or ArraySequence
Streamlines of the tractogram
- referenceNifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header, trk.header (dict) or another Stateful Tractogram
Reference that provides the spatial attributes.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- spaceEnum (dipy.io.stateful_tractogram.Space)
Current space in which the streamlines are (vox, voxmm or rasmm)
After tracking the space is VOX, after loading with nibabel
the space is RASMM
- originEnum (dipy.io.stateful_tractogram.Origin), optional
Current origin in which the streamlines are (center or corner)
After loading with nibabel the origin is CENTER
- data_per_pointdict, optional
Dictionary in which each key has X items, each items has Y_i items
X being the number of streamlines
Y_i being the number of points on streamlines #i
- data_per_streamlinedict, optional
Dictionary in which each key has X items
X being the number of streamlines
Notes
Very important to respect the convention, verify that streamlines
match the reference and are effectively in the right space.
Any change to the number of streamlines, data_per_point or
data_per_streamline requires particular verification.
In a case of manipulation not allowed by this object, use Nibabel
directly and be careful.
-
property affine
Getter for the reference affine
-
static are_compatible(sft_1, sft_2)
Compatibility verification of two StatefulTractogram to ensure space,
origin, data_per_point and data_per_streamline consistency
-
compute_bounding_box()
Compute the bounding box of the streamlines in their current state
- Returns
- outputndarray
8 corners of the XYZ aligned box, all zeros if no streamlines
-
property data_per_point
Getter for data_per_point
-
property data_per_streamline
Getter for data_per_streamline
-
property dimensions
Getter for the reference dimensions
-
static from_sft(streamlines, sft, data_per_point=None, data_per_streamline=None)
Create an instance of StatefulTractogram from another instance
of StatefulTractogram.
- Parameters
- streamlineslist or ArraySequence
Streamlines of the tractogram
- sftStatefulTractgram,
The other StatefulTractgram to copy the space_attribute AND
state from.
- data_per_pointdict, optional
Dictionary in which each key has X items, each items has Y_i items
X being the number of streamlines
Y_i being the number of points on streamlines #i
- data_per_streamlinedict, optional
Dictionary in which each key has X items
X being the number of streamlines
- —–
-
get_data_per_point_keys()
Return a list of the data_per_point attribute names
-
get_data_per_streamline_keys()
Return a list of the data_per_streamline attribute names
-
get_streamlines_copy()
Safe getter for streamlines (for slicing)
-
is_bbox_in_vox_valid()
Verify that the bounding box is valid in voxel space.
Negative coordinates or coordinates above the volume dimensions
are considered invalid in voxel space.
- Returns
- outputbool
Are the streamlines within the volume of the associated reference
-
property origin
Getter for origin standard
-
remove_invalid_streamlines(epsilon=0.001)
Remove streamlines with invalid coordinates from the object.
Will also remove the data_per_point and data_per_streamline.
Invalid coordinates are any X,Y,Z values above the reference
dimensions or below zero
- Parameters
- epsilonfloat (optional)
Epsilon value for the bounding box verification.
Default is 1e-6.
- Returns
- outputtuple
Tuple of two list, indices_to_remove, indices_to_keep
-
property space
Getter for the current space
-
property space_attributes
Getter for spatial attribute
-
property streamlines
Partially safe getter for streamlines
-
to_center()
Safe function to shift streamlines so the center of voxel is
the origin
-
to_corner()
Safe function to shift streamlines so the corner of voxel is
the origin
-
to_origin(target_origin)
Safe function to change streamlines to a particular origin standard
False means NIFTI (center) and True means TrackVis (corner)
-
to_rasmm()
Safe function to transform streamlines and update state
-
to_space(target_space)
Safe function to transform streamlines to a particular space using
an enum and update state
-
to_vox()
Safe function to transform streamlines and update state
-
to_voxmm()
Safe function to transform streamlines and update state
-
property voxel_order
Getter for the reference voxel order
-
property voxel_sizes
Getter for the reference voxel sizes
-
dipy.io.stateful_tractogram.Streamlines
alias of nibabel.streamlines.array_sequence.ArraySequence
-
class dipy.io.stateful_tractogram.Tractogram(streamlines=None, data_per_streamline=None, data_per_point=None, affine_to_rasmm=None)
Bases: object
Container for streamlines and their data information.
Streamlines of a tractogram can be in any coordinate system of your
choice as long as you provide the correct affine_to_rasmm matrix, at
construction time. When applied to streamlines coordinates, that
transformation matrix should bring the streamlines back to world space
(RAS+ and mm space) .
Moreover, when streamlines are mapped back to voxel space , a
streamline point located at an integer coordinate (i,j,k) is considered
to be at the center of the corresponding voxel. This is in contrast with
other conventions where it might have referred to a corner.
References
- Attributes
- streamlines
ArraySequence
object Sequence of \(T\) streamlines. Each streamline is an ndarray of
shape (\(N_t\), 3) where \(N_t\) is the number of points of
streamline \(t\).
- data_per_streamline
PerArrayDict
object Dictionary where the items are (str, 2D array). Each key represents a
piece of information \(i\) to be kept alongside every streamline, and its
associated value is a 2D array of shape (\(T\), \(P_i\)) where \(T\) is the
number of streamlines and \(P_i\) is the number of values to store for
that particular piece of information \(i\).
- data_per_point
PerArraySequenceDict
object Dictionary where the items are (str, ArraySequence
). Each key
represents a piece of information \(i\) to be kept alongside every point
of every streamline, and its associated value is an iterable of
ndarrays of shape (\(N_t\), \(M_i\)) where \(N_t\) is the number of points
for a particular streamline \(t\) and \(M_i\) is the number values to store
for that particular piece of information \(i\).
Methods
apply_affine (affine[, lazy])
|
Applies an affine transformation on the points of each streamline. |
copy ()
|
Returns a copy of this Tractogram object. |
extend (other)
|
Appends the data of another Tractogram . |
to_world ([lazy])
|
Brings the streamlines to world space (i.e. |
-
__init__(streamlines=None, data_per_streamline=None, data_per_point=None, affine_to_rasmm=None)
- Parameters
- streamlinesiterable of ndarrays or
ArraySequence
, optional Sequence of \(T\) streamlines. Each streamline is an ndarray of
shape (\(N_t\), 3) where \(N_t\) is the number of points of
streamline \(t\).
- data_per_streamlinedict of iterable of ndarrays, optional
Dictionary where the items are (str, iterable).
Each key represents an information \(i\) to be kept alongside every
streamline, and its associated value is an iterable of ndarrays of
shape (\(P_i\),) where \(P_i\) is the number of scalar values to store
for that particular information \(i\).
- data_per_pointdict of iterable of ndarrays, optional
Dictionary where the items are (str, iterable).
Each key represents an information \(i\) to be kept alongside every
point of every streamline, and its associated value is an iterable
of ndarrays of shape (\(N_t\), \(M_i\)) where \(N_t\) is the number of
points for a particular streamline \(t\) and \(M_i\) is the number
scalar values to store for that particular information \(i\).
- affine_to_rasmmndarray of shape (4, 4) or None, optional
Transformation matrix that brings the streamlines contained in
this tractogram to RAS+ and mm space where coordinate (0,0,0)
refers to the center of the voxel. By default, the streamlines
are in an unknown space, i.e. affine_to_rasmm is None.
-
property affine_to_rasmm
Affine bringing streamlines in this tractogram to RAS+mm.
-
apply_affine(affine, lazy=False)
Applies an affine transformation on the points of each streamline.
If lazy is not specified, this is performed in-place.
- Parameters
- affinendarray of shape (4, 4)
Transformation that will be applied to every streamline.
- lazy{False, True}, optional
If True, streamlines are not transformed in-place and a
LazyTractogram
object is returned. Otherwise, streamlines
are modified in-place.
- Returns
- tractogram
Tractogram
or LazyTractogram
object Tractogram where the streamlines have been transformed according
to the given affine transformation. If the lazy option is true,
it returns a LazyTractogram
object, otherwise it returns a
reference to this Tractogram
object with updated
streamlines.
-
copy()
Returns a copy of this Tractogram
object.
-
property data_per_point
-
property data_per_streamline
-
extend(other)
Appends the data of another Tractogram
.
Data that will be appended includes the streamlines and the content
of both dictionaries data_per_streamline and data_per_point.
- Parameters
- other
Tractogram
object Its data will be appended to the data of this tractogram.
- Returns
- None
Notes
The entries in both dictionaries self.data_per_streamline and
self.data_per_point must match respectively those contained in
the other tractogram.
-
property streamlines
-
to_world(lazy=False)
Brings the streamlines to world space (i.e. RAS+ and mm).
If lazy is not specified, this is performed in-place.
- Parameters
- lazy{False, True}, optional
If True, streamlines are not transformed in-place and a
LazyTractogram
object is returned. Otherwise, streamlines
are modified in-place.
- Returns
- tractogram
Tractogram
or LazyTractogram
object Tractogram where the streamlines have been sent to world space.
If the lazy option is true, it returns a LazyTractogram
object, otherwise it returns a reference to this
Tractogram
object with updated streamlines.
-
class dipy.io.stateful_tractogram.product
Bases: object
product(*iterables, repeat=1) –> product object
Cartesian product of input iterables. Equivalent to nested for-loops.
For example, product(A, B) returns the same as: ((x,y) for x in A for y in B).
The leftmost iterators are in the outermost for-loop, so the output tuples
cycle in a manner similar to an odometer (with the rightmost element changing
on every iteration).
To compute the product of an iterable with itself, specify the number
of repetitions with the optional repeat keyword argument. For example,
product(A, repeat=4) means the same as product(A, A, A, A).
product(‘ab’, range(3)) –> (‘a’,0) (‘a’,1) (‘a’,2) (‘b’,0) (‘b’,1) (‘b’,2)
product((0,1), (0,1), (0,1)) –> (0,0,0) (0,0,1) (0,1,0) (0,1,1) (1,0,0) …
-
__init__(*args, **kwargs)
apply_affine
-
dipy.io.stateful_tractogram.apply_affine(aff, pts)
Apply affine matrix aff to points pts
Returns result of application of aff to the right of pts. The
coordinate dimension of pts should be the last.
For the 3D case, aff will be shape (4,4) and pts will have final axis
length 3 - maybe it will just be N by 3. The return value is the
transformed points, in this case:
res = np.dot(aff[:3,:3], pts.T) + aff[:3,3:4]
transformed_pts = res.T
This routine is more general than 3D, in that aff can have any shape
(N,N), and pts can have any shape, as long as the last dimension is for
the coordinates, and is therefore length N-1.
- Parameters
- aff(N, N) array-like
Homogenous affine, for 3D points, will be 4 by 4. Contrary to first
appearance, the affine will be applied on the left of pts.
- pts(…, N-1) array-like
Points, where the last dimension contains the coordinates of each
point. For 3D, the last dimension will be length 3.
- Returns
- transformed_pts(…, N-1) array
transformed points
Examples
>>> aff = np.array([[0,2,0,10],[3,0,0,11],[0,0,4,12],[0,0,0,1]])
>>> pts = np.array([[1,2,3],[2,3,4],[4,5,6],[6,7,8]])
>>> apply_affine(aff, pts)
array([[14, 14, 24],
[16, 17, 28],
[20, 23, 36],
[24, 29, 44]]...)
Just to show that in the simple 3D case, it is equivalent to:
>>> (np.dot(aff[:3,:3], pts.T) + aff[:3,3:4]).T
array([[14, 14, 24],
[16, 17, 28],
[20, 23, 36],
[24, 29, 44]]...)
But pts can be a more complicated shape:
>>> pts = pts.reshape((2,2,3))
>>> apply_affine(aff, pts)
array([[[14, 14, 24],
[16, 17, 28]],
[[20, 23, 36],
[24, 29, 44]]]...)
bisect
-
dipy.io.stateful_tractogram.bisect(/, a, x, lo=0, hi=None)
Return the index where to insert item x in list a, assuming a is sorted.
The return value i is such that all e in a[:i] have e <= x, and all e in
a[i:] have e > x. So if x already appears in the list, i points just
beyond the rightmost x already there
Optional args lo (default 0) and hi (default len(a)) bound the
slice of a to be searched.
deepcopy
-
dipy.io.stateful_tractogram.deepcopy(x, memo=None, _nil=[])
Deep copy operation on arbitrary Python objects.
See the module’s __doc__ string for more info.
get_reference_info
-
dipy.io.stateful_tractogram.get_reference_info(reference)
Will compare the spatial attribute of 2 references
- Parameters
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict)
Reference that provides the spatial attribute.
- Returns
- outputtuple
affine ndarray (4,4), np.float32, tranformation of VOX to RASMM
dimensions ndarray (3,), int16, volume shape for each axis
voxel_sizes ndarray (3,), float32, size of voxel for each axis
voxel_order, string, Typically ‘RAS’ or ‘LPS’
is_reference_info_valid
-
dipy.io.stateful_tractogram.is_reference_info_valid(affine, dimensions, voxel_sizes, voxel_order)
Validate basic data type and value of spatial attribute.
Does not ensure that voxel_sizes and voxel_order are self-coherent with
the affine.
Only verify the following:
affine is of the right type (float) and dimension (4,4)
affine contain values in the rotation part
dimensions is of right type (int) and length (3)
voxel_sizes is of right type (float) and length (3)
voxel_order is of right type (str) and length (3)
The listed parameters are what is expected, provide something else and this
function should fail (cover common mistakes).
- Parameters
- affine: ndarray (4,4)
Tranformation of VOX to RASMM
- dimensions: ndarray (3,), int16
Volume shape for each axis
- voxel_sizes: ndarray (3,), float32
Size of voxel for each axis
- voxel_order: string
Typically ‘RAS’ or ‘LPS’
- Returns
- outputbool
Does the input represent a valid ‘state’ of spatial attribute
set_sft_logger_level
-
dipy.io.stateful_tractogram.set_sft_logger_level(log_level)
Change the logger of the StatefulTractogram
to one on the following: DEBUG, INFO, WARNING, CRITICAL, ERROR
- Parameters
- log_levelstr
Log level for the StatefulTractogram only
-
class dipy.io.streamline.Dpy(fname, mode='r', compression=0)
Bases: object
Methods
-
__init__(fname, mode='r', compression=0)
Advanced storage system for tractography based on HDF5
- Parameters
- fnamestr, full filename
- mode‘r’ read
‘w’ write
‘r+’ read and write only if file already exists
- compression0 no compression to 9 maximum compression
Examples
>>> import os
>>> from tempfile import mkstemp #temp file
>>> from dipy.io.dpy import Dpy
>>> def dpy_example():
... fd,fname = mkstemp()
... fname += '.dpy'#add correct extension
... dpw = Dpy(fname,'w')
... A=np.ones((5,3))
... B=2*A.copy()
... C=3*A.copy()
... dpw.write_track(A)
... dpw.write_track(B)
... dpw.write_track(C)
... dpw.close()
... dpr = Dpy(fname,'r')
... dpr.read_track()
... dpr.read_track()
... dpr.read_tracksi([0, 1, 2, 0, 0, 2])
... dpr.close()
... os.remove(fname) #delete file from disk
>>> dpy_example()
-
close()
-
read_track()
read one track each time
-
read_tracks()
read the entire tractography
-
read_tracksi(indices)
read tracks with specific indices
-
version()
-
write_track(track)
write on track each time
-
write_tracks(tracks)
write many tracks together
-
class dipy.io.streamline.Origin(value)
Bases: enum.Enum
Enum to simplify future change to convention
-
__init__(*args, **kwargs)
-
NIFTI = 'center'
-
TRACKVIS = 'corner'
-
class dipy.io.streamline.Space(value)
Bases: enum.Enum
Enum to simplify future change to convention
-
__init__(*args, **kwargs)
-
RASMM = 'rasmm'
-
VOX = 'vox'
-
VOXMM = 'voxmm'
-
class dipy.io.streamline.StatefulTractogram(streamlines, reference, space, origin=Origin.NIFTI, data_per_point=None, data_per_streamline=None)
Bases: object
Class for stateful representation of collections of streamlines
Object designed to be identical no matter the file format
(trk, tck, vtk, fib, dpy). Facilitate transformation between space and
data manipulation for each streamline / point.
- Attributes
affine
Getter for the reference affine
data_per_point
Getter for data_per_point
data_per_streamline
Getter for data_per_streamline
dimensions
Getter for the reference dimensions
origin
Getter for origin standard
space
Getter for the current space
space_attributes
Getter for spatial attribute
streamlines
Partially safe getter for streamlines
voxel_order
Getter for the reference voxel order
voxel_sizes
Getter for the reference voxel sizes
Methods
are_compatible (sft_1, sft_2)
|
Compatibility verification of two StatefulTractogram to ensure space, origin, data_per_point and data_per_streamline consistency |
compute_bounding_box ()
|
Compute the bounding box of the streamlines in their current state |
from_sft (streamlines, sft[, data_per_point, ...])
|
Create an instance of StatefulTractogram from another instance of StatefulTractogram. |
get_data_per_point_keys ()
|
Return a list of the data_per_point attribute names |
get_data_per_streamline_keys ()
|
Return a list of the data_per_streamline attribute names |
get_streamlines_copy ()
|
Safe getter for streamlines (for slicing) |
is_bbox_in_vox_valid ()
|
Verify that the bounding box is valid in voxel space. |
remove_invalid_streamlines ([epsilon])
|
Remove streamlines with invalid coordinates from the object. |
to_center ()
|
Safe function to shift streamlines so the center of voxel is the origin |
to_corner ()
|
Safe function to shift streamlines so the corner of voxel is the origin |
to_origin (target_origin)
|
Safe function to change streamlines to a particular origin standard False means NIFTI (center) and True means TrackVis (corner) |
to_rasmm ()
|
Safe function to transform streamlines and update state |
to_space (target_space)
|
Safe function to transform streamlines to a particular space using an enum and update state |
to_vox ()
|
Safe function to transform streamlines and update state |
to_voxmm ()
|
Safe function to transform streamlines and update state |
-
__init__(streamlines, reference, space, origin=Origin.NIFTI, data_per_point=None, data_per_streamline=None)
Create a strict, state-aware, robust tractogram
- Parameters
- streamlineslist or ArraySequence
Streamlines of the tractogram
- referenceNifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header, trk.header (dict) or another Stateful Tractogram
Reference that provides the spatial attributes.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- spaceEnum (dipy.io.stateful_tractogram.Space)
Current space in which the streamlines are (vox, voxmm or rasmm)
After tracking the space is VOX, after loading with nibabel
the space is RASMM
- originEnum (dipy.io.stateful_tractogram.Origin), optional
Current origin in which the streamlines are (center or corner)
After loading with nibabel the origin is CENTER
- data_per_pointdict, optional
Dictionary in which each key has X items, each items has Y_i items
X being the number of streamlines
Y_i being the number of points on streamlines #i
- data_per_streamlinedict, optional
Dictionary in which each key has X items
X being the number of streamlines
Notes
Very important to respect the convention, verify that streamlines
match the reference and are effectively in the right space.
Any change to the number of streamlines, data_per_point or
data_per_streamline requires particular verification.
In a case of manipulation not allowed by this object, use Nibabel
directly and be careful.
-
property affine
Getter for the reference affine
-
static are_compatible(sft_1, sft_2)
Compatibility verification of two StatefulTractogram to ensure space,
origin, data_per_point and data_per_streamline consistency
-
compute_bounding_box()
Compute the bounding box of the streamlines in their current state
- Returns
- outputndarray
8 corners of the XYZ aligned box, all zeros if no streamlines
-
property data_per_point
Getter for data_per_point
-
property data_per_streamline
Getter for data_per_streamline
-
property dimensions
Getter for the reference dimensions
-
static from_sft(streamlines, sft, data_per_point=None, data_per_streamline=None)
Create an instance of StatefulTractogram from another instance
of StatefulTractogram.
- Parameters
- streamlineslist or ArraySequence
Streamlines of the tractogram
- sftStatefulTractgram,
The other StatefulTractgram to copy the space_attribute AND
state from.
- data_per_pointdict, optional
Dictionary in which each key has X items, each items has Y_i items
X being the number of streamlines
Y_i being the number of points on streamlines #i
- data_per_streamlinedict, optional
Dictionary in which each key has X items
X being the number of streamlines
- —–
-
get_data_per_point_keys()
Return a list of the data_per_point attribute names
-
get_data_per_streamline_keys()
Return a list of the data_per_streamline attribute names
-
get_streamlines_copy()
Safe getter for streamlines (for slicing)
-
is_bbox_in_vox_valid()
Verify that the bounding box is valid in voxel space.
Negative coordinates or coordinates above the volume dimensions
are considered invalid in voxel space.
- Returns
- outputbool
Are the streamlines within the volume of the associated reference
-
property origin
Getter for origin standard
-
remove_invalid_streamlines(epsilon=0.001)
Remove streamlines with invalid coordinates from the object.
Will also remove the data_per_point and data_per_streamline.
Invalid coordinates are any X,Y,Z values above the reference
dimensions or below zero
- Parameters
- epsilonfloat (optional)
Epsilon value for the bounding box verification.
Default is 1e-6.
- Returns
- outputtuple
Tuple of two list, indices_to_remove, indices_to_keep
-
property space
Getter for the current space
-
property space_attributes
Getter for spatial attribute
-
property streamlines
Partially safe getter for streamlines
-
to_center()
Safe function to shift streamlines so the center of voxel is
the origin
-
to_corner()
Safe function to shift streamlines so the corner of voxel is
the origin
-
to_origin(target_origin)
Safe function to change streamlines to a particular origin standard
False means NIFTI (center) and True means TrackVis (corner)
-
to_rasmm()
Safe function to transform streamlines and update state
-
to_space(target_space)
Safe function to transform streamlines to a particular space using
an enum and update state
-
to_vox()
Safe function to transform streamlines and update state
-
to_voxmm()
Safe function to transform streamlines and update state
-
property voxel_order
Getter for the reference voxel order
-
property voxel_sizes
Getter for the reference voxel sizes
-
class dipy.io.streamline.Tractogram(streamlines=None, data_per_streamline=None, data_per_point=None, affine_to_rasmm=None)
Bases: object
Container for streamlines and their data information.
Streamlines of a tractogram can be in any coordinate system of your
choice as long as you provide the correct affine_to_rasmm matrix, at
construction time. When applied to streamlines coordinates, that
transformation matrix should bring the streamlines back to world space
(RAS+ and mm space) .
Moreover, when streamlines are mapped back to voxel space , a
streamline point located at an integer coordinate (i,j,k) is considered
to be at the center of the corresponding voxel. This is in contrast with
other conventions where it might have referred to a corner.
References
- Attributes
- streamlines
ArraySequence
object Sequence of \(T\) streamlines. Each streamline is an ndarray of
shape (\(N_t\), 3) where \(N_t\) is the number of points of
streamline \(t\).
- data_per_streamline
PerArrayDict
object Dictionary where the items are (str, 2D array). Each key represents a
piece of information \(i\) to be kept alongside every streamline, and its
associated value is a 2D array of shape (\(T\), \(P_i\)) where \(T\) is the
number of streamlines and \(P_i\) is the number of values to store for
that particular piece of information \(i\).
- data_per_point
PerArraySequenceDict
object Dictionary where the items are (str, ArraySequence
). Each key
represents a piece of information \(i\) to be kept alongside every point
of every streamline, and its associated value is an iterable of
ndarrays of shape (\(N_t\), \(M_i\)) where \(N_t\) is the number of points
for a particular streamline \(t\) and \(M_i\) is the number values to store
for that particular piece of information \(i\).
Methods
apply_affine (affine[, lazy])
|
Applies an affine transformation on the points of each streamline. |
copy ()
|
Returns a copy of this Tractogram object. |
extend (other)
|
Appends the data of another Tractogram . |
to_world ([lazy])
|
Brings the streamlines to world space (i.e. |
-
__init__(streamlines=None, data_per_streamline=None, data_per_point=None, affine_to_rasmm=None)
- Parameters
- streamlinesiterable of ndarrays or
ArraySequence
, optional Sequence of \(T\) streamlines. Each streamline is an ndarray of
shape (\(N_t\), 3) where \(N_t\) is the number of points of
streamline \(t\).
- data_per_streamlinedict of iterable of ndarrays, optional
Dictionary where the items are (str, iterable).
Each key represents an information \(i\) to be kept alongside every
streamline, and its associated value is an iterable of ndarrays of
shape (\(P_i\),) where \(P_i\) is the number of scalar values to store
for that particular information \(i\).
- data_per_pointdict of iterable of ndarrays, optional
Dictionary where the items are (str, iterable).
Each key represents an information \(i\) to be kept alongside every
point of every streamline, and its associated value is an iterable
of ndarrays of shape (\(N_t\), \(M_i\)) where \(N_t\) is the number of
points for a particular streamline \(t\) and \(M_i\) is the number
scalar values to store for that particular information \(i\).
- affine_to_rasmmndarray of shape (4, 4) or None, optional
Transformation matrix that brings the streamlines contained in
this tractogram to RAS+ and mm space where coordinate (0,0,0)
refers to the center of the voxel. By default, the streamlines
are in an unknown space, i.e. affine_to_rasmm is None.
-
property affine_to_rasmm
Affine bringing streamlines in this tractogram to RAS+mm.
-
apply_affine(affine, lazy=False)
Applies an affine transformation on the points of each streamline.
If lazy is not specified, this is performed in-place.
- Parameters
- affinendarray of shape (4, 4)
Transformation that will be applied to every streamline.
- lazy{False, True}, optional
If True, streamlines are not transformed in-place and a
LazyTractogram
object is returned. Otherwise, streamlines
are modified in-place.
- Returns
- tractogram
Tractogram
or LazyTractogram
object Tractogram where the streamlines have been transformed according
to the given affine transformation. If the lazy option is true,
it returns a LazyTractogram
object, otherwise it returns a
reference to this Tractogram
object with updated
streamlines.
-
copy()
Returns a copy of this Tractogram
object.
-
property data_per_point
-
property data_per_streamline
-
extend(other)
Appends the data of another Tractogram
.
Data that will be appended includes the streamlines and the content
of both dictionaries data_per_streamline and data_per_point.
- Parameters
- other
Tractogram
object Its data will be appended to the data of this tractogram.
- Returns
- None
Notes
The entries in both dictionaries self.data_per_streamline and
self.data_per_point must match respectively those contained in
the other tractogram.
-
property streamlines
-
to_world(lazy=False)
Brings the streamlines to world space (i.e. RAS+ and mm).
If lazy is not specified, this is performed in-place.
- Parameters
- lazy{False, True}, optional
If True, streamlines are not transformed in-place and a
LazyTractogram
object is returned. Otherwise, streamlines
are modified in-place.
- Returns
- tractogram
Tractogram
or LazyTractogram
object Tractogram where the streamlines have been sent to world space.
If the lazy option is true, it returns a LazyTractogram
object, otherwise it returns a reference to this
Tractogram
object with updated streamlines.
deepcopy
-
dipy.io.streamline.deepcopy(x, memo=None, _nil=[])
Deep copy operation on arbitrary Python objects.
See the module’s __doc__ string for more info.
is_header_compatible
Will compare the spatial attribute of 2 references
- Parameters
- reference_1Nifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header or trk.header (dict)
Reference that provides the spatial attribute.
- reference_2Nifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header or trk.header (dict)
Reference that provides the spatial attribute.
- Returns
- outputbool
Does all the spatial attribute match
load_dpy
-
dipy.io.streamline.load_dpy(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .dpy format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_fib
-
dipy.io.streamline.load_fib(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .fib format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_generator
-
dipy.io.streamline.load_generator(ttype)
Generate a loading function that performs a file extension
check to restrict the user to a single file format.
- Parameters
- ttypestring
Extension of the file format that requires a loader
- Returns
- ——-
- outputfunction
Function (load_tractogram) that handle only one file format
load_tck
-
dipy.io.streamline.load_tck(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .tck format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_tractogram
-
dipy.io.streamline.load_tractogram(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram from any format (trk/tck/vtk/vtp/fib/dpy)
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_trk
-
dipy.io.streamline.load_trk(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .trk format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_vtk
-
dipy.io.streamline.load_vtk(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .vtk format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
load_vtk_streamlines
-
dipy.io.streamline.load_vtk_streamlines(filename, to_lps=True)
Load streamlines from vtk polydata.
Load formats can be VTK, FIB
- Parameters
- filenamestring
input filename (.vtk or .fib)
- to_lpsbool
Default to True, will follow the vtk file convention for streamlines
Will be supported by MITKDiffusion and MI-Brain
- Returns
- outputlist
list of 2D arrays
load_vtp
-
dipy.io.streamline.load_vtp(filename, reference, to_space=Space.RASMM, to_origin=Origin.NIFTI, bbox_valid_check=True, trk_header_check=True)
Load the stateful tractogram of the .vtp format
- Parameters
- filenamestring
Filename with valid extension
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict), or ‘same’ if the input is a trk file.
Reference that provides the spatial attribute.
Typically a nifti-related object from the native diffusion used for
streamlines generation
- to_spaceEnum (dipy.io.stateful_tractogram.Space)
Space to which the streamlines will be transformed after loading
- to_originEnum (dipy.io.stateful_tractogram.Origin)
- Origin to which the streamlines will be transformed after loading
NIFTI standard, default (center of the voxel)
TRACKVIS standard (corner of the voxel)
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- trk_header_checkbool
Verification that the reference has the same header as the spatial
attributes as the input tractogram when a Trk is loaded
- Returns
- outputStatefulTractogram
The tractogram to load (must have been saved properly)
save_dpy
-
dipy.io.streamline.save_dpy(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .dpy format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_fib
-
dipy.io.streamline.save_fib(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .fib format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_generator
-
dipy.io.streamline.save_generator(ttype)
Generate a saving function that performs a file extension
check to restrict the user to a single file format.
- Parameters
- ttypestring
Extension of the file format that requires a saver
- Returns
- ——-
- outputfunction
Function (save_tractogram) that handle only one file format
save_tck
-
dipy.io.streamline.save_tck(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .tck format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_tractogram
-
dipy.io.streamline.save_tractogram(sft, filename, bbox_valid_check=True)
Save the stateful tractogram in any format (trk/tck/vtk/vtp/fib/dpy)
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_trk
-
dipy.io.streamline.save_trk(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .trk format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_vtk
-
dipy.io.streamline.save_vtk(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .vtk format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
save_vtk_streamlines
-
dipy.io.streamline.save_vtk_streamlines(streamlines, filename, to_lps=True, binary=False)
Save streamlines as vtk polydata to a supported format file.
File formats can be OBJ, VTK, VTP, FIB, PLY, STL and XML
- Parameters
- streamlineslist
list of 2D arrays or ArraySequence
- filenamestring
output filename (.obj, .vtk, .fib, .ply, .stl and .xml)
- to_lpsbool
Default to True, will follow the vtk file convention for streamlines
Will be supported by MITKDiffusion and MI-Brain
- binarybool
save the file as binary
save_vtp
-
dipy.io.streamline.save_vtp(sft, filename, bbox_valid_check=True)
Save the stateful tractogram of the .vtp format
- Parameters
- sftStatefulTractogram
The stateful tractogram to save
- filenamestring
Filename with valid extension
- bbox_valid_checkbool
Verification for negative voxel coordinates or values above the
volume dimensions. Default is True, to enforce valid file.
- Returns
- outputbool
True if the saving operation was successful
-
class dipy.io.utils.Nifti1Image(dataobj, affine, header=None, extra=None, file_map=None)
Bases: nibabel.nifti1.Nifti1Pair
, nibabel.filebasedimages.SerializableImage
Class for single file NIfTI1 format image
- Attributes
- affine
- dataobj
- header
in_memory
True when any array data is in memory cache
- ndim
- shape
slicer
Slicer object that returns cropped and subsampled images
Methods
ImageArrayProxy
|
alias of nibabel.arrayproxy.ArrayProxy |
ImageSlicer
|
alias of nibabel.spatialimages.SpatialFirstSlicer |
as_reoriented (ornt)
|
Apply an orientation change and return a new image |
filespec_to_file_map (filespec)
|
Make file_map for this class from filename filespec |
filespec_to_files (filespec)
|
filespec_to_files class method is deprecated. |
from_bytes (bytestring)
|
Construct image from a byte string |
from_file_map (file_map, *[, mmap, ...])
|
Class method to create image from mapping in file_map |
from_filename (filename, *[, mmap, ...])
|
Class method to create image from filename filename |
from_files (file_map)
|
from_files class method is deprecated. |
from_image (img)
|
Class method to create new instance of own class from img |
get_affine ()
|
Get affine from image |
get_data ([caching])
|
Return image data from image with any necessary scaling applied |
get_fdata ([caching, dtype])
|
Return floating point image data with necessary scaling applied |
get_filename ()
|
Fetch the image filename |
get_header ()
|
Get header from image |
get_qform ([coded])
|
Return 4x4 affine matrix from qform parameters in header |
get_sform ([coded])
|
Return 4x4 affine matrix from sform parameters in header |
get_shape ()
|
Return shape for image |
header_class
|
alias of nibabel.nifti1.Nifti1Header |
instance_to_filename (img, filename)
|
Save img in our own format, to name implied by filename |
load (filename, *[, mmap, keep_file_open])
|
Class method to create image from filename filename |
make_file_map ([mapping])
|
Class method to make files holder for this image type |
orthoview ()
|
Plot the image using OrthoSlicer3D |
path_maybe_image (filename[, sniff, sniff_max])
|
Return True if filename may be image matching this class |
set_filename (filename)
|
Sets the files in the object from a given filename |
set_qform (affine[, code, strip_shears])
|
Set qform header values from 4x4 affine |
set_sform (affine[, code])
|
Set sform transform from 4x4 affine |
to_bytes ()
|
Return a bytes object with the contents of the file that would be written if the image were saved. |
to_file_map ([file_map])
|
Write image to file_map or contained self.file_map |
to_filename (filename)
|
Write image to files implied by filename string |
to_files ([file_map])
|
to_files method is deprecated. |
to_filespec (filename)
|
to_filespec method is deprecated. |
uncache ()
|
Delete any cached read of data from proxied data |
update_header ()
|
Harmonize header with image data and affine |
get_data_dtype |
|
set_data_dtype |
|
-
__init__(dataobj, affine, header=None, extra=None, file_map=None)
Initialize image
The image is a combination of (array-like, affine matrix, header), with
optional metadata in extra, and filename / file-like objects
contained in the file_map mapping.
- Parameters
- dataobjobject
Object containg image data. It should be some object that retuns an
array from np.asanyarray
. It should have a shape
attribute
or property
- affineNone or (4,4) array-like
homogenous affine giving relationship between voxel coordinates and
world coordinates. Affine can also be None. In this case,
obj.affine
also returns None, and the affine as written to disk
will depend on the file format.
- headerNone or mapping or header instance, optional
metadata for this image format
- extraNone or mapping, optional
metadata to associate with image that cannot be stored in the
metadata of this image type
- file_mapmapping, optional
mapping giving file information for this image format
Notes
If both a header and an affine are specified, and the affine does
not match the affine that is in the header, the affine will be used,
but the sform_code
and qform_code
fields in the header will be
re-initialised to their default values. This is performed on the basis
that, if you are changing the affine, you are likely to be changing the
space to which the affine is pointing. The set_sform()
and
set_qform()
methods can be used to update the codes after an image
has been created - see those methods, and the manual for more details.
-
files_types = (('image', '.nii'),)
alias of nibabel.nifti1.Nifti1Header
Harmonize header with image data and affine
-
valid_exts = ('.nii',)
create_tractogram_header
Write a standard trk/tck header from spatial attribute
decfa
-
dipy.io.utils.decfa(img_orig, scale=False)
Create a nifti-compliant directional-encoded color FA image.
- Parameters
- img_origNifti1Image class instance.
Contains encoding of the DEC FA image with a 4D volume of data, where
the elements on the last dimension represent R, G and B components.
- scale: bool.
Whether to scale the incoming data from the 0-1 to the 0-255 range
expected in the output.
- Returns
- imgNifti1Image class instance with dtype set to store tuples of
uint8 in (R, G, B) order.
Notes
For a description of this format, see:
https://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/datatype.html
decfa_to_float
-
dipy.io.utils.decfa_to_float(img_orig)
Convert a nifti-compliant directional-encoded color FA image into a
nifti image with RGB encoded in floating point resolution.
- Parameters
- img_origNifti1Image class instance.
Contains encoding of the DEC FA image with a 3D volume of data, where
each element is a (R, G, B) tuple in uint8.
- Returns
- imgNifti1Image class instance with float dtype.
Notes
For a description of this format, see:
https://nifti.nimh.nih.gov/nifti-1/documentation/nifti1fields/nifti1fields_pages/datatype.html
detect_format
-
dipy.io.utils.detect_format(fileobj)
Returns the StreamlinesFile object guessed from the file-like object.
- Parameters
- fileobjstring or file-like object
If string, a filename; otherwise an open file-like object pointing
to a tractogram file (and ready to read from the beginning of the
header)
- Returns
- tractogram_file
TractogramFile
class The class type guessed from the content of fileobj.
get_reference_info
-
dipy.io.utils.get_reference_info(reference)
Will compare the spatial attribute of 2 references
- Parameters
- referenceNifti or Trk filename, Nifti1Image or TrkFile, Nifti1Header or
trk.header (dict)
Reference that provides the spatial attribute.
- Returns
- outputtuple
affine ndarray (4,4), np.float32, tranformation of VOX to RASMM
dimensions ndarray (3,), int16, volume shape for each axis
voxel_sizes ndarray (3,), float32, size of voxel for each axis
voxel_order, string, Typically ‘RAS’ or ‘LPS’
is_header_compatible
Will compare the spatial attribute of 2 references
- Parameters
- reference_1Nifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header or trk.header (dict)
Reference that provides the spatial attribute.
- reference_2Nifti or Trk filename, Nifti1Image or TrkFile,
Nifti1Header or trk.header (dict)
Reference that provides the spatial attribute.
- Returns
- outputbool
Does all the spatial attribute match
is_reference_info_valid
-
dipy.io.utils.is_reference_info_valid(affine, dimensions, voxel_sizes, voxel_order)
Validate basic data type and value of spatial attribute.
Does not ensure that voxel_sizes and voxel_order are self-coherent with
the affine.
Only verify the following:
affine is of the right type (float) and dimension (4,4)
affine contain values in the rotation part
dimensions is of right type (int) and length (3)
voxel_sizes is of right type (float) and length (3)
voxel_order is of right type (str) and length (3)
The listed parameters are what is expected, provide something else and this
function should fail (cover common mistakes).
- Parameters
- affine: ndarray (4,4)
Tranformation of VOX to RASMM
- dimensions: ndarray (3,), int16
Volume shape for each axis
- voxel_sizes: ndarray (3,), float32
Size of voxel for each axis
- voxel_order: string
Typically ‘RAS’ or ‘LPS’
- Returns
- outputbool
Does the input represent a valid ‘state’ of spatial attribute
make5d
-
dipy.io.utils.make5d(input)
reshapes the input to have 5 dimensions, adds extra dimensions just
before the last dimession
nifti1_symmat
-
dipy.io.utils.nifti1_symmat(image_data, *args, **kwargs)
Returns a Nifti1Image with a symmetric matrix intent
- Parameters
- image_dataarray-like
should have lower triangular elements of a symmetric matrix along the
last dimension
- all other arguments and keywords are passed to Nifti1Image
- Returns
- imageNifti1Image
5d, extra dimensions addes before the last. Has symmetric matrix intent
code
optional_package
-
dipy.io.utils.optional_package(name, trip_msg=None)
Return package-like thing and module setup for package name
- Parameters
- namestr
package name
- trip_msgNone or str
message to give when someone tries to use the return package, but we
could not import it, and have returned a TripWire object instead.
Default message if None.
- Returns
- pkg_likemodule or
TripWire
instance If we can import the package, return it. Otherwise return an object
raising an error when accessed
- have_pkgbool
True if import for package was successful, false otherwise
- module_setupfunction
callable usually set as setup_module
in calling namespace, to allow
skipping tests.
Examples
Typical use would be something like this at the top of a module using an
optional package:
>>> from dipy.utils.optpkg import optional_package
>>> pkg, have_pkg, setup_module = optional_package('not_a_package')
Of course in this case the package doesn’t exist, and so, in the module:
and
>>> pkg.some_function()
Traceback (most recent call last):
...
TripWireError: We need package not_a_package for these functions, but
``import not_a_package`` raised an ImportError
If the module does exist - we get the module
>>> pkg, _, _ = optional_package('os')
>>> hasattr(pkg, 'path')
True
Or a submodule if that’s what we asked for
>>> subpkg, _, _ = optional_package('os.path')
>>> hasattr(subpkg, 'dirname')
True
read_img_arr_or_path
-
dipy.io.utils.read_img_arr_or_path(data, affine=None)
Helper function that handles inputs that can be paths, nifti img or arrays
- Parameters
- dataarray or nib.Nifti1Image or str.
Either as a 3D/4D array or as a nifti image object, or as
a string containing the full path to a nifti file.
- affine4x4 array, optional.
Must be provided for data provided as an array. If provided together
with Nifti1Image or str data, this input will over-ride the affine
that is stored in the data input. Default: use the affine stored
in data.
- Returns
- data, affinendarray and 4x4 array
save_buan_profiles_hdf5
-
dipy.io.utils.save_buan_profiles_hdf5(fname, dt)
Saves the given input dataframe to .h5 file
- Parameters
- fnamestring
file name for saving the hdf5 file
- dtPandas DataFrame
DataFrame to be saved as .h5 file
load_polydata
-
dipy.io.vtk.load_polydata(file_name)
Load a vtk polydata to a supported format file.
Supported file formats are OBJ, VTK, VTP, FIB, PLY, STL and XML
- Parameters
- file_namestring
- Returns
- outputvtkPolyData
load_vtk_streamlines
-
dipy.io.vtk.load_vtk_streamlines(filename, to_lps=True)
Load streamlines from vtk polydata.
Load formats can be VTK, FIB
- Parameters
- filenamestring
input filename (.vtk or .fib)
- to_lpsbool
Default to True, will follow the vtk file convention for streamlines
Will be supported by MITKDiffusion and MI-Brain
- Returns
- outputlist
list of 2D arrays
optional_package
-
dipy.io.vtk.optional_package(name, trip_msg=None)
Return package-like thing and module setup for package name
- Parameters
- namestr
package name
- trip_msgNone or str
message to give when someone tries to use the return package, but we
could not import it, and have returned a TripWire object instead.
Default message if None.
- Returns
- pkg_likemodule or
TripWire
instance If we can import the package, return it. Otherwise return an object
raising an error when accessed
- have_pkgbool
True if import for package was successful, false otherwise
- module_setupfunction
callable usually set as setup_module
in calling namespace, to allow
skipping tests.
Examples
Typical use would be something like this at the top of a module using an
optional package:
>>> from dipy.utils.optpkg import optional_package
>>> pkg, have_pkg, setup_module = optional_package('not_a_package')
Of course in this case the package doesn’t exist, and so, in the module:
and
>>> pkg.some_function()
Traceback (most recent call last):
...
TripWireError: We need package not_a_package for these functions, but
``import not_a_package`` raised an ImportError
If the module does exist - we get the module
>>> pkg, _, _ = optional_package('os')
>>> hasattr(pkg, 'path')
True
Or a submodule if that’s what we asked for
>>> subpkg, _, _ = optional_package('os.path')
>>> hasattr(subpkg, 'dirname')
True
save_polydata
-
dipy.io.vtk.save_polydata(polydata, file_name, binary=False, color_array_name=None)
Save a vtk polydata to a supported format file.
Save formats can be VTK, VTP, FIB, PLY, STL and XML.
- Parameters
- polydatavtkPolyData
- file_namestring
save_vtk_streamlines
-
dipy.io.vtk.save_vtk_streamlines(streamlines, filename, to_lps=True, binary=False)
Save streamlines as vtk polydata to a supported format file.
File formats can be OBJ, VTK, VTP, FIB, PLY, STL and XML
- Parameters
- streamlineslist
list of 2D arrays or ArraySequence
- filenamestring
output filename (.obj, .vtk, .fib, .ply, .stl and .xml)
- to_lpsbool
Default to True, will follow the vtk file convention for streamlines
Will be supported by MITKDiffusion and MI-Brain
- binarybool
save the file as binary
setup_module
-
dipy.io.vtk.setup_module()