def create_bedpostx_pipeline(name="bedpostx"):
"""Creates a pipeline that does the same as bedpostx script from FSL -
calculates diffusion model parameters (distributions not MLE) voxelwise for
the whole volume (by splitting it slicewise).
Example
-------
>>> nipype_bedpostx = create_bedpostx_pipeline("nipype_bedpostx")
>>> nipype_bedpostx.inputs.inputnode.dwi = 'diffusion.nii'
>>> nipype_bedpostx.inputs.inputnode.mask = 'mask.nii'
>>> nipype_bedpostx.inputs.inputnode.bvecs = 'bvecs'
>>> nipype_bedpostx.inputs.inputnode.bvals = 'bvals'
>>> nipype_bedpostx.inputs.xfibres.n_fibres = 2
>>> nipype_bedpostx.inputs.xfibres.fudge = 1
>>> nipype_bedpostx.inputs.xfibres.burn_in = 1000
>>> nipype_bedpostx.inputs.xfibres.n_jumps = 1250
>>> nipype_bedpostx.inputs.xfibres.sample_every = 25
>>> nipype_bedpostx.run() # doctest: +SKIP
Inputs::
inputnode.dwi
inputnode.mask
Outputs::
outputnode.thsamples
outputnode.phsamples
outputnode.fsamples
outputnode.mean_thsamples
outputnode.mean_phsamples
outputnode.mean_fsamples
outputnode.dyads
outputnode.dyads_dispersion
"""
inputnode = pe.Node(
interface=util.IdentityInterface(fields=["dwi", "mask"]),
name="inputnode")
mask_dwi = pe.Node(interface=fsl.ImageMaths(op_string="-mas"),
name="mask_dwi")
slice_dwi = pe.Node(interface=fsl.Split(dimension="z"), name="slice_dwi")
slice_mask = pe.Node(interface=fsl.Split(dimension="z"),
name="slice_mask")
preproc = pe.Workflow(name="preproc")
preproc.connect([(inputnode, mask_dwi, [('dwi', 'in_file')]),
(inputnode, mask_dwi, [('mask', 'in_file2')]),
(mask_dwi, slice_dwi, [('out_file', 'in_file')]),
(inputnode, slice_mask, [('mask', 'in_file')])
])
xfibres = pe.MapNode(interface=fsl.XFibres(), name="xfibres",
iterfield=['dwi', 'mask'])
# Normal set of parameters
xfibres.inputs.n_fibres = 2
xfibres.inputs.fudge = 1
xfibres.inputs.burn_in = 1000
xfibres.inputs.n_jumps = 1250
xfibres.inputs.sample_every = 25
xfibres.inputs.model = 1
xfibres.inputs.non_linear = True
xfibres.inputs.update_proposal_every = 24
inputnode = pe.Node(interface=util.IdentityInterface(fields=["thsamples",
"phsamples",
"fsamples",
"dyads",
"mean_dsamples",
"mask"]),
name="inputnode")
merge_thsamples = pe.MapNode(fsl.Merge(dimension="z"),
name="merge_thsamples", iterfield=['in_files'])
merge_phsamples = pe.MapNode(fsl.Merge(dimension="z"),
name="merge_phsamples", iterfield=['in_files'])
merge_fsamples = pe.MapNode(fsl.Merge(dimension="z"),
name="merge_fsamples", iterfield=['in_files'])
merge_mean_dsamples = pe.Node(fsl.Merge(dimension="z"),
name="merge_mean_dsamples")
mean_thsamples = pe.MapNode(fsl.ImageMaths(op_string="-Tmean"),
name="mean_thsamples", iterfield=['in_file'])
mean_phsamples = pe.MapNode(fsl.ImageMaths(op_string="-Tmean"),
name="mean_phsamples", iterfield=['in_file'])
mean_fsamples = pe.MapNode(fsl.ImageMaths(op_string="-Tmean"),
name="mean_fsamples", iterfield=['in_file'])
make_dyads = pe.MapNode(fsl.MakeDyadicVectors(), name="make_dyads",
iterfield=['theta_vol', 'phi_vol'])
postproc = pe.Workflow(name="postproc")
postproc.connect(
[(inputnode, merge_thsamples, [(('thsamples', transpose), 'in_files')]),
(inputnode, merge_phsamples, [((
'phsamples', transpose), 'in_files')]),
(inputnode, merge_fsamples, [((
'fsamples', transpose), 'in_files')]),
(inputnode, merge_mean_dsamples, [
('mean_dsamples', 'in_files')]),
(merge_thsamples, mean_thsamples, [
('merged_file', 'in_file')]),
(merge_phsamples, mean_phsamples, [
('merged_file', 'in_file')]),
(merge_fsamples, mean_fsamples, [
('merged_file', 'in_file')]),
(merge_thsamples, make_dyads, [
('merged_file', 'theta_vol')]),
(merge_phsamples, make_dyads, [
('merged_file', 'phi_vol')]),
(inputnode, make_dyads, [('mask', 'mask')]),
])
inputnode = pe.Node(interface=util.IdentityInterface(fields=["dwi",
"mask",
"bvecs",
"bvals"]),
name="inputnode")
bedpostx = pe.Workflow(name=name)
bedpostx.connect([(inputnode, preproc, [('mask', 'inputnode.mask')]),
(inputnode, preproc, [('dwi', 'inputnode.dwi')]),
(preproc, xfibres, [('slice_dwi.out_files', 'dwi'),
('slice_mask.out_files', 'mask')]),
(inputnode, xfibres, [('bvals', 'bvals')]),
(inputnode, xfibres, [('bvecs', 'bvecs')]),
(inputnode, postproc, [('mask', 'inputnode.mask')]),
(xfibres, postproc, [
('thsamples', 'inputnode.thsamples'),
('phsamples',
'inputnode.phsamples'),
('fsamples', 'inputnode.fsamples'),
('dyads', 'inputnode.dyads'),
('mean_dsamples', 'inputnode.mean_dsamples')]),
])
outputnode = pe.Node(
interface=util.IdentityInterface(fields=["thsamples",
"phsamples",
"fsamples",
"mean_thsamples",
"mean_phsamples",
"mean_fsamples",
"dyads",
"dyads_dispersion"]),
name="outputnode")
bedpostx.connect(
[(postproc, outputnode, [("merge_thsamples.merged_file", "thsamples"),
("merge_phsamples.merged_file",
"phsamples"),
("merge_fsamples.merged_file",
"fsamples"),
("mean_thsamples.out_file",
"mean_thsamples"),
("mean_phsamples.out_file",
"mean_phsamples"),
("mean_fsamples.out_file",
"mean_fsamples"),
("make_dyads.dyads", "dyads"),
("make_dyads.dispersion", "dyads_dispersion")])
])
return bedpostx
def create_bedpostx_pipeline(
name='bedpostx',
params={
'n_fibres': 2,
'fudge': 1,
'burn_in': 1000,
'n_jumps': 1250,
'sample_every': 25,
'model': 1,
'cnlinear': True
}):
"""
Creates a pipeline that does the same as bedpostx script from FSL -
calculates diffusion model parameters (distributions not MLE) voxelwise for
the whole volume (by splitting it slicewise).
Example
-------
>>> from nipype.workflows.dmri.fsl.dti import create_bedpostx_pipeline
>>> params = dict(n_fibres = 2, fudge = 1, burn_in = 1000,
... n_jumps = 1250, sample_every = 25)
>>> bpwf = create_bedpostx_pipeline('nipype_bedpostx', params)
>>> bpwf.inputs.inputnode.dwi = 'diffusion.nii'
>>> bpwf.inputs.inputnode.mask = 'mask.nii'
>>> bpwf.inputs.inputnode.bvecs = 'bvecs'
>>> bpwf.inputs.inputnode.bvals = 'bvals'
>>> bpwf.run() # doctest: +SKIP
Inputs::
inputnode.dwi
inputnode.mask
inputnode.bvecs
inputnode.bvals
Outputs::
outputnode wraps all XFibres outputs
"""
inputnode = pe.Node(
niu.IdentityInterface(fields=['dwi', 'mask', 'bvecs', 'bvals']),
name='inputnode')
slice_dwi = pe.Node(fsl.Split(dimension='z'), name='slice_dwi')
slice_msk = pe.Node(fsl.Split(dimension='z'), name='slice_msk')
mask_dwi = pe.MapNode(fsl.ImageMaths(op_string='-mas'),
iterfield=['in_file', 'in_file2'],
name='mask_dwi')
xfib_if = fsl.XFibres(**params)
xfibres = pe.MapNode(xfib_if, name='xfibres', iterfield=['dwi', 'mask'])
make_dyads = pe.MapNode(fsl.MakeDyadicVectors(),
name="make_dyads",
iterfield=['theta_vol', 'phi_vol'])
out_fields = [
'dyads', 'dyads_disp', 'thsamples', 'phsamples', 'fsamples',
'mean_thsamples', 'mean_phsamples', 'mean_fsamples'
]
outputnode = pe.Node(niu.IdentityInterface(fields=out_fields),
name='outputnode')
wf = pe.Workflow(name=name)
wf.connect([(inputnode, slice_dwi, [('dwi', 'in_file')]),
(inputnode, slice_msk, [('mask', 'in_file')]),
(slice_dwi, mask_dwi, [('out_files', 'in_file')]),
(slice_msk, mask_dwi, [('out_files', 'in_file2')]),
(slice_dwi, xfibres, [('out_files', 'dwi')]),
(mask_dwi, xfibres, [('out_file', 'mask')]),
(inputnode, xfibres, [('bvecs', 'bvecs'), ('bvals', 'bvals')]),
(inputnode, make_dyads, [('mask', 'mask')])])
mms = {}
for k in ['thsamples', 'phsamples', 'fsamples']:
mms[k] = merge_and_mean(k)
wf.connect([(xfibres, mms[k], [(k, 'inputnode.in_files')]),
(mms[k], outputnode, [('outputnode.merged', k),
('outputnode.mean', 'mean_%s' % k)])
])
# m_mdsamples = pe.Node(fsl.Merge(dimension="z"),
# name="merge_mean_dsamples")
wf.connect([
(mms['thsamples'], make_dyads, [('outputnode.merged', 'theta_vol')]),
(mms['phsamples'], make_dyads, [('outputnode.merged', 'phi_vol')]),
#(xfibres, m_mdsamples, [('mean_dsamples', 'in_files')]),
(make_dyads, outputnode, [('dyads', 'dyads'),
('dispersion', 'dyads_disp')])
])
return wf