def dmri_moco(param):
file_data = 'dmri'
ext_data = '.nii'
file_b0 = 'b0'
file_dwi = 'dwi'
mat_final = 'mat_final/'
file_dwi_group = 'dwi_averaged_groups' # no extension
fsloutput = 'export FSLOUTPUTTYPE=NIFTI; ' # for faster processing, all outputs are in NIFTI
ext_mat = 'Warp.nii.gz' # warping field
# Get dimensions of data
sct.printv('\nGet dimensions of data...', param.verbose)
nx, ny, nz, nt, px, py, pz, pt = Image(file_data+'.nii').dim
sct.printv(' ' + str(nx) + ' x ' + str(ny) + ' x ' + str(nz), param.verbose)
# Identify b=0 and DWI images
sct.printv('\nIdentify b=0 and DWI images...', param.verbose)
index_b0, index_dwi, nb_b0, nb_dwi = identify_b0('bvecs.txt', param.fname_bvals, param.bval_min, param.verbose)
# check if dmri and bvecs are the same size
if not nb_b0 + nb_dwi == nt:
sct.printv('\nERROR in '+os.path.basename(__file__)+': Size of data ('+str(nt)+') and size of bvecs ('+str(nb_b0+nb_dwi)+') are not the same. Check your bvecs file.\n', 1, 'error')
sys.exit(2)
# Prepare NIFTI (mean/groups...)
#===================================================================================================================
# Split into T dimension
sct.printv('\nSplit along T dimension...', param.verbose)
status, output = sct.run('sct_split_data -i ' + file_data + ext_data + ' -dim t -suffix _T', param.verbose)
# Merge b=0 images
sct.printv('\nMerge b=0...', param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_b0
# for it in range(nb_b0):
# cmd = cmd + ' ' + file_data + '_T' + str(index_b0[it]).zfill(4)
cmd = 'sct_concat_data -dim t -o ' + file_b0 + ext_data + ' -i '
for it in range(nb_b0):
cmd = cmd + file_data + '_T' + str(index_b0[it]).zfill(4) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
status, output = sct.run(cmd, param.verbose)
sct.printv((' File created: ' + file_b0), param.verbose)
# Average b=0 images
sct.printv('\nAverage b=0...', param.verbose)
file_b0_mean = file_b0+'_mean'
sct.run('sct_maths -i '+file_b0+'.nii'+' -o '+file_b0_mean+'.nii'+' -mean t', param.verbose)
# if not average_data_across_dimension(file_b0+'.nii', file_b0_mean+'.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# cmd = fsloutput + 'fslmaths ' + file_b0 + ' -Tmean ' + file_b0_mean
# status, output = sct.run(cmd, param.verbose)
# Number of DWI groups
nb_groups = int(math.floor(nb_dwi/param.group_size))
# Generate groups indexes
group_indexes = []
for iGroup in range(nb_groups):
group_indexes.append(index_dwi[(iGroup*param.group_size):((iGroup+1)*param.group_size)])
# add the remaining images to the last DWI group
nb_remaining = nb_dwi%param.group_size # number of remaining images
if nb_remaining > 0:
nb_groups += 1
group_indexes.append(index_dwi[len(index_dwi)-nb_remaining:len(index_dwi)])
# DWI groups
for iGroup in range(nb_groups):
sct.printv('\nDWI group: ' +str((iGroup+1))+'/'+str(nb_groups), param.verbose)
# get index
index_dwi_i = group_indexes[iGroup]
nb_dwi_i = len(index_dwi_i)
# Merge DW Images
sct.printv('Merge DW images...', param.verbose)
file_dwi_merge_i = file_dwi + '_' + str(iGroup)
cmd = 'sct_concat_data -dim t -o ' + file_dwi_merge_i + ext_data + ' -i '
for it in range(nb_dwi_i):
cmd = cmd + file_data + '_T' + str(index_dwi_i[it]).zfill(4) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
sct.run(cmd, param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_dwi_merge_i
# for it in range(nb_dwi_i):
# cmd = cmd +' ' + file_data + '_T' + str(index_dwi_i[it]).zfill(4)
# Average DW Images
sct.printv('Average DW images...', param.verbose)
file_dwi_mean = file_dwi + '_mean_' + str(iGroup)
sct.run('sct_maths -i '+file_dwi_merge_i+'.nii'+' -o '+file_dwi_mean+'.nii'+' -mean t', param.verbose)
# if not average_data_across_dimension(file_dwi_merge_i+'.nii', file_dwi_mean+'.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# cmd = fsloutput + 'fslmaths ' + file_dwi_merge_i + ' -Tmean ' + file_dwi_mean
# sct.run(cmd, param.verbose)
# Merge DWI groups means
sct.printv('\nMerging DW files...', param.verbose)
# file_dwi_groups_means_merge = 'dwi_averaged_groups'
cmd = 'sct_concat_data -dim t -o ' + file_dwi_group + ext_data + ' -i '
for iGroup in range(nb_groups):
cmd = cmd + file_dwi + '_mean_' + str(iGroup) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
sct.run(cmd, param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_dwi_group
# for iGroup in range(nb_groups):
# cmd = cmd + ' ' + file_dwi + '_mean_' + str(iGroup)
# Average DW Images
# TODO: USEFULL ???
sct.printv('\nAveraging all DW images...', param.verbose)
fname_dwi_mean = 'dwi_mean'
sct.run('sct_maths -i '+file_dwi_group+'.nii'+' -o '+file_dwi_group+'_mean.nii'+' -mean t', param.verbose)
# if not average_data_across_dimension(file_dwi_group+'.nii', file_dwi_group+'_mean.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# sct.run(fsloutput + 'fslmaths ' + file_dwi_group + ' -Tmean ' + file_dwi_group+'_mean', param.verbose)
# segment dwi images using otsu algorithm
if param.otsu:
sct.printv('\nSegment group DWI using OTSU algorithm...', param.verbose)
# import module
otsu = importlib.import_module('sct_otsu')
# get class from module
param_otsu = otsu.param() #getattr(otsu, param)
param_otsu.fname_data = file_dwi_group+'.nii'
param_otsu.threshold = param.otsu
param_otsu.file_suffix = '_seg'
# run otsu
otsu.otsu(param_otsu)
file_dwi_group = file_dwi_group+'_seg'
# extract first DWI volume as target for registration
nii = Image(file_dwi_group+'.nii')
data_crop = nii.data[:, :, :, index_dwi[0]:index_dwi[0]+1]
nii.data = data_crop
nii.setFileName('target_dwi.nii')
nii.save()
# START MOCO
#===================================================================================================================
# Estimate moco on b0 groups
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Estimating motion on b=0 images...', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco = param
param_moco.file_data = 'b0'
if index_dwi[0] != 0:
# If first DWI is not the first volume (most common), then there is a least one b=0 image before. In that case
# select it as the target image for registration of all b=0
param_moco.file_target = file_data + '_T' + str(index_b0[index_dwi[0]-1]).zfill(4)
else:
# If first DWI is the first volume, then the target b=0 is the first b=0 from the index_b0.
param_moco.file_target = file_data + '_T' + str(index_b0[0]).zfill(4)
param_moco.path_out = ''
param_moco.todo = 'estimate'
param_moco.mat_moco = 'mat_b0groups'
moco.moco(param_moco)
# Estimate moco on dwi groups
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Estimating motion on DW images...', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco.file_data = file_dwi_group
param_moco.file_target = 'target_dwi' # target is the first DW image (closest to the first b=0)
param_moco.path_out = ''
#param_moco.todo = 'estimate'
param_moco.todo = 'estimate_and_apply'
param_moco.mat_moco = 'mat_dwigroups'
moco.moco(param_moco)
# create final mat folder
sct.create_folder(mat_final)
# Copy b=0 registration matrices
sct.printv('\nCopy b=0 registration matrices...', param.verbose)
for it in range(nb_b0):
sct.run('cp '+'mat_b0groups/'+'mat.T'+str(it)+ext_mat+' '+mat_final+'mat.T'+str(index_b0[it])+ext_mat, param.verbose)
# Copy DWI registration matrices
sct.printv('\nCopy DWI registration matrices...', param.verbose)
for iGroup in range(nb_groups):
for dwi in range(len(group_indexes[iGroup])):
sct.run('cp '+'mat_dwigroups/'+'mat.T'+str(iGroup)+ext_mat+' '+mat_final+'mat.T'+str(group_indexes[iGroup][dwi])+ext_mat, param.verbose)
# Spline Regularization along T
if param.spline_fitting:
moco.spline(mat_final, nt, nz, param.verbose, np.array(index_b0), param.plot_graph)
# combine Eddy Matrices
if param.run_eddy:
param.mat_2_combine = 'mat_eddy'
param.mat_final = mat_final
moco.combine_matrix(param)
# Apply moco on all dmri data
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Apply moco', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco.file_data = 'dmri'
param_moco.file_target = file_dwi+'_mean_'+str(0) # reference for reslicing into proper coordinate system
param_moco.path_out = ''
param_moco.mat_moco = mat_final
param_moco.todo = 'apply'
moco.moco(param_moco)
# copy geometric information from header
# NB: this is required because WarpImageMultiTransform in 2D mode wrongly sets pixdim(3) to "1".
copy_header('dmri.nii', 'dmri_moco.nii')
# generate b0_moco_mean and dwi_moco_mean
cmd = 'sct_dmri_separate_b0_and_dwi -i dmri'+param.suffix+'.nii -b bvecs.txt -a 1'
if not param.fname_bvals == '':
cmd = cmd+' -m '+param.fname_bvals
sct.run(cmd, param.verbose)
def dmri_moco(param):
file_data = 'dmri.nii'
file_data_dirname, file_data_basename, file_data_ext = sct.extract_fname(file_data)
file_b0 = 'b0.nii'
file_dwi = 'dwi.nii'
ext_data = '.nii.gz' # workaround "too many open files" by slurping the data
mat_final = 'mat_final/'
file_dwi_group = 'dwi_averaged_groups.nii'
ext_mat = 'Warp.nii.gz' # warping field
# Get dimensions of data
sct.printv('\nGet dimensions of data...', param.verbose)
im_data = Image(file_data)
nx, ny, nz, nt, px, py, pz, pt = im_data.dim
sct.printv(' ' + str(nx) + ' x ' + str(ny) + ' x ' + str(nz), param.verbose)
# Identify b=0 and DWI images
index_b0, index_dwi, nb_b0, nb_dwi = sct_dmri_separate_b0_and_dwi.identify_b0('bvecs.txt', param.fname_bvals, param.bval_min, param.verbose)
# check if dmri and bvecs are the same size
if not nb_b0 + nb_dwi == nt:
sct.printv('\nERROR in ' + os.path.basename(__file__) + ': Size of data (' + str(nt) + ') and size of bvecs (' + str(nb_b0 + nb_dwi) + ') are not the same. Check your bvecs file.\n', 1, 'error')
sys.exit(2)
# Prepare NIFTI (mean/groups...)
#===================================================================================================================
# Split into T dimension
sct.printv('\nSplit along T dimension...', param.verbose)
im_data_split_list = split_data(im_data, 3)
for im in im_data_split_list:
x_dirname, x_basename, x_ext = sct.extract_fname(im.absolutepath)
im.absolutepath = os.path.join(x_dirname, x_basename + ".nii.gz")
im.save()
# Merge b=0 images
sct.printv('\nMerge b=0...', param.verbose)
im_b0_list = []
for it in range(nb_b0):
im_b0_list.append(im_data_split_list[index_b0[it]])
im_b0_out = concat_data(im_b0_list, 3).save(file_b0)
sct.printv((' File created: ' + file_b0), param.verbose)
# Average b=0 images
sct.printv('\nAverage b=0...', param.verbose)
file_b0_mean = sct.add_suffix(file_b0, '_mean')
sct.run(['sct_maths', '-i', file_b0, '-o', file_b0_mean, '-mean', 't'], param.verbose)
# Number of DWI groups
nb_groups = int(math.floor(nb_dwi / param.group_size))
# Generate groups indexes
group_indexes = []
for iGroup in range(nb_groups):
group_indexes.append(index_dwi[(iGroup * param.group_size):((iGroup + 1) * param.group_size)])
# add the remaining images to the last DWI group
nb_remaining = nb_dwi%param.group_size # number of remaining images
if nb_remaining > 0:
nb_groups += 1
group_indexes.append(index_dwi[len(index_dwi) - nb_remaining:len(index_dwi)])
file_dwi_dirname, file_dwi_basename, file_dwi_ext = sct.extract_fname(file_dwi)
# DWI groups
file_dwi_mean = []
for iGroup in tqdm(range(nb_groups), unit='iter', unit_scale=False, desc="Merge within groups", ascii=True, ncols=80):
# get index
index_dwi_i = group_indexes[iGroup]
nb_dwi_i = len(index_dwi_i)
# Merge DW Images
file_dwi_merge_i = os.path.join(file_dwi_dirname, file_dwi_basename + '_' + str(iGroup) + ext_data)
im_dwi_list = []
for it in range(nb_dwi_i):
im_dwi_list.append(im_data_split_list[index_dwi_i[it]])
im_dwi_out = concat_data(im_dwi_list, 3).save(file_dwi_merge_i)
# Average DW Images
file_dwi_mean_i = os.path.join(file_dwi_dirname, file_dwi_basename + '_mean_' + str(iGroup) + ext_data)
file_dwi_mean.append(file_dwi_mean_i)
sct.run(["sct_maths", "-i", file_dwi_merge_i, "-o", file_dwi_mean[iGroup], "-mean", "t"], 0)
# Merge DWI groups means
sct.printv('\nMerging DW files...', param.verbose)
# file_dwi_groups_means_merge = 'dwi_averaged_groups'
im_dw_list = []
for iGroup in range(nb_groups):
im_dw_list.append(file_dwi_mean[iGroup])
im_dw_out = concat_data(im_dw_list, 3).save(file_dwi_group)
# Average DW Images
# TODO: USEFULL ???
sct.printv('\nAveraging all DW images...', param.verbose)
sct.run(["sct_maths", "-i", file_dwi_group, "-o", file_dwi_group + '_mean' + ext_data, "-mean", "t"], param.verbose)
# segment dwi images using otsu algorithm
if param.otsu:
sct.printv('\nSegment group DWI using OTSU algorithm...', param.verbose)
# import module
otsu = importlib.import_module('sct_otsu')
# get class from module
param_otsu = otsu.param() #getattr(otsu, param)
param_otsu.fname_data = file_dwi_group
param_otsu.threshold = param.otsu
param_otsu.file_suffix = '_seg'
# run otsu
otsu.otsu(param_otsu)
file_dwi_group = file_dwi_group + '_seg.nii'
# START MOCO
#===================================================================================================================
# Estimate moco on b0 groups
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Estimating motion on b=0 images...', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco = param
param_moco.file_data = 'b0.nii'
# identify target image
if index_dwi[0] != 0:
# If first DWI is not the first volume (most common), then there is a least one b=0 image before. In that case
# select it as the target image for registration of all b=0
param_moco.file_target = os.path.join(file_data_dirname, file_data_basename + '_T' + str(index_b0[index_dwi[0] - 1]).zfill(4) + ext_data)
else:
# If first DWI is the first volume, then the target b=0 is the first b=0 from the index_b0.
param_moco.file_target = os.path.join(file_data_dirname, file_data_basename + '_T' + str(index_b0[0]).zfill(4) + ext_data)
param_moco.path_out = ''
param_moco.todo = 'estimate'
param_moco.mat_moco = 'mat_b0groups'
file_mat_b0 = moco.moco(param_moco)
# Estimate moco on dwi groups
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Estimating motion on DW images...', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco.file_data = file_dwi_group
param_moco.file_target = file_dwi_mean[0] # target is the first DW image (closest to the first b=0)
param_moco.path_out = ''
param_moco.todo = 'estimate_and_apply'
param_moco.mat_moco = 'mat_dwigroups'
file_mat_dwi = moco.moco(param_moco)
# create final mat folder
sct.create_folder(mat_final)
# Copy b=0 registration matrices
# TODO: use file_mat_b0 and file_mat_dwi instead of the hardcoding below
sct.printv('\nCopy b=0 registration matrices...', param.verbose)
for it in range(nb_b0):
sct.copy('mat_b0groups/' + 'mat.Z0000T' + str(it).zfill(4) + ext_mat,
mat_final + 'mat.Z0000T' + str(index_b0[it]).zfill(4) + ext_mat)
# Copy DWI registration matrices
sct.printv('\nCopy DWI registration matrices...', param.verbose)
for iGroup in range(nb_groups):
for dwi in range(len(group_indexes[iGroup])): # we cannot use enumerate because group_indexes has 2 dim.
sct.copy('mat_dwigroups/' + 'mat.Z0000T' + str(iGroup).zfill(4) + ext_mat,
mat_final + 'mat.Z0000T' + str(group_indexes[iGroup][dwi]).zfill(4) + ext_mat)
# Spline Regularization along T
if param.spline_fitting:
moco.spline(mat_final, nt, nz, param.verbose, np.array(index_b0), param.plot_graph)
# combine Eddy Matrices
if param.run_eddy:
param.mat_2_combine = 'mat_eddy'
param.mat_final = mat_final
moco.combine_matrix(param)
# Apply moco on all dmri data
sct.printv('\n-------------------------------------------------------------------------------', param.verbose)
sct.printv(' Apply moco', param.verbose)
sct.printv('-------------------------------------------------------------------------------', param.verbose)
param_moco.file_data = file_data
param_moco.file_target = os.path.join(file_dwi_dirname, file_dwi_basename + '_mean_' + str(0) + ext_data) # reference for reslicing into proper coordinate system
param_moco.path_out = ''
param_moco.mat_moco = mat_final
param_moco.todo = 'apply'
moco.moco(param_moco)
# copy geometric information from header
# NB: this is required because WarpImageMultiTransform in 2D mode wrongly sets pixdim(3) to "1".
im_dmri = Image(file_data)
fname_data_moco = os.path.join(file_data_dirname, file_data_basename + param.suffix + '.nii')
im_dmri_moco = Image(fname_data_moco)
im_dmri_moco.header = im_dmri.header
im_dmri_moco.save()
return os.path.abspath(fname_data_moco)
def dmri_moco(param):
file_data = 'dmri.nii'
file_data_dirname, file_data_basename, file_data_ext = sct.extract_fname(
file_data)
file_b0 = 'b0.nii'
file_dwi = 'dwi.nii'
ext_data = '.nii.gz' # workaround "too many open files" by slurping the data
mat_final = 'mat_final/'
file_dwi_group = 'dwi_averaged_groups.nii'
ext_mat = 'Warp.nii.gz' # warping field
# Get dimensions of data
sct.printv('\nGet dimensions of data...', param.verbose)
im_data = Image(file_data)
nx, ny, nz, nt, px, py, pz, pt = im_data.dim
sct.printv(' ' + str(nx) + ' x ' + str(ny) + ' x ' + str(nz),
param.verbose)
# Identify b=0 and DWI images
index_b0, index_dwi, nb_b0, nb_dwi = sct_dmri_separate_b0_and_dwi.identify_b0(
'bvecs.txt', param.fname_bvals, param.bval_min, param.verbose)
# check if dmri and bvecs are the same size
if not nb_b0 + nb_dwi == nt:
sct.printv(
'\nERROR in ' + os.path.basename(__file__) + ': Size of data (' +
str(nt) + ') and size of bvecs (' + str(nb_b0 + nb_dwi) +
') are not the same. Check your bvecs file.\n', 1, 'error')
sys.exit(2)
# Prepare NIFTI (mean/groups...)
#===================================================================================================================
# Split into T dimension
sct.printv('\nSplit along T dimension...', param.verbose)
im_data_split_list = split_data(im_data, 3)
for im in im_data_split_list:
x_dirname, x_basename, x_ext = sct.extract_fname(im.absolutepath)
im.absolutepath = os.path.join(x_dirname, x_basename + ".nii.gz")
im.save()
# Merge b=0 images
sct.printv('\nMerge b=0...', param.verbose)
im_b0_list = []
for it in range(nb_b0):
im_b0_list.append(im_data_split_list[index_b0[it]])
im_b0_out = concat_data(im_b0_list, 3).save(file_b0)
sct.printv((' File created: ' + file_b0), param.verbose)
# Average b=0 images
sct.printv('\nAverage b=0...', param.verbose)
file_b0_mean = sct.add_suffix(file_b0, '_mean')
sct.run(['sct_maths', '-i', file_b0, '-o', file_b0_mean, '-mean', 't'],
param.verbose)
# Number of DWI groups
nb_groups = int(math.floor(nb_dwi / param.group_size))
# Generate groups indexes
group_indexes = []
for iGroup in range(nb_groups):
group_indexes.append(index_dwi[(iGroup *
param.group_size):((iGroup + 1) *
param.group_size)])
# add the remaining images to the last DWI group
nb_remaining = nb_dwi % param.group_size # number of remaining images
if nb_remaining > 0:
nb_groups += 1
group_indexes.append(index_dwi[len(index_dwi) -
nb_remaining:len(index_dwi)])
file_dwi_dirname, file_dwi_basename, file_dwi_ext = sct.extract_fname(
file_dwi)
# DWI groups
file_dwi_mean = []
for iGroup in tqdm(range(nb_groups),
unit='iter',
unit_scale=False,
desc="Merge within groups",
ascii=True,
ncols=80):
# get index
index_dwi_i = group_indexes[iGroup]
nb_dwi_i = len(index_dwi_i)
# Merge DW Images
file_dwi_merge_i = os.path.join(
file_dwi_dirname, file_dwi_basename + '_' + str(iGroup) + ext_data)
im_dwi_list = []
for it in range(nb_dwi_i):
im_dwi_list.append(im_data_split_list[index_dwi_i[it]])
im_dwi_out = concat_data(im_dwi_list, 3).save(file_dwi_merge_i)
# Average DW Images
file_dwi_mean_i = os.path.join(
file_dwi_dirname,
file_dwi_basename + '_mean_' + str(iGroup) + ext_data)
file_dwi_mean.append(file_dwi_mean_i)
sct.run([
"sct_maths", "-i", file_dwi_merge_i, "-o", file_dwi_mean[iGroup],
"-mean", "t"
], 0)
# Merge DWI groups means
sct.printv('\nMerging DW files...', param.verbose)
# file_dwi_groups_means_merge = 'dwi_averaged_groups'
im_dw_list = []
for iGroup in range(nb_groups):
im_dw_list.append(file_dwi_mean[iGroup])
im_dw_out = concat_data(im_dw_list, 3).save(file_dwi_group)
# Average DW Images
# TODO: USEFULL ???
sct.printv('\nAveraging all DW images...', param.verbose)
sct.run([
"sct_maths", "-i", file_dwi_group, "-o",
file_dwi_group + '_mean' + ext_data, "-mean", "t"
], param.verbose)
# segment dwi images using otsu algorithm
if param.otsu:
sct.printv('\nSegment group DWI using OTSU algorithm...',
param.verbose)
# import module
otsu = importlib.import_module('sct_otsu')
# get class from module
param_otsu = otsu.param() #getattr(otsu, param)
param_otsu.fname_data = file_dwi_group
param_otsu.threshold = param.otsu
param_otsu.file_suffix = '_seg'
# run otsu
otsu.otsu(param_otsu)
file_dwi_group = file_dwi_group + '_seg.nii'
# START MOCO
#===================================================================================================================
# Estimate moco on b0 groups
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Estimating motion on b=0 images...', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco = param
param_moco.file_data = 'b0.nii'
# identify target image
if index_dwi[0] != 0:
# If first DWI is not the first volume (most common), then there is a least one b=0 image before. In that case
# select it as the target image for registration of all b=0
param_moco.file_target = os.path.join(
file_data_dirname, file_data_basename + '_T' +
str(index_b0[index_dwi[0] - 1]).zfill(4) + ext_data)
else:
# If first DWI is the first volume, then the target b=0 is the first b=0 from the index_b0.
param_moco.file_target = os.path.join(
file_data_dirname,
file_data_basename + '_T' + str(index_b0[0]).zfill(4) + ext_data)
param_moco.path_out = ''
param_moco.todo = 'estimate'
param_moco.mat_moco = 'mat_b0groups'
file_mat_b0 = moco.moco(param_moco)
# Estimate moco on dwi groups
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Estimating motion on DW images...', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco.file_data = file_dwi_group
param_moco.file_target = file_dwi_mean[
0] # target is the first DW image (closest to the first b=0)
param_moco.path_out = ''
param_moco.todo = 'estimate_and_apply'
param_moco.mat_moco = 'mat_dwigroups'
file_mat_dwi = moco.moco(param_moco)
# create final mat folder
sct.create_folder(mat_final)
# Copy b=0 registration matrices
# TODO: use file_mat_b0 and file_mat_dwi instead of the hardcoding below
sct.printv('\nCopy b=0 registration matrices...', param.verbose)
for it in range(nb_b0):
sct.copy(
'mat_b0groups/' + 'mat.Z0000T' + str(it).zfill(4) + ext_mat,
mat_final + 'mat.Z0000T' + str(index_b0[it]).zfill(4) + ext_mat)
# Copy DWI registration matrices
sct.printv('\nCopy DWI registration matrices...', param.verbose)
for iGroup in range(nb_groups):
for dwi in range(
len(group_indexes[iGroup])
): # we cannot use enumerate because group_indexes has 2 dim.
sct.copy(
'mat_dwigroups/' + 'mat.Z0000T' + str(iGroup).zfill(4) +
ext_mat, mat_final + 'mat.Z0000T' +
str(group_indexes[iGroup][dwi]).zfill(4) + ext_mat)
# Spline Regularization along T
if param.spline_fitting:
moco.spline(mat_final, nt, nz, param.verbose, np.array(index_b0),
param.plot_graph)
# combine Eddy Matrices
if param.run_eddy:
param.mat_2_combine = 'mat_eddy'
param.mat_final = mat_final
moco.combine_matrix(param)
# Apply moco on all dmri data
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Apply moco', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco.file_data = file_data
param_moco.file_target = os.path.join(
file_dwi_dirname, file_dwi_basename + '_mean_' + str(0) +
ext_data) # reference for reslicing into proper coordinate system
param_moco.path_out = ''
param_moco.mat_moco = mat_final
param_moco.todo = 'apply'
moco.moco(param_moco)
# copy geometric information from header
# NB: this is required because WarpImageMultiTransform in 2D mode wrongly sets pixdim(3) to "1".
im_dmri = Image(file_data)
fname_data_moco = os.path.join(file_data_dirname,
file_data_basename + param.suffix + '.nii')
im_dmri_moco = Image(fname_data_moco)
im_dmri_moco.header = im_dmri.header
im_dmri_moco.save()
return os.path.abspath(fname_data_moco)
def dmri_moco(param):
file_data = 'dmri'
ext_data = '.nii'
file_b0 = 'b0'
file_dwi = 'dwi'
mat_final = 'mat_final/'
file_dwi_group = 'dwi_averaged_groups' # no extension
fsloutput = 'export FSLOUTPUTTYPE=NIFTI; ' # for faster processing, all outputs are in NIFTI
ext_mat = 'Warp.nii.gz' # warping field
# Get dimensions of data
sct.printv('\nGet dimensions of data...', param.verbose)
nx, ny, nz, nt, px, py, pz, pt = Image(file_data + '.nii').dim
sct.printv(' ' + str(nx) + ' x ' + str(ny) + ' x ' + str(nz),
param.verbose)
# Identify b=0 and DWI images
sct.printv('\nIdentify b=0 and DWI images...', param.verbose)
index_b0, index_dwi, nb_b0, nb_dwi = identify_b0('bvecs.txt',
param.fname_bvals,
param.bval_min,
param.verbose)
# check if dmri and bvecs are the same size
if not nb_b0 + nb_dwi == nt:
sct.printv(
'\nERROR in ' + os.path.basename(__file__) + ': Size of data (' +
str(nt) + ') and size of bvecs (' + str(nb_b0 + nb_dwi) +
') are not the same. Check your bvecs file.\n', 1, 'error')
sys.exit(2)
# Prepare NIFTI (mean/groups...)
#===================================================================================================================
# Split into T dimension
sct.printv('\nSplit along T dimension...', param.verbose)
status, output = sct.run(
'sct_split_data -i ' + file_data + ext_data + ' -dim t -suffix _T',
param.verbose)
# Merge b=0 images
sct.printv('\nMerge b=0...', param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_b0
# for it in range(nb_b0):
# cmd = cmd + ' ' + file_data + '_T' + str(index_b0[it]).zfill(4)
cmd = 'sct_concat_data -dim t -o ' + file_b0 + ext_data + ' -i '
for it in range(nb_b0):
cmd = cmd + file_data + '_T' + str(
index_b0[it]).zfill(4) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
status, output = sct.run(cmd, param.verbose)
sct.printv((' File created: ' + file_b0), param.verbose)
# Average b=0 images
sct.printv('\nAverage b=0...', param.verbose)
file_b0_mean = file_b0 + '_mean'
sct.run(
'sct_maths -i ' + file_b0 + '.nii' + ' -o ' + file_b0_mean + '.nii' +
' -mean t', param.verbose)
# if not average_data_across_dimension(file_b0+'.nii', file_b0_mean+'.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# cmd = fsloutput + 'fslmaths ' + file_b0 + ' -Tmean ' + file_b0_mean
# status, output = sct.run(cmd, param.verbose)
# Number of DWI groups
nb_groups = int(math.floor(nb_dwi / param.group_size))
# Generate groups indexes
group_indexes = []
for iGroup in range(nb_groups):
group_indexes.append(index_dwi[(iGroup *
param.group_size):((iGroup + 1) *
param.group_size)])
# add the remaining images to the last DWI group
nb_remaining = nb_dwi % param.group_size # number of remaining images
if nb_remaining > 0:
nb_groups += 1
group_indexes.append(index_dwi[len(index_dwi) -
nb_remaining:len(index_dwi)])
# DWI groups
for iGroup in range(nb_groups):
sct.printv('\nDWI group: ' + str((iGroup + 1)) + '/' + str(nb_groups),
param.verbose)
# get index
index_dwi_i = group_indexes[iGroup]
nb_dwi_i = len(index_dwi_i)
# Merge DW Images
sct.printv('Merge DW images...', param.verbose)
file_dwi_merge_i = file_dwi + '_' + str(iGroup)
cmd = 'sct_concat_data -dim t -o ' + file_dwi_merge_i + ext_data + ' -i '
for it in range(nb_dwi_i):
cmd = cmd + file_data + '_T' + str(
index_dwi_i[it]).zfill(4) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
sct.run(cmd, param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_dwi_merge_i
# for it in range(nb_dwi_i):
# cmd = cmd +' ' + file_data + '_T' + str(index_dwi_i[it]).zfill(4)
# Average DW Images
sct.printv('Average DW images...', param.verbose)
file_dwi_mean = file_dwi + '_mean_' + str(iGroup)
sct.run(
'sct_maths -i ' + file_dwi_merge_i + '.nii' + ' -o ' +
file_dwi_mean + '.nii' + ' -mean t', param.verbose)
# if not average_data_across_dimension(file_dwi_merge_i+'.nii', file_dwi_mean+'.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# cmd = fsloutput + 'fslmaths ' + file_dwi_merge_i + ' -Tmean ' + file_dwi_mean
# sct.run(cmd, param.verbose)
# Merge DWI groups means
sct.printv('\nMerging DW files...', param.verbose)
# file_dwi_groups_means_merge = 'dwi_averaged_groups'
cmd = 'sct_concat_data -dim t -o ' + file_dwi_group + ext_data + ' -i '
for iGroup in range(nb_groups):
cmd = cmd + file_dwi + '_mean_' + str(iGroup) + ext_data + ','
cmd = cmd[:-1] # remove ',' at the end of the string
sct.run(cmd, param.verbose)
# cmd = fsloutput + 'fslmerge -t ' + file_dwi_group
# for iGroup in range(nb_groups):
# cmd = cmd + ' ' + file_dwi + '_mean_' + str(iGroup)
# Average DW Images
# TODO: USEFULL ???
sct.printv('\nAveraging all DW images...', param.verbose)
fname_dwi_mean = 'dwi_mean'
sct.run(
'sct_maths -i ' + file_dwi_group + '.nii' + ' -o ' + file_dwi_group +
'_mean.nii' + ' -mean t', param.verbose)
# if not average_data_across_dimension(file_dwi_group+'.nii', file_dwi_group+'_mean.nii', 3):
# sct.printv('ERROR in average_data_across_dimension', 1, 'error')
# sct.run(fsloutput + 'fslmaths ' + file_dwi_group + ' -Tmean ' + file_dwi_group+'_mean', param.verbose)
# segment dwi images using otsu algorithm
if param.otsu:
sct.printv('\nSegment group DWI using OTSU algorithm...',
param.verbose)
# import module
otsu = importlib.import_module('sct_otsu')
# get class from module
param_otsu = otsu.param() #getattr(otsu, param)
param_otsu.fname_data = file_dwi_group + '.nii'
param_otsu.threshold = param.otsu
param_otsu.file_suffix = '_seg'
# run otsu
otsu.otsu(param_otsu)
file_dwi_group = file_dwi_group + '_seg'
# extract first DWI volume as target for registration
nii = Image(file_dwi_group + '.nii')
data_crop = nii.data[:, :, :, index_dwi[0]:index_dwi[0] + 1]
nii.data = data_crop
nii.setFileName('target_dwi.nii')
nii.save()
# START MOCO
#===================================================================================================================
# Estimate moco on b0 groups
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Estimating motion on b=0 images...', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco = param
param_moco.file_data = 'b0'
if index_dwi[0] != 0:
# If first DWI is not the first volume (most common), then there is a least one b=0 image before. In that case
# select it as the target image for registration of all b=0
param_moco.file_target = file_data + '_T' + str(
index_b0[index_dwi[0] - 1]).zfill(4)
else:
# If first DWI is the first volume, then the target b=0 is the first b=0 from the index_b0.
param_moco.file_target = file_data + '_T' + str(index_b0[0]).zfill(4)
param_moco.path_out = ''
param_moco.todo = 'estimate'
param_moco.mat_moco = 'mat_b0groups'
moco.moco(param_moco)
# Estimate moco on dwi groups
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Estimating motion on DW images...', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco.file_data = file_dwi_group
param_moco.file_target = 'target_dwi' # target is the first DW image (closest to the first b=0)
param_moco.path_out = ''
#param_moco.todo = 'estimate'
param_moco.todo = 'estimate_and_apply'
param_moco.mat_moco = 'mat_dwigroups'
moco.moco(param_moco)
# create final mat folder
sct.create_folder(mat_final)
# Copy b=0 registration matrices
sct.printv('\nCopy b=0 registration matrices...', param.verbose)
for it in range(nb_b0):
sct.run(
'cp ' + 'mat_b0groups/' + 'mat.T' + str(it) + ext_mat + ' ' +
mat_final + 'mat.T' + str(index_b0[it]) + ext_mat, param.verbose)
# Copy DWI registration matrices
sct.printv('\nCopy DWI registration matrices...', param.verbose)
for iGroup in range(nb_groups):
for dwi in range(len(group_indexes[iGroup])):
sct.run(
'cp ' + 'mat_dwigroups/' + 'mat.T' + str(iGroup) + ext_mat +
' ' + mat_final + 'mat.T' + str(group_indexes[iGroup][dwi]) +
ext_mat, param.verbose)
# Spline Regularization along T
if param.spline_fitting:
moco.spline(mat_final, nt, nz, param.verbose, np.array(index_b0),
param.plot_graph)
# combine Eddy Matrices
if param.run_eddy:
param.mat_2_combine = 'mat_eddy'
param.mat_final = mat_final
moco.combine_matrix(param)
# Apply moco on all dmri data
sct.printv(
'\n-------------------------------------------------------------------------------',
param.verbose)
sct.printv(' Apply moco', param.verbose)
sct.printv(
'-------------------------------------------------------------------------------',
param.verbose)
param_moco.file_data = 'dmri'
param_moco.file_target = file_dwi + '_mean_' + str(
0) # reference for reslicing into proper coordinate system
param_moco.path_out = ''
param_moco.mat_moco = mat_final
param_moco.todo = 'apply'
moco.moco(param_moco)
# copy geometric information from header
# NB: this is required because WarpImageMultiTransform in 2D mode wrongly sets pixdim(3) to "1".
copy_header('dmri.nii', 'dmri_moco.nii')
# generate b0_moco_mean and dwi_moco_mean
cmd = 'sct_dmri_separate_b0_and_dwi -i dmri' + param.suffix + '.nii -b bvecs.txt -a 1'
if not param.fname_bvals == '':
cmd = cmd + ' -m ' + param.fname_bvals
sct.run(cmd, param.verbose)