def across_sph_cc(vol_b_list,
bvals,
bvecs,
mask,
cod_single_mod=None,
cod_multi_mod=None,
single_thresh=None,
multi_thresh=None,
idx=None,
vol_mp_single=None,
tol=0.1,
n=20):
"""
Calculates the spherical cross correlation at a certain index for all b values fit
together and b values fit separately.
Parameters
----------
vol_b_list: list
List of the model parameters for each voxel for an fODF fit to each b value.
bvals: 1 dimensional array
All b values
bvecs: 2 dimensional array
All the b vectors
mask: 3 dimensional array
Brain mask of the data
cod_single_mod: 1 dimensional array
Coefficient of determination at each voxel for the single fODF model
cod_multi_mod: 1 dimensional array
Coefficient of determination at each voxel for the multi fODF model
single_thresh: int
Coefficient of determination threshold for the single fODF model
multi_thresh: int
Coefficient of determination threshold for the multi fODF model
idx: int
Index into the indices indicating the voxels included in the COD (in)equality
vol_mp_single: 2 dimensional array
Model parameters from fitting a single fODF to each voxel
tol: float
Tolerance for the COD (in)equality
n: int
Integer indicating the number of directions to divide by for spherical
cross-correlation
Returns
-------
deg_list: list
List indicating the degrees included in spherical cross-correlation
cc_list: list
List with the cross-correlations between each combination of b values
idx: int
Index into the indices indicating the voxels included in the COD (in)equality
cod_s: float
Coefficient of determination of single fODF model
cod_m: float
Coefficient of determination of multi fODF model
"""
if (single_thresh != None) & (multi_thresh != None):
# Get the indices with a desired COD.
inds, b_inds, all_b_inds = sph_cc_ineq(cod_single_mod,
cod_multi_mod,
bvals,
single_thresh,
multi_thresh,
tol=tol)
else:
# With no COD threshold, just find all the indices.
inds = np.arange(int(np.sum(mask)))
bval_list, b_inds, unique_b, rounded_bvals = ozu.separate_bvals(bvals)
all_b_inds = np.where(rounded_bvals != 0)
if idx is None:
# If a specific index is not given, just find a random index.
if ri is None:
ri = np.random.randint(0, len(inds))
else:
ri = ri
idx = inds[ri]
data_list = []
bvecs_b_list = []
deg_list = []
cc_list = []
pool = np.arange(len(vol_b_list))
for ii in pool:
# Just get the data (model parameters) and bvecs within the chosen voxel (idx)
# for each b value and mirror them.
data_list.append(
np.concatenate((vol_b_list[ii][np.where(mask)][idx],
vol_b_list[ii][np.where(mask)][idx]), -1))
bvecs_b_list.append(
np.squeeze(
np.concatenate(
(bvecs[:, b_inds[ii + 1]], -1 * bvecs[:, b_inds[ii + 1]]),
-1)).T)
if vol_mp_single is None:
# Make combinations of b values for spherical cross correlation between b values
combos = list(itertools.combinations(pool, 2))
this_iter = np.arange(len(combos))
else:
# No need for combos since comparing between the the single fODF and the multi fODF
combos = None
this_iter = np.arange(len(vol_b_list))
bvecs_all = np.squeeze(
np.concatenate((bvecs[:, all_b_inds], -1 * bvecs[:, all_b_inds]),
-1)).T
data_all = np.concatenate((vol_mp_single[np.where(mask)][idx],
vol_mp_single[np.where(mask)][idx]), -1)
for itr in this_iter:
if vol_mp_single is None:
# Inputs are data and bvecs from two different b values that you want to find the
# spherical cross-correlation between
inputs = [
np.squeeze(data_list[combos[itr][0]]),
np.squeeze(data_list[combos[itr][1]]),
bvecs_b_list[combos[itr][0]], bvecs_b_list[combos[itr][1]]
]
else:
# Inputs are the data and bvecs from one b value and the single fODF
inputs = [
np.squeeze(data_all),
np.squeeze(data_list[itr]), bvecs_all, bvecs_b_list[itr]
]
# Put the inputs into the spherical cross-correlation function
deg, cc = ozu.sph_cc(*inputs, n=n)
deg_list.append(deg)
cc_list.append(cc)
if (single_thresh != None) & (multi_thresh != None):
# Because sometimes it's nice to know what the actual CODs are
cod_s = cod_single_mod[idx]
cod_m = cod_multi_mod[idx]
else:
cod_s = None
cod_m = None
return deg_list, cc_list, combos, idx, cod_s, cod_m
def across_sph_cc(vol_b_list, bvals, bvecs, mask, cod_single_mod = None, cod_multi_mod = None,
single_thresh = None, multi_thresh = None, idx = None, vol_mp_single = None,
tol = 0.1, n = 20):
"""
Calculates the spherical cross correlation at a certain index for all b values fit
together and b values fit separately.
Parameters
----------
vol_b_list: list
List of the model parameters for each voxel for an fODF fit to each b value.
bvals: 1 dimensional array
All b values
bvecs: 2 dimensional array
All the b vectors
mask: 3 dimensional array
Brain mask of the data
cod_single_mod: 1 dimensional array
Coefficient of determination at each voxel for the single fODF model
cod_multi_mod: 1 dimensional array
Coefficient of determination at each voxel for the multi fODF model
single_thresh: int
Coefficient of determination threshold for the single fODF model
multi_thresh: int
Coefficient of determination threshold for the multi fODF model
idx: int
Index into the indices indicating the voxels included in the COD (in)equality
vol_mp_single: 2 dimensional array
Model parameters from fitting a single fODF to each voxel
tol: float
Tolerance for the COD (in)equality
n: int
Integer indicating the number of directions to divide by for spherical
cross-correlation
Returns
-------
deg_list: list
List indicating the degrees included in spherical cross-correlation
cc_list: list
List with the cross-correlations between each combination of b values
idx: int
Index into the indices indicating the voxels included in the COD (in)equality
cod_s: float
Coefficient of determination of single fODF model
cod_m: float
Coefficient of determination of multi fODF model
"""
if (single_thresh != None) & (multi_thresh != None):
# Get the indices with a desired COD.
inds, b_inds, all_b_inds = sph_cc_ineq(cod_single_mod, cod_multi_mod, bvals,
single_thresh, multi_thresh, tol = tol)
else:
# With no COD threshold, just find all the indices.
inds = np.arange(int(np.sum(mask)))
bval_list, b_inds, unique_b, rounded_bvals = ozu.separate_bvals(bvals)
all_b_inds = np.where(rounded_bvals != 0)
if idx is None:
# If a specific index is not given, just find a random index.
if ri is None:
ri = np.random.randint(0, len(inds))
else:
ri = ri
idx = inds[ri]
data_list = []
bvecs_b_list = []
deg_list = []
cc_list = []
pool = np.arange(len(vol_b_list))
for ii in pool:
# Just get the data (model parameters) and bvecs within the chosen voxel (idx)
# for each b value and mirror them.
data_list.append(np.concatenate((vol_b_list[ii][np.where(mask)][idx],
vol_b_list[ii][np.where(mask)][idx]), -1))
bvecs_b_list.append(np.squeeze(np.concatenate((bvecs[:, b_inds[ii+1]],
-1*bvecs[:, b_inds[ii+1]]), -1)).T)
if vol_mp_single is None:
# Make combinations of b values for spherical cross correlation between b values
combos = list(itertools.combinations(pool, 2))
this_iter = np.arange(len(combos))
else:
# No need for combos since comparing between the the single fODF and the multi fODF
combos = None
this_iter = np.arange(len(vol_b_list))
bvecs_all = np.squeeze(np.concatenate((bvecs[:, all_b_inds],
-1*bvecs[:, all_b_inds]), -1)).T
data_all = np.concatenate((vol_mp_single[np.where(mask)][idx],
vol_mp_single[np.where(mask)][idx]), -1)
for itr in this_iter:
if vol_mp_single is None:
# Inputs are data and bvecs from two different b values that you want to find the
# spherical cross-correlation between
inputs = [np.squeeze(data_list[combos[itr][0]]), np.squeeze(data_list[combos[itr][1]]),
bvecs_b_list[combos[itr][0]], bvecs_b_list[combos[itr][1]]]
else:
# Inputs are the data and bvecs from one b value and the single fODF
inputs = [np.squeeze(data_all), np.squeeze(data_list[itr]), bvecs_all, bvecs_b_list[itr]]
# Put the inputs into the spherical cross-correlation function
deg, cc = ozu.sph_cc(*inputs, n = n)
deg_list.append(deg)
cc_list.append(cc)
if (single_thresh != None) & (multi_thresh != None):
# Because sometimes it's nice to know what the actual CODs are
cod_s = cod_single_mod[idx]
cod_m = cod_multi_mod[idx]
else:
cod_s = None
cod_m = None
return deg_list, cc_list, combos, idx, cod_s, cod_m
