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Revert to read bval from PVM_DwEffBval and bvec from PVM_DwGradVec #96

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Nov 16, 2022
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Revert to read bval from PVM_DwEffBval and bvec from PVM_DwGradVec #96

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18 changes: 3 additions & 15 deletions brkraw/lib/loader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -823,21 +823,9 @@ def _get_temp_info(self, visu_pars):
# DTI
@staticmethod
def _get_bdata(method):
# [220201] parse the input value directly instead of final values & remove bmat
bval = get_value(method, 'PVM_DwBvalEach')
bval = [bval] if isinstance(bval, int) else bval
num_b0 = get_value(method, 'PVM_DwAoImages')
num_exp = get_value(method, 'PVM_DwNDiffExp')
num_dir = int((num_exp - num_b0) / len(bval))
bdir = get_value(method, 'PVM_DwDir')
bvals = np.r_[np.zeros(num_b0), np.concatenate([bval for i in np.ones(num_dir).astype(int)], axis=0)]
bvecs = np.concatenate([np.zeros([num_b0, 3])] + [bdir] * len(bval), axis=0).T
# test if results are correctly built
try:
assert(bvals.shape[0] == num_exp)
assert(bvecs.shape[-1] == num_exp)
except:
raise UnexpectedError('Exceptional case is reported, please report on issue at brkraw github')
"""Extract, format, and return diffusion bval and bvec"""
bvals = np.array(get_value(method, 'PVM_DwEffBval'))
bvecs = np.array(get_value(method, 'PVM_DwGradVec').T)
return bvals, bvecs

# Generals
Expand Down