Defined in file : brainvisa/toolboxes/nuclearimaging/types/PetSubjectTypes_T1.py
compute brain mask
BrainVISA volume formats
NIFTI-1 image
{center}/{subject}/t1mri/{acquisition}/{analysis}/segmentation/<subject>_Nat_CSF_Mask_{method}
rescan , acquisition_date , time_point , time_duration , center , subject , acquisition , analysis , method