The mask used here is an all-brain mask; it just removes non-brain regions, as the result of applying a brain extraction tool to the data.nii.gz dataset. However, other masks may be defined to select regions of interest (ROIs).
Jenkinson, M., Beckmann, C. F., Behrens, T. E., Woolrich, M. W., and Smith, S. M. Fsl. NeuroImage 62, 2 (2012), 782-790.
NITRC repository, http://www.nitrc.org.
data
,
data.bval
,
data.bvec
,
data_V1
,
data_V2
,
data_gfa
,
btable