The ‘data_brain_mask.nii.gz’ dataset defines the mask used in the diffusion MRI analysis for ‘data.nii.gz’.
The file ‘data_brain_mask.nii.gz’ is in gzipped NIfTI format. The R-package oro.nifti is required to read NIfTI files. This file may be obtained from ‘data.nii.gz’ by applying FSL/BET pre-processing tools.
For reasons of limited CRAN storage space, a trimmed down data set with just 4 coronal slices was selected. Coronal slices (29:32) were extracted from the original data set.
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).
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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.