¥ Besides the voxel values, a dataset also
contains auxiliary information, including (some of which is
optional):
H xyz dimensions of each voxel (in
mm)
H Orientation of dataset axes;
²for example,
x-axis=R-L, y-axis=A-P, z-axis=I-S
²Þ axial slices
H Location of dataset in scanner
coordinates
² Needed to overlay one dataset onto
another
H Time between sub-bricks, for 3D+time datasets
² Such datasets are the basic unit of FMRI
data (one per imaging run)
H Statistical parameters associated with
each sub-brick
² e.g., a t-statistic has the
degrees-of-freedom parameter stored