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Dataset Contents: Header
¥ 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;
for example, x-axis=R-L, y-axis=A-P, z-axis=I-S
Þ axial slices
H Location of dataset in scanner coordinates
o Needed to
overlay one dataset onto another
H Time between sub-bricks, for 3D+time
datasets
o Such
datasets are the basic unit of FMRI data (one per imaging run)
H Statistical parameters associated with each sub-brick
o e.g., a t-statistic
has the degrees-of-freedom parameter stored
o e.g., an F-statistic
has 2 DOF parameters stored
