¥ AFNI formatted
datasets are stored in 2 files
H The .HEAD file
holds all the auxiliary information
H The .BRIK file
holds all the numbers in all the sub-bricks
¥ Datasets can be in one of 3 coordinate systems (AKA views)
H Original data or +orig
view: from the scanner
H AC-PC aligned or +acpc
view:
o Dataset
rotated/shifted so that the anterior commissure and posterior
commissure are horizontal (y-axis), the AC is at (x,y,z)=(0,0,0),
and the hemispheric fissure is vertical (z-axis)
H Talairach or +tlrc
view:
o Dataset has
also been rescaled to conform to the Talairach-Tournoux atlas dimensions (R-L=136 mm; A-P=172 mm; I-S=116 mm)
o AKA Talairach or Stererotaxic
coordinates
o Not quite
the same as MNI coordinates, but very close