¥ 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