-1-
Transforming Datasets to Talairach-Tournoux Coordinates
¥The original purpose of AFNI
was to perform the transformation of datasets to Talairach-Tournoux
(stereotaxic) coordinates
¥The transformation is
user-controlled, not automatic (yet)
¥You must mark various
anatomical locations, defined in
Jean Talairach and Pierre
TournouxÒCo-Planar
Stereotaxic Atlas of the Human BrainÓThieme
Medical Publishers, New York, 1988¥Marking is best done on a
high-resolution T1-weighted structural MRI volume
¥The transformation defined by
the manually placed markers then carries over to all other datasets in
the same directory
²This is where the
importance of getting the relative spatial placement of datasets done correctly in
to3d really matters
²You can then write
functional datasets to disk in Talairach coordinates
åPurpose: voxel-wise
comparison with other subjects
åMay want to blur
functional maps a little before comparisons, to allow for residual anatomic
variability: AFNI program 3dmerge