Hi Kelli,
the official talairach xform is in mri/transforms/talairach.xfm and it uses the MNI tools to transform into the MNI space. The talairach.lta is something that is used as part of the subcortical segmentation, and we believe could work as a tal xform, but we don't use it as such as it hasn't been validated to be a true talairach space. We may do some internal verification one of these days and use it instead, but not yet.
cheers, Bruce
On Wed, 27 Dec 2006, Dominick, Kelli, Ray Carpenter wrote:
Hi All, We have had a number of brains with very bad talairach transforms however aparc+aseg looks fine. In addition, while the talairach.xfm transform is very bad talairach.Ita is not. Is the bad xfm transform still a problem even though it is not affecting the labels. And if so which transform should I attempt to correct in tkregister2 in order to fix the problem? (I ask because it looks like that some of the tutorials still refer to old file names that have changed in the stable versions). I am using v3.03. Thanks in advance for your help! Kelli