I have a whole slew of binary ROIs in MNI152 space @ 1mm resolution (182x218x182 voxels). Is there straightforward AFNI incantation to warp these from MNI152 space to match TT_icbm452+tlrc @ 4mm isotropic?
Usually I do this the other way around (TT->MNI) and use fsl to do the job. Now needing to go the opposite way I’ve realized I’ve no idea how to do this in AFNI
Any help much appreciated.
There are a few ways to transform to Talairach space from MNI space.
for N27 in MNI (MNI_N27) space data, this works best
adwarp -prefix tt_testmni_region -resam NN -apar TT_N27+tlrc -dpar testmni_regions+tlrc. -force
Use the two-part Brett transform for the ICBM452 or MNI-152 datasets, this probably works better
3dWarp -mni2tta -NN -prefix tt_testmni_region_brett+tlrc testmni_regions+tlrc.
color in AFNI with separate colors per region
3drefit -cmap INT_CMAP testmni_regions+tlrc.
3drefit -cmap INT_CMAP tt_testmni_region*+tlrc*.HEAD
You could also use the Lancaster transformations too. See this previous post for some gory details. Check your results in the afni GUI.
Thanks Daniel. I had completely forgotten about the 3dWarp option.