Hi FreeSurfer, I have two images. One MPRAGE (1x1x1mm) and a T1-weighted (0.682x0.682x3mm) image used for CBV mapping. We have run FS, with hippocampal subfields on the MPRAGE and would now like to transform the posterior probability maps to the T1-weighted CBV space.
I have been using 1) mri_vol2vol with --regheader to map the posterior_* subfield files to nu.mgz space 2) mri_robust_register to coregister the nu.mgz file to the T1-weighted CBV image
Is there any way to combine the .reg and .lta files from (1) and (2) to transform the subfield posterior probability maps directly from their 0.5mm^3 space to the T1-weighted CBV space? I have been reluctant to create an intermediate volume between steps 1 and 2, as resampling the subfield probability maps into 1x1x1mm nu.mgz space will result in loss of resolution to the 0.68x0.68 (coronal) space in the T1-weighted CBV scan.
Any help would be appreciated
Usman