[Freesurfer] apply an existing linear transform to a GRE phase map

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Hello FreeSurfer Developers,

I hope you are well. I'm attempting to apply an .lta file generated by mri_robust register. The files I want to apply the transform on are GRE phase maps, so I don't want to do any resampling.

I was looking around mri_vol2vol, but all the examples seem to involve resampling to a target scan. How would I go about this if I simple want to apply this linear transform on the phase maps (nii) in freesurfer?

1. Freesurfer version 7.3.0 2. Platform: CentOS Version 7

Sincerely,

Daniel Balentine

Data Analyst Athinoula A Martinos Center for Biomedical Imaging Massachusetts General Hospital 149 - 13th Street Charlestown, MA 02129 dbalentine@mgh.harvard.edu