The coordinates reported in .label are in Freesurfer tkregister RAS space. You
can use mri_label2label to map them to MNI 305 space
https://surfer.nmr.mgh.harvard.edu/fswiki/mri_label2label
Yujing
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Yang Yifan
Sent: Wednesday, February 5, 2025 8:03 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] FreeSurfer coordinates
External Email - Use Caution
Hi FreeSurfer Developers,
I'm conducting manual ROI labelling on each participant's inflated surface
(after going through the 'recon-all' command), but I wasn't very sure if the
coordinates in the corresponding .label files are in MNI 305 space. At the top
of the plain text files it's showing 'vox2ras=TkReg'.
If they are not in MNI 305, could you please explain a bit about what
coordinate system is used here and how I could convert that into MNI 305?
Thank you very much!
Best wishes,
Vivian
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