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You can try something like
mri_volsynth --dim 1 1 1 1 --vox-size size size size --p0 x y z --pdf const --o voxel.mgz
where size is the size of the MRS voxel
x y z are the center of the voxel in scanner space
Load voxel.mgz onto the anatomical to make sure it is in the right place

On 8/22/2023 11:28 AM, Lauren Stephens wrote:

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Dear FreeSurfer,

I am trying to extract tissue composition of %GM, %WM, and %CSF from a Freesurfer processed brain. I have the coordinates for the voxel but do not know how to place a voxel on the brain in FreeSurfer before running mri_compute_volume_fractions. Can anyone provide direction on how to do this in FreeSurfer using a Mac running Ventura 13.4.1?

Thank you,

Lauren Stephens

Lauren Stephens, MS

Assistant Clinical Research Coordinator

Department of Psychiatry and Behavioral Science

Stanford University School of Medicine

E: laurenss@stanford.edu

P: (650)-725-1716
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