I don’t think we ever write out the mid-sagittal plane, but we do compute it when we segment the callosum. You could set the lateral distance to extend the callosum to 0 with -t 0 and then it will only label cc voxels in the mid-sagittal plane

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Sam W
Sent: Friday, August 26, 2022 8:37 PM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] midsagittal mask

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Hello!

I ran recon-all on my subject, is it possible to create a mask of the midsagittal plane using freesurfer?

Best regards,

Sam