You can try

mri_compute_volume_fractions

USAGE: mri_compute_volume_fractions

   --o   outstem : output will be outstem.{cortex,subcort_gm,wm,csf}.mgz

   --reg regfile : can be LTA or reg.dat (if reg.dat, then need template volume)

   --regheader subject

.

.

.

Which should output a multi-frame MGH file where each frame is the volume fraction of (in order) cortical gm, subcortical gm, white matter, and csf.

Cheers

Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of ERNEST KISSI
Sent: Sunday, February 11, 2024 7:44 AM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Tissue Segmentation

        External Email - Use Caution        

Hello freesurfer team,

Please does Freesurfer have a function or a code for tissue Segmentation just like in FSL that you can do tissue based segmentations into GM, WM and CSF and also their partial volume segmentations? 

Thank you.