Here is an explanation of etiv calculation in Freesurfer -
https://surfer.nmr.mgh.harvard.edu/fswiki/recon-all
etiv is not obtained via direct segmentation of all structures within the skull
boundaries. Rather, its estimation depends on the linear transform between the
T1 image and a T1w atlas.
Best,
Yujing
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Carlos Alcocer
Sent: Friday, January 5, 2024 4:11 PM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] poor inferior cerebellum segmentation
External Email - Use Caution
Hello,
Inferior portion of cerebellum are not segmented well. It is included in
skullstrip and I tried adding control points in cerebellar WM but this did not
help. I am not interested in cerebellum but I do need eTIV. Will this poor
cerebellar segmentation affect eTIV calculation?
Thank you,
Carlos
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