The former!

--

Juan Eugenio Iglesias

http://www.jeiglesias.com

From: Marco Ganzetti <marco.ganzetti@biogen.com>
Date: Monday, June 30, 2025 at 05:57
To: freesurfer@nmr.mgh.harvard.edu <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] eTIV in SynthSeg

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Dear,

I would like to know how the eTIV is estimated in SynthSeg and SynthSeg+ .

Is it a combination of CSF+ventricles+WM+GM masks?

Or do you estimate is using the registration to MNI space approach?

Best,

Marco