I usually just divide the volume by the eTIV (you can do this in asegstats2table with the --etiv flag). Some people will use it as a nuisance regressor in the GLM

On 7/27/2022 3:11 PM, Bouchra Guelib wrote:

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---------- Forwarded message ---------
De : Bouchra Guelib <bouchra.guelib@univ-constantine2.dz>
Date: mer. 27 juil. 2022 à 19:28
Subject: eTIV
To: <freesurfer-owner@nmr.mgh.harvard.edu>

I hope you can help me with this  point 
I extracted the measures in 'aseg.stats', 'lh.aparc.stats',and 'rh.aparc.stats'. Now I want to use these measures as input data for my model. However, I read that we need to normalize this data using eTIV. Can you tell me how? 

--

GUELIB Bouchra: Ph.D. student 

Lire Laboratory

University: Constantine 2-Abdelhamid Mehri- Algeria 

Alternative email: Guelibbouchra@gmail.com 

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