Hi Ela - When you overlay the aparc+aseg from 6.0 and the one from 7.2, is there a notable difference? Is there any chance that the brain is cut off? The error happened in the anterior commissure, that's a tract that does goes fairly close to the ventral surface of the brain, and in the part of the log file where the error happens I see some strange negative coordinates in the z direction.

Anastasia.
From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Salar Dini, Elaheh <elaheh.salardini@yale.edu>
Sent: Tuesday, January 18, 2022 4:55 PM
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] TRACULA Question
 

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Dear Anastasia,
I have run trac -all -prep in 2 different conditions:
a) prerequisite recon-all step was done using freesurfer 7.2.0
b) prerequisite recon-all step was done using freesurfer 6

The first time everything ran smoothly without an error, but when we used aparc+aseg resulted from running recon -all using version 6 of freesurfer, we got the following error for which I also attach the log file to this message: Segmentation fault (core dumped)

My question is that if I'm correct to assume that we can't run trac-all -prep using structural MRI segmentation done by previous versions of freesurfer? The reason I'm asking this is that I have a data from 100 subjects with Alzheimer's Disease. We have been collecting this data over the past 4 years and have done the recon -all step using freesurfer 6 for all of them as we acquired them. If trac-all can't use those segmentation, we have to do this step again for all these 100 subjects. 

I appreciate your help and insight.
Ela