Hello,

Are the values you want not in the aseg.stats file? You can do it from individual ROIs, but you have to  use all of them, not just the ones you list

Thanks for getting back to me. The aseg file only has volume information and not anything about surface area or thickness. We found a measure that we think is global surface area (split by hemisphere) in the aparc files, however, we are not sure how this value is calculated. Additionally, we see no output of a global thickness measurement in any of the files and we are curious about how we can go about generating a global surface area and global thickness. Please let us know if you have any recommendations.

Thanks in advance.

Micah

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Douglas N. Greve <dgreve@mgh.harvard.edu>
Sent: Thursday, August 20, 2020 9:41:54 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Generating Global Thickness and Surface Area Estiamtes from .aparc variables

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Are the values you want not in the aseg.stats file? You can do it from individual ROIs, but you have to  use all of them, not just the ones you list

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Dear Freesurfer Experts,

I want to generate global measures of cortical thickness and pial surface area analogous to using total cerebral volume as a global brain volume estimate.

In your opinion, would it be reasonable to generate these global thickness and surface area estimates from the following .aparc variables:

SurfArea.lh.Frontal

MeanThick.lh.Frontal

SurfArea.rh.Frontal

MeanThick.rh.Frontal

SurfArea.lh.Occipital

MeanThick.lh.Occipital

SurfArea.rh.Occipital

MeanThick.rh.Occipital

SurfArea.lh.Parietal

MeanThick.lh.Parietal

SurfArea.rh.Parietal

MeanThick.rh.Parietal

SurfArea.lh.Temporal

MeanThick.lh.Temporal

SurfArea.rh.Temporal

MeanThick.rh.Temporal

Regards,

Micah

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