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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

KKI SECURITY ALERT: This email is from an external source. Do not click on any links or open attachments unless you recognize the sender and know the content is safe. ________________________________ 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

On 8/19/2020 11:27 AM, Plotkin, Micah wrote:

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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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