Re: [Freesurfer] average measure of cortical thickness

Is the last item in the list "lh_MeanThickness_thickness" This is the mean thickness across the hemisphere. doug

On 10/31/2012 05:16 AM, Daniel Ferreira wrote:

Hi Douglas,

Well, I usually use aparcstats2table with -m thickness, but what I get is the thickness for all those 34 hemisphere regions, but not that measure of mean thickness for the hemisphere. Could I be missing something?

thanks Daniel

Message: 15 Date: Tue, 30 Oct 2012 11:17:56 -0400 From: Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> Subject: Re: [Freesurfer] average measure of cortical thickness To: freesurfer@nmr.mgh.harvard.edu mailto:freesurfer@nmr.mgh.harvard.edu Message-ID: <508FEFA4.9070105@nmr.mgh.harvard.edu mailto:508FEFA4.9070105@nmr.mgh.harvard.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed

You can get thickness with aparcastats2table with the -m thickness option. This gives you a measure of mean thickness for the hemisphere as well. do8ug

2012/10/30 Daniel Ferreira <danifer@ull.es mailto:danifer@ull.es>

Please, is there any automatic way to extract this "Mean
Thickness" values for lh and rh for a big group of subjects? As
for example aparcstats2table?

thank you very much

Daniel


2012/10/30 Bruce Fischl <fischl@nmr.mgh.harvard.edu
<mailto:fischl@nmr.mgh.harvard.edu>>

    yes, I think so

    Bruce
    On Tue, 30 Oct 2012, Daniel Ferreira wrote:

        So, as a measure of whole brain cortical thickness average
        is it better to
        "Mean Thickness" from aparc.stats file?


        2012/10/30 Bruce Fischl <fischl@nmr.mgh.harvard.edu
        <mailto:fischl@nmr.mgh.harvard.edu>>
              Hi Daniel

              the parcellations are not uniform in size, and
        therefore the
              average of them will not be the same as averaging
        over the
              cortex.

              cheers
              Bruce
              On Tue, 30 Oct 2012, Daniel Ferreira wrote:

                    Hi,
                    I was wondering what should I use as an average of
                    cortical thickness for
                    the whole cortex.

                    The aparc.stats output gives a value of "Mean
                    Thickness" for each
                    hemisphere. But this value does not coincide with
                    the one I get if I average
                    the 34 variables from aparc.stats. Do you know
        why?

                    thanks so much in advance

                    Daniel




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