Thanks for your response Bruce. Does FS calculate the distance between the surface and CSF border in Euclidean and then converts it into mm?

Thanks Mona

On Jul 6, 2020, at 12:40 PM, Fischl, Bruce BFISCHL@mgh.harvard.edu wrote:

yes

-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Nasiriavanaki, Zahra Sent: Monday, July 6, 2020 12:31 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] cortical thickness

Hi Freesurfer experts

I have a question about the way FS calculates cortical thickness and I appreciate if you could please respond. I calculated the cortical thickness using read_curv script in a specific ROI in parietal lobe. The mean thickness at that area was 2.4. Does this number show the cortical thickness in millimeter?

Thanks MOna _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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I got my answer. Thanks so much

On Jul 6, 2020, at 1:31 PM, Fischl, Bruce BFISCHL@mgh.harvard.edu wrote:

I'm not sure I understand your question. We compute the distance between minimum distances between the white and pial in mm, then compute the minimum between the pial and the white, then average them (all in mm)

-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Nasiriavanaki, Zahra Sent: Monday, July 6, 2020 1:00 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] cortical thickness

Thanks for your response Bruce. Does FS calculate the distance between the surface and CSF border in Euclidean and then converts it into mm?

Thanks Mona

...

On Jul 6, 2020, at 12:40 PM, Fischl, Bruce BFISCHL@mgh.harvard.edu wrote:

yes

-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Nasiriavanaki, Zahra Sent: Monday, July 6, 2020 12:31 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] cortical thickness

Hi Freesurfer experts

I have a question about the way FS calculates cortical thickness and I appreciate if you could please respond. I calculated the cortical thickness using read_curv script in a specific ROI in parietal lobe. The mean thickness at that area was 2.4. Does this number show the cortical thickness in millimeter?

Thanks MOna _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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