Re: [Freesurfer] Abormally high foldind index

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Hi Bruce,

I looked at the pial surfaces and WM by running this for the outlier subjects:

freeview -v subject1/mri/T1.mgz \ subject1/mri/brainmask.mgz \ -f subject1/surf/lh.white:edgecolor=yellow \ subject1/surf/lh.pial:edgecolor=red \ subject1/surf/rh.white:edgecolor=yellow \ subject1/surf/rh.pial:edgecolor=red

Nothing stood out to me. Is there anything else you suggest I investigate? What could explain a negative folding index?

Best, Ellen

On 3/31/2021 12:18 AM, Fischl, Bruce wrote:

Hi Ellen

It is certainly possible. Have you looked at the surfaces for those subjects?

Cheers Bruce

-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Ellen Ji Sent: Tuesday, March 30, 2021 5:44 PM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Abormally high foldind index

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Dear Experts,

While the majority of our subjects have a folding index between 5-30, there are a couple of *extreme* outliers in the thousands or even negative.

Could this hint that a particular part of recon-all failed and should be rerun?

Thank you for your interpretation and advice!

-Ellen

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