Dear Freesurfer expert,
I am writing regarding the local gyrification index (lGI), pipeline now available with Freesurfer.
In order to better understand the results obtained it would be important to better understand the relationship between lGI to other metrics provided by the freesurfer analysis.
I understand lGI is the ratio between the sulcal surface / outer surface.
Which is the relationship between lGI and area, area_pial, sulcation and curvature and even thickness (available for the qdec analysis)? Has it been evaluated yet?
Edu
________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Douglas N Greve greve@nmr.mgh.harvard.edu Sent: Thursday, September 7, 2017 3:17 PM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Unknown regions in cortical parcellation
what version of FS are you using?
On 09/07/2017 03:19 PM, Aidan Murphy wrote:
We're running QA on Freesurfer's aseg and aparc+aseg volumes. On the aparc volume we're noticing fairly large unknown regions in what should be entorhinal cortex, specifically where it comes up against the hippocampus and amygdala. The aseg volumes label these unknown regions as cortex. I've searched the archives and haven't been able to find anything similar from recent years.
I've attached some axial screenshots of the raw T1, the aseg and the aparc+aseg.
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