Dear FreeSurfer experts

I am working on the gyrification index of schizophrenia patients. I had collated global brain values such as thickness, GM, and WM volumes.

In addition, I wanted to tabulate gyrification values. Using the below link I was able to extract the hemispheric mean gyrification values.

https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg31829.html

But it is giving me 2 rows of output that are adding more ambiguity to the existing problem.

Below is the command which I used to get mean gyrification for the left hemisphere and also the corresponding output.

Command Line:

mri_segstats --slabel CSRI104 lh /usr/local/freesurfer//subjects/CSRI104/label/lh.cortex --i /usr/local/freesurfer//subjects/CSRI104/surf/lh.pial_lgi --sum lh.aparc.pial_lgi.stats

Output:

# NRows 2
# NTableCols 10
# ColHeaders Index SegId NVertices Area_mm2 StructName Mean StdDev Min Max Range
1 0 6879 4687.8 Seg0000 2.4509 0.2838 1.8067 2.8873 1.0806
2 1 128054 84259.7 Seg0001 3.0148 0.6366 1.9369 4.7611 2.8242

My confusion is that which row I should take it as a mean gyrification value for the left hemisphere (seg0000 or seg0001)?

Please guide me if there is a way to combine two hemispheric values and make it as mean gyrification alike mean thickness.

With regards

Korann

On Wed, Sep 9, 2020 at 4:51 PM vittal korann <vittalkorann@gmail.com> wrote:

FreeSurfer experts

I am trying to extract the mean gyrification values for the whole brain alike cortical thickness.
We have all the whole-brain parameters in 'aparc.stats' file. But we do not have one for the gyrification index. Is there a way to do it?

Would be grateful for your help.

Best
Korann