Dear FreeSurfer experts,

I have 2 questions:

1- I try to measure average convexity for temporal lobe by FreeSurfer, I can see the values for each vertex when I overlay the e.g. lh.sulc in lh.inflated, but I wonder if I can find these values somewhere else like in stats files?

2- Is FreeSurfer compute metric distortion for a specific ROI (e.g. ROIs segmented in parcellation ) according following equation? and if that's the case where can I find these values of metric distortion?

Metric distortion = k ∗ area of a triangle on registered sphere/

area of triangle on original gray/white interface surface

Where k = total surface area of original gray/white interface surface/

total surface area of individual sphere

could you help me to solve the problem, I am looking forward to receive your answer. Thank you for your help.

Best Regards,

Nazanin