[Freesurfer] white and pial surfaces appearing outside gray matter boundary

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Dear FreeSurfer experts,

I'm seeing this type of error reoccur for around half of the subjects I've reviewed so far for a specific study. The pial and white surfaces are merging to the outermost boundary of the brain. Provided that these are older subjects, but I didn't see this error in my experience editing older subjects in other studies. Is there perhaps a preprocessing command I could perform since this error is systematic throughout the brain, not specific to a region? Attached is an example image that showed this type of mislabeling (tried attaching more images but there were size limits).

Thank you for any input!

[image: 219.png] Batool