[Freesurfer] options for extensive atrophy

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Hi,

I wanted to ask for suggestions on how segmentations and surface reconstruction for CT could be improved in individuals with extensive atrophy. I noticed that with my data, FreeSurfer outputs (version 7.4.1) have significant errors especially in areas affected by atrophy in that GM is undersegmented. On the other hand, in controls I sometimes see the opposite issue, where parts of the skull are included as GM.

I have been exploring options like -seg-wlo and -bigventricles to improve the output but wanted to see if anyone has encountered similar issues and had other ideas.

Thanks, Amelie