[Freesurfer] PetSurfer: subcortical volume-based analysis

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Dear Freesurfer Developers

I am doing an ROI--based amyloid PET scan analysis. I have completed all of the steps from the PetSurfer wiki. I now have the preprocessed, averaged, resampled, smoothed PET data in MNI305 space which is constrained to the subcortical gray matter mask.

How do I extract mean intensity within all of the subcortical ROI?

Thank you!

Warm regards,

Jennifer Bramen, PhD (she/her/hers) Senior Research Scientist, Neuroimaging Assistant Professor Pacific Brain Health Center | Pacific Neuroscience Institute & Foundation | Providence Saint John's Health Center 1301 20th St. #150 Santa Monica, CA 90404 Phone: 310-525-0865 | Fax: 310-315-4069