It is volume-based for subcortical

Dear Dr Greeve,

I interestingly read the manuscript "Different partial volume correction methods lead to different conclusions: An (18)F-FDG-PET study of aging" Thank you for publishing this data.

I understood from this paper that he recommended stream for PVC is to correct the PET images using Muller-Gartner method then feed the corrected maps into three group level analyses: surface based for left and right hemispheres then for subcortical regions..

My question is about the subcortical analysis: To describe this analysis, is it a volumetric analysis for subcortical gray matter, or surface based?

I am sorry if my questions is basics, I don't have good experience in freesurfer so I want to be sure that I am using the correct terms.

Thanks you for any advice!

J

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