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Hi Freesurfer Team and Doug,

Is there any way to derive the gtmstats from Petsurfer within a longitudinal 

Could I get your take on the steps below?

1. Extract GTM stats from each PET time-point (registered to the closest 
structural MRI in time).
2. Manually compute the percent change per region across time-points.

Alternatively, would it be more ideal to resample the PET data to the surfaces 
at each time point before extracting the MGX-based ROI PET data with 
mri_segstats? With this approach, it would be possible to use the longitudinal 
commands, right?


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