[Freesurfer] Extracting SUV values from Freesurfer ROIs

*Dear Freesurfers,*

I apologize if this question has already been asked somewhere - I didn't manage to find the answer in the archives. I have my T1 images processed in FS_5.3 and corresponding PET images co-registered with rawavg.nii-images in SPM (converted from mgz). Now I would like to extract standardized uptake values from the Freesurfer's ROIs (aparc.a2009s+aseg.mgz) in native space. Is there a straightforward way to do this? (preferably, in one command without creating multiple labels from the parcellation) Thank you very much in advance. *=======* *Best Regards,* *Alexander Lebedev* University of Bergen, Norway