Hello,

I’ve been running RBV partial volume correction on some amyloid PET data recently using mri_gtmpvc, and for ~90% of subjects the resulting rbv.nii.gz looks as expected with the exception of negative values in the bilateral accumbens (see attached image, thresholded from 0-4000 in scanner units). Any ideas why this might be happening?

This is the command I’ve been using:

mri_gtmpvc --i $PETimg \
--reg $identity_mtrx  \
--seg $FSdir/${subject}/mri/gtmseg.mgz \
--psf 6 --default-seg-merge --auto-mask PSF .01 --rbv \
--no-rescale --threads 8 \
--o $outname

Thanks very much,

Dan