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I want to segment registered PET to T1 MRI to 45 subcortical regions as the regions in aseg.stats of MRI. I used mri_segstats --seg MRI-floder/mri/aparc+aseg.mgz --reg Pet2T1.register.dof12.lta --sum petsuv.segstats.dat --i PET-SPM.mgh --ctab-default into petsuv.segstats.dat, I found only 40 regions, not as aseg.stats what should I change in my commend?