Group results comparing (left) relative cerebral glucose metabolism (CMRglc) and (center) cerebral blood flow (CBF) by FDG-PET and ASL-perfusion fMRI during visual stimulation from 5 subjects. (Right) Results of the SPM group analysis of the contrast between CMRglc and CBF (paired t-test, uncorrected p<0.005, extent threshold k>30 voxels). Note CMRglc showed higher signal in bilateral basic ganglia (red) and CBF showed higher signal in visual cortex (blue).

Image Courtesy: Andrew Newburg, MD; NeuroImage