Table 5. Reduced variability in intensity values after normalization by the three reference regions (coefficients of variation, %).

	Frontal	Parietal	Temporal(lateral)	Temporal(medial)	Occipital
Absolute CBF	46.61	46.96	46.31	45.54	44.47
CBF/CBFcer	8.69	8.76	8.62	10.37	8.72
CBF/CBFwm	7.39	7.40	7.17	11.18	9.82
CBF/CBFcgm	5.54	5.40	5.94	7.98	5.73

CBF, cerebral blood flow; CBF/CBFcgm, CBF values per region of interest normalized by whole-brain cortical gray matter; CBF/CBFcer, CBF values per region of interest normalized by cerebellum; CBF/CBFwm, CBF values per region of interest normalized by whole-brain white matter. Coefficients of variation show bilateral information per lobe in the three groups (controls, MCI and AD).