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FIG 6. Average CBF values of the whole section (pixels) with both CT and PET against varying VPE threshold values in subject 1. Without VPE (plotted at the most right-hand side, threshold of 104 mL/100 g), the CT-CBF value is higher than the PET value. CBF values with PET are almost constant despite the change in the VPE threshold. As the VPE threshold decreases, CBF values with CT decrease and approach the corresponding PET values. * indicates a statistically significant difference (P < .01)
