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11C-PiB ROCs from the average SUVRs between elderly cognitively normal individuals and AD patients, with the ROCs indicating high AUCs, and the very high diagnostic performance of PiB in the precuneus, posterior cingulate, and orbitofrontal regions. ROCs: Receiver-operating characteristics; 11C-PiB: 11C-Pittsburgh compound B; SUVRs: Standardized uptake value ratios; AUCs: Areas under the curves
