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Comparison of the perfusion models versus FDG across participants. Scatter plots between PiB-R1 and FDG (top), and between ePiB and FDG (bottom) in the precuneus (right panel), the inferior parietal (middle panel), and in the hippocampus (left panel). Across the 110 participants, the PiB-R1 values better correlated with FDG than ePiB values did. Abbreviations: FDG, 18F-fluorodeoxyglucose; PiB, 11C-Pittsburgh compound B; EPiB, early frames of the PiB scan.
