Fig. 4.

Plot of [¹¹C]PiB SUVR vs. visual rating for all subjects. Black triangles indicate a PiB(+) rating by both SUVR and visual ratings, black circles indicate a PiB(−) rating by both SUVR and visual ratings. Gray triangles indicate a PiB(+) rating by SUVR and a PiB(−) visual rating. Points for subjects with a clinical AD diagnosis are under-struck with a red box. The line is the result of a linear regression over all 23 subjects (y = 0.28 × + 1.02; R² = 0.63).