Figure 1. Boxplots of [11C]PiB retention as a function of neuritic plaque score and Thal amyloid phase in Lewy body disease.

Partial correlations adjusting for the interval between [¹¹C]Pittsburgh compound B (PiB) PET and death: (A) neuritic plaque score (r = 0.62, p = 0.0075) and (B) Thal amyloid phase (r = 0.45, p = 0.07). A typical cut point for [11C]PiB positivity is 1.2. Filled circles indicate dementia with Lewy bodies; open diamonds, Parkinson disease with mild cognitive impairment and Parkinson disease with dementia. SUVR = standardized uptake value ratio.