Figure 2. Standardized Uptake Volume Ratios of Fluorine 18–Labeled AV-1451 in Patients With Parkinson Disease and Control Participants, Stratified by Alzheimer Disease Braak Stage.

Violin plots show [¹⁸F]AV-1451 positron emission tomography mean standardized uptake volume ratios in regions of interest derived from Alzheimer disease Braak stages. In each region of interest, significant differences were found between β-amyloid–positive controls and β-amyloid–negative controls, β-amyloid–positive controls and patients with Parkinson disease with mild cognitive impairment, and β-amyloid–positive controls and patients with Parkinson disease who were cognitively normal.