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Abstract
IntroductionPositron emission tomography targeting tau (tau‐PET) is a promising diagnostic tool for the identification of Alzheimer's disease (AD). Currently available data rely on quantitative measures, and a visual interpretation method, critical for clinical translation, is needed.MethodsWe developed a visual interpretation method for 18F‐flortaucipir tau‐PET and tested it on 274 individuals (cognitively normal controls, patients with mild cognitive impairment [MCI], AD dementia, and non‐AD diagnoses). Two readers interpreted 18F‐flortaucipir PET using two complementary indices: a global visual score and a visual distribution pattern.ResultsGlobal visual scores were reliable, correlated with global cortical 18F‐flortaucipir standardized uptake value ratio (SUVR) and were associated with clinical diagnosis and amyloid status. The AD‐like 18F‐flortaucipir pattern had good sensitivity and specificity to identify amyloid‐positive patients with AD dementia or MCI.DiscussionThis 18F‐flortaucipir visual rating scheme is associated with SUVR quantification, clinical diagnosis, and amyloid status, and constitutes a promising approach to tau measurement in clinical settings.
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