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Prediction of mean cortical standardized uptake value ratio (SUVR) by neural network models. The relationship between predicted and actual mean cortical SUVR for models using cerebrospinal fluid (CSF) (A, B) or plasma amyloid beta (Aβ)42/Aβ40 (A, C) are shown. Asymptotic regression was used to identify the maximum level of amyloid burden at which CSF and plasma Aβ42/Aβ40 accurately predicted mean cortical SUVR (A).
