• Antoine Leuzy, Elena Rodriguez-Vieitez, Laure Saint-Aubert, Konstantinos Chiotis, Ove Almkvist, Irina Savitcheva, My Jonasson, Mark Lubberink, Anders Wall, Gunnar Antoni, and Agneta Nordberg.
• Division of Translational Alzheimer Neurobiology, Department of Neurobiology, Care Sciences, and Society, Karolinska Institutet, Stockholm, Sweden.
• Alzheimers Dement. 2018 May 1; 14 (5): 652-663.

IntroductionCross-sectional findings using the tau tracer [18F]THK5317 (THK5317) have shown that [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET) data can be approximated using perfusion measures (early-frame standardized uptake value ratio; ratio of tracer delivery in target to reference regions). In this way, a single PET study can provide both functional and molecular information.MethodsWe included 16 patients with Alzheimer's disease who completed follow-up THK5317 and FDG studies 17 months after baseline investigations. Linear mixed-effects models and annual percentage change maps were used to examine longitudinal change.ResultsLimited spatial overlap was observed between areas showing declines in THK5317 perfusion measures and FDG. Minimal overlap was seen between areas showing functional change and those showing increased retention of THK5317.DiscussionOur findings suggest a spatiotemporal offset between functional changes and tau pathology and a partial uncoupling between perfusion and metabolism, possibly as a function of Alzheimer's disease severity.Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.

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