The reduction of acetylcholinesterase (AChE) activity in the brain has been measured in dementia disorders such as Alzheimer's disease and dementia with Lewy bodies using 11C- labeled acetylcholine analogues, N-[11C] methylpiperidin-4-yl acetate and propionate, and positron emission tomography (PET). Our aim was to develop an 18F-labeled acetylcholine analogue useful for brain AChE mapping with PET, since 18F, with a longer half-life, has ...