NOS2 and Alzheimer disease: Several promising targets and tracers for neuroinflammation imaging have been reported but not yet been evaluated in AD patients or animal models, such as the ligands for inducible nitric oxide synthase ([18F]FBAT), reactive oxygen species ([18F]ROStrace [18F]ox-ROStrace, [18F]dihydromethidine, [11C]Ascorbic.