Analysis of XTR006 PET Imaging in Non-cognitively Impaired Subjects, MCI Due toAD, and Mild to Moderate AD Subjects

XTR006 is a 18F-labeled PET tracer, for the quantification of neurofibrillary tangle (NFT) deposition in the brain. Brain NFT deposition is a pathologic finding in Alzheimer's Disease (AD), with brain NFT density shown to correlate with the severity of cognitive impairment in AD. 90 Chinese subjects (30 subjects with non-cognitive impairment, 30 subjects with MCI due to AD and 30 subjects with mild to moderate AD) who meet all of the inclusion and none of the exclusion criteriawill be enrolled in this IIT study. Subjects will receive 8-10mCi of XTR006 via IV injection. qualitative reading and quantitative analysis methods will be investigated. Safety and tolerability will be observed.