UAB Alzheimer's Disease Center Core Cohort - Imaging Substudy

All study participants will undergo brain imaging with \[C-11\]PiB-PET/MRI. \[C-11\]PiB is a PET imaging agent used primarily to measure the amount of abnormal protein (called beta-amyloid) in the brain. The investigator will also use this tracer to evaluate regional cerebral blood flow.