UAB Alzheimer's Disease Center Core Cohort - Imaging Substudy (PiB ADC)

The primary objective of this study is to measure the concentration and the regional brain distribution of pathologic amyloid deposition using the PET tracer [C-11]PiB in participants in the UAB Alzheimer's Disease Center cohort. Assessment of interactions between race and vascular risk factors, brain amyloid levels measured with [C-11]PiB-PET, and cognitive status will be the primary outcome of this imaging study.

The primary objective of this study is to measure the concentration and the regional brain distribution of pathologic amyloid deposition using the PET tracer [C-11]PiB in participants in the UAB-ADC cohort. The amount and distribution of [C-11]PiB in the brain will be correlated to demographic, clinical, genetic, and biospecimen data acquired through the separate ongoing UAB-ADC study. Assessment of interactions between race and vascular risk factors, brain amyloid levels measured with [C-11]PiB-PET, and cognitive status will be the primary outcome of this imaging study. As a secondary aim, the investigators will assess the ability of the early flow frames from [C-11]PiB-PET and brain volumetric measurements with MRI to serve as a marker of neuronal injury and to predict cognitive status in conjunction with the amyloid-PET results.

All participants in this study will undergo an amyloid-PET imaging using the tracer [C-11]PiB with a simultaneous PET/MRI system. The [C-11]PiB dosage is 300-670 MBq (8 - 18 mCi) given intravenously, and the PET/MRI imaging time is approximately 60 min.

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.

The amount of pathological beta-amyloid in the brains of study participants will be measured with [C-11]PiB-PET/MRI using standardized uptake value ratios (SUVRs) derived from the PET images.

Inclusion Criteria: - 1. Enrollment in the UAB-ADC study under a separate IRB-approved research protocol (IRB-300000169). 2. Negative urine or serum B-hCG test within 2 days of [C-11]PiB administration in women of child bearing potential. Women who are post-menopausal with at least 1 year since last menses or documented surgical sterilization will not require pregnancy testing. Exclusion Criteria: Meets any exclusion criteria for the UAB-ADC study (IRB-300000169). Inability or contraindication for undergoing MRI and/or PET imaging Inability to participate in the imaging studies due to severity of dementia