UAB Alzheimer's Disease Center Core Cohort - Imaging Substudy

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.

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: 1. Meets any exclusion criteria for the UAB-ADC study (IRB-300000169). 2. Inability or contraindication for undergoing MRI and/or PET imaging 3. Inability to participate in the imaging studies due to severity of dementia