Image of Amyloid PET Scan (IMAGE) Alzheimer's Association Caption Amyloid-positive (left) and amyloid-negative (right) PET scans can respectively be used to diagnose or rule out Alzheimer's disease in individuals with memory loss or cognitive decline. Credit UCSF Memory and Aging Center Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.