Amyloid PET Scans (IMAGE) University of California - Berkeley Caption PET scans reveal amyloid plaques, which appear as warm colors such as red, yellow and orange. On the left is a patient with Alzheimer's disease, and on the right is a person with no detectable amyloid deposits in the brain. The middle scan is of a normal person with no symptoms of cognitive problems, but with evident levels of amyloid plaque in the brain. Credit Susan Landau and William Jagust, UC Berkeley Usage Restrictions All rights reserved. Non-commercial use only. 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.