PET Scan for Brain Aging (IMAGE) University of California - Los Angeles Caption PET brain scans reveal plaque and tangle accumulation in patients with the APOE-4 gene, which increases risk of Alzheimer's. Credit UCLA 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.