Keywords: PET Normal brain.jpg en PET scan of a normal human brain http //www nia nih gov/Alzheimers/Resources/HighRes htm US National Institute on Aging Alzheimer's Disease Education and Referral Center PD-USGov-HHS Courtesy Alzheimer's Disease Education and Referral Center a service of the National Institute on Aging PD-USGov Positron emission tomography Brain |