An imaging process like MRI or CT, that provides specific information about brain activity and structure that has been used to assist in the diagnosis of AD and track its progression, especially the loss of energy metabolism in those areas of the brain affected by the disease.
Postiron Emmision Tomography. A nuclear medicine imaging prodecure employing radioactive (unstable) isotopes that decay (stabilize) by emitting a positively charged electron from the nucleus. These radioactive isotopes are bound to compounds or drugs that are injected into the body and enable physicians to study the physiology of normal and abnormal tissues. The study is usually called a "PET scan." It can be used in radiation treatment planning to help identify tumor tissue by the behavior of its cells, sometimes in cases where the tumor tissue is not visible on CT scans or MRI.
(photon emission tomography) a type of brain scan that can be used to monitor the brain's activity and detect abnormalities in how it works.