What is a Positron Emission Tomography (PET scan)? Why is it used?
-provides info about the FUNCTION of the brain, specifically glucose and O2 metabolism and cerebral bloodflow (CT provides info about structure only)
-used to detect areas of metabolic alteration (dementia, epilepsy, psych and degenerative disorders, neoplasms, Alzheimers)
-Deoxyglucose is injected which is tagged to an isotope, the isotope emits activity (positrons) which are scanned and converted to a color image by the computer, the more aciteve a given part of the brain the more glucose uptake