CATHERINE POUEDRAS / SCIENCE PHOTO LIBRARY CATHERINE POUEDRAS / SCIENCE PHOTO LIBRARY
Positron emission tomography (PET) brain scanning, showing the radiographer about to inject the radioisotope & the patient's head surrounded by the detector. PET is used to study the level of function in tissues, compared to the structural information provided by computed tomography (CT) and magnetic resonance imaging (MRI). Here, a radioactive analogue of glucose (18FDG) is being used to study brain metabolism in relation to Alzheimer's disease, a type of dementia. The level of metabolic activity across the brain is represented by the amount of radioactivity detected and displayed as a colour-coded, cross-sectional image by a computer.
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