HANK MORGAN / SCIENCE PHOTO LIBRARY HANK MORGAN / SCIENCE PHOTO LIBRARY
PET scanning. View of a patient undergoing a Positron Emission Tomography (PET) brain scan, as seen from the radiographer's control room. In the background is the scanner with the patient's head passing into the detector. In the foreground, a radiographer sits at the scanner's computer. On the computer monitor is a coloured image of a "slice" through the patient's brain (active areas are red; inactive are blue). PET scanning shows the metabolic activity of the brain. A radioactive tracer is injected into the patient's bloodstream, and absorbed by active tissues of the brain. Here the brain of a sleeping patient is being scanned, to be compared with the brain of an awake patient.
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