PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Whole body scans. Coloured computed tomography (CT) and positron emission tomography (PET) scans of a human body. PET scans are used to detect abnormal metabolic or chemical activity within the body, most often the brain, heart or tumours. A radioactive tracer, usually radiolabelled glucose, is injected into the patient's bloodstream, from where it is absorbed into active tissues. The scanner detects photons emitted by the tracer. The results are combined with CT scans to show them on slices through the body.
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