ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Bone scan of a pair of hands.Coloured radionuclide bone scan (gamma scan or scintigram) of a pair of human hands. A fuzzy outline of the open hand is seen, with bones coloured orange. In this diagnostic technique a radioactive tracer substance is injected into the blood that concentrates in bone. The substance is then detected using a gamma camera. Bone scans are often used to screen cancer patients for evidence of secondary disease after they have received treatment for their primary cancers.
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