RICHARD D'AMICO MD / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY RICHARD D'AMICO MD / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Bone scan. Computer-enhanced coloured scintigram (bone scan) showing a normal subject in anterior (left) and posterior views. A gamma camera records the distribution of gamma radiation from a tracer which concentrates in bone. The tracer, methylene diphosphate linked to the isotope technetium-99m, is injected into the body before the scan is taken. Bone scans are often used to screen cancer patients for evidence of secondary disease after they have received treatment for primary cancers. Bone metastases (secondary bone cancers) absorb the tracer in greater amounts than normal bone & this shows up as brighter spots on the image.
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