False-colour scintigram of normal human knees

False-colour scintigram of normal human knees

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Credit: CNRI/SCIENCE PHOTO LIBRARY

Caption: False-colour scintigram (gamma camera scan) of normal human knees, revealing the joint cartilages in red & white. The gamma scan is a map of radioactivity emitted from an isotope, technetium- 99m, that was injected intravenously into the subject prior to taking the scan. Technetium-99m (Tc-99m) is readily taken up by bone and cartilage & this technique is often used to diagnose secondary bone cancer (metastases). Cancerous bone concentrates the isotope more strongly than normal bone & this shows up as brighter, "hot spots" on a scan.

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Keywords: anatomy, bone, bones, cartilage, false-coloured, gamma scan, human body, knee, knee joint, scintigram, skeleton

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