ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour bone scintigram of the head, neck & skull areas of a normal, healthy person. The image is produced by recording the distribution of gamma rays emitted after a small amount of a radio- isotope has been injected into the patient. The gamma rays are recorded by the light they give off when they strike a scintillating material in a "gamma camera". In this instance the radiation uptake in bone is being measured, a procedure which is typically used to assess the presence or extent of secondary bone cancers. Cancerous bone absorbs the radio-isotope more strongly than healthy tissue, & produces a brighter, "hotter" area on the image.
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