GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Gamma scans. Doctors examining whole body gamma radiation scintigrams (gamma camera scans) displayed on a computer monitor screen. The doctors' faces can be seen reflected in the monitor. The spine, pelvis and ribcage can be seen (red) on the scan. The images show the concentration of a radioactive isotope, technetium-99m, which is injected into the patient and becomes concentrated in bone. The technique is commonly used to detect and assess the spread of secondary cancers, which are frequently seeded in bones. Newly-formed secondary bone cancers (metastases) appear as darker "hot spots" when they are only a few millimetres in size.
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