CENTRE JEAN PERRIN / SCIENCE PHOTO LIBRARY CENTRE JEAN PERRIN / SCIENCE PHOTO LIBRARY
Human lungs. False-colour computer enhanced gamma scan (scintigram) of healthy human lungs. The lungs appear inflated. The central region of the lungs (red) has absorbed more radioactive tracer than the outer regions (yellow, green). Gamma scanning involves introducing a radioactive iso- tope into the body, in this case Technetium detected by a gamma camera. The isotope emits gamma rays which are detected as flashes of light. Isotopes are chosen for their ability to gather in cancerous or inflamed tissue, producing "hot spots" that would be highlighted on the scan. Gamma scan sections of lung tissue can be examined in slices.
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