RICHARD LOWENBERG / SCIENCE PHOTO LIBRARY RICHARD LOWENBERG / SCIENCE PHOTO LIBRARY
False-colour thermogram of a pregnant woman. Thermography is a technique for visualising skin and body temperatures. Long-wavelength infrared radiation is emitted by the skin in proportion to the skin temperature. This heat radiation is detected electronically by the thermographic camera, and processed to give images such as this. The different colours represent different temperatures, from black (coolest) to white (warmest). Skin temperature may reflect the volume of blood supply across parts of the body, and can highlight a variety of circulatory disfunctions.
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