GEOFF WILLIAMS / SCIENCE PHOTO LIBRARY GEOFF WILLIAMS / SCIENCE PHOTO LIBRARY
Female breast. Thermogram of a normal breast seen from the side. Thermography is an imaging technique used to visualise temperature distribution. It relies on the emission of long wavelength infrared radiation from the surface in proportion to its temperature. The radiation is detected electronically, and processed to give a temperature 'map'. Here, the warmest areas show as white and the coolest as blue, according to the scale bar at right. Note the relative coolness of the breast compared to the lower chest. The slightly warmer lines (yellow) are the result of blood vessels near the surface. The woman's arm is at the right edge of the frame.
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