thermography
Photographic recording of heat patterns. It is used medically as an imaging technique to identify ‘hot spots’ in the body – for example, tumours, where cells are more active than usual. Thermography was developed in the 1970s and 1980s by the military to assist night vision by detecting the body heat of an enemy or the hot engine of a tank. It uses detectors sensitive to infrared (heat) radiation.
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