| Hounsfield, Godfrey | <person> British electronics engineer, *1919. Developed first practical computed tomography device, the EMI scanner; received the Nobel prise in Medicine in 1979 jointly with physicist A. M. Cormack. See: Hounsfield unit, Hounsfield number. (05 Mar 2000) |
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| Hounsfield number | A normalised value of the calculated X-ray absorption coefficient of a pixel (picture element) in a computed tomogram, expressed in Hounsfield units, where the CT number of air is -1000 and that of water is zero. Synonym: Hounsfield number. (05 Mar 2000) |
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| Hounsfield unit | A normalised index of X-ray attenuation based on a scale of -1000 (air) to +1000 (bone), with water being 0; used in CT imaging. (05 Mar 2000) |