CT 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) ...
Found on http://www.mondofacto.com/facts/dictionary?CT+number

CT number

the attenuation value determined for each pixel in a CT scan on a scale in which water is 0, compact bone +1000, and air −1000. See Hounsfield unit.
Found on http://www.encyclo.co.uk/local/21001

CT number

Type: Term Definitions: 1. a normalized 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 0. Synonyms: Hounsfield number
Found on http://www.medilexicon.com/medicaldictionary.php?t=61833
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