The Temperature Dependence of Computed Tomography Attenuation Values

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Abstract
The variation in the computed tomography (CT) attenuation value of water with temperature was investigated. A difference of 5-6 Hounsfield units (1000 scale) between typical room and body temperatures was due to a change in the density of water. This difference may be of significance for the calibration of CT machines, determination of absolute CT attenuation values for body tissues and fluids and comparing tissue attenuation values obtained in vivo and in vitro.

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