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The temperature dependence of computed tomography attenuation values.

G M Bydder, L Kreel

    Journal of Computer Assisted Tomography
    |August 1, 1979
    PubMed
    Summary
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    Computed tomography (CT) attenuation values for water vary with temperature due to density changes. This 5-6 Hounsfield unit difference impacts CT calibration and tissue value comparisons.

    Area of Science:

    • Medical Imaging
    • Physics

    Background:

    • Computed tomography (CT) is a crucial diagnostic imaging modality.
    • Accurate attenuation values are essential for quantitative analysis in CT scans.

    Purpose of the Study:

    • To investigate the effect of temperature on the computed tomography (CT) attenuation value of water.
    • To quantify the variation in CT attenuation of water across different temperatures.

    Main Methods:

    • Experimental measurement of water's CT attenuation at various temperatures.
    • Calculation of predicted CT attenuation based on water density changes.

    Main Results:

    • A temperature-dependent variation in CT attenuation of water was observed.
    • A difference of 5 to 6 Hounsfield units (HU) was measured between room and body temperatures.

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  • This variation is attributed to changes in water density.

    • Conclusions:

    • Temperature significantly influences the CT attenuation of water.
    • This finding is critical for accurate CT machine calibration.
    • It also affects the comparison of in vivo and in vitro tissue attenuation values.