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Hounsfield units

Hounsfield units

Item no.: P2550900
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Depending on the type of CT scanner and the settings, the result of a CT scan of the same material can be different attenuation coefficient (grey-values). In order to make it easier to compare CT data, espe-cially in medicine, the grey-values of a CT scan are often rescaled to a standard scale. Hounsfield units is such a scaling that uses air and water as a calibration material which is regularly used in medicine.


  1. Perform a CT scan of the calibration material
  2. Recalculate the results to Hounsfield units

What you can learn about

  • Attenuation coefficient
  • Hounsfield units

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