Hounsfield Units for Relative Densities of Various Substances

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Hounsfield Units for Relative Densities of Various Substances Substance                      Hounsfield Unit Air                                 -1000 Fat                                 -50 Water                              0 Soft tissue (eg muscle)    +40 Calculus                         +100 to +400 Bone                              +1000 Hounsfield units = units of x-ray attenuation used in computed tomographic scanning. Each pixel is assigned a value on a scale from -1,000 to +1,000 ArticleDate:20060911 SiteSection: Article