Computed Tomography (CT) - Hounsfield Units and Contrast ...
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Computed Tomography (CT) - Hounsfield Units and Contrast Phases

Hounsfield Units (HU): measurement of CT attenuation

     Air -1000

     Fat -100

     Water 0

     Blood 50

     Soft tissue 100

     Bone 1000

     Metal >2000

Windowing and leveling: adjusting contrast and brightness to highlight structures

 • Window (contrast): range of Hounsfield units displayed across the grayscale

     - Wide window – best for large differences in attenuation

     - Narrow window – best for subtle differences in attenuation

 • Level (brightness): HU that corresponds to mid-gray

     - High level – best for structures with high attenuation

     - Low level – best for structures with low attenuation



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Account created for the MGH Internal Medicine Housestaff Manual "White Book" - https://stk10.github.io/MGH-Docs/WhiteBook-2019-2020.pdf
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