CT head (subdural window)

Last revised by Andrew Murphy on 23 Mar 2023

The subdural (blood) window can be used when reviewing a CT brain as it makes intracranial hemorrhage more conspicuous, and may help in the detection of thin acute subdural hematomas that are against the calvaria that are similar density to adjacent bone. It is a wider setting than the standard non-contrast window, and there are a number of parameters that can be used: 

  • center/level 50 HU; width 130 HU 1
  • center/level 70-100 HU; width 150-300 HU 3

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3: bilateral
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  • Case 4
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