CT head (subdural window)

Dr Daniel J Bell and Dr Henry Knipe et al.

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. 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; window 130 HU 1
  • center/level 70-100 HU; window 150-300 HU 3
CT examinations
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Article information

rID: 48361
Section: Approach
Synonyms or Alternate Spellings:
  • Blood window
  • Subdural window

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Cases and figures

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  • Case 3: bilateral
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  • Case 4
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