CT head (subdural window)

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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; window 130 HU
center/level 70-100 HU; window 150-300 HU