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1 Introduction to Emergency Imaging

Fig. 1.1 CT window and level: skull fracture with epidural hematoma.

a,c Bone windows. Bone detail is superb, with clear de nition of a right temporal bone fracture. The subjacent epidural hematoma is invisible, as it is mapped to the same shade of gray as the adjacent brain.b,d Soft tissue windows. The epidural hematoma as well as the ventricles, scalp hematoma, gray mat-ter, and white matter are all clearly distinguishable. The skull fracture is visible but less well seen than on wider windows.

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