Dosimetry – CTDIvol

• CTDIvol takes account of exposure variation in the z axis

• CTDIvol = CTDIw (helical)  Pitch

• CTDIvol = CTDIw x packing factor (axial)

Pitch = 1

CTDIvol = CTDIw

Pitch = 2

CTDIvol = CTDIw/2

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