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Weighted and volumetric CTDI

CTDI_w = 10.67 mGy

CTDIw=13CTDIc+23CTDIp,CTDIvol=CTDIw/pitch\mathrm{CTDI}_w=\tfrac13\mathrm{CTDI}_c+\tfrac23\mathrm{CTDI}_p,\quad \mathrm{CTDI}_{vol}=\mathrm{CTDI}_w/\mathrm{pitch}

CTDI_w and CTDI_vol from center, periphery, and pitch.

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