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Fig. 2B —Nomograms for radiation dose (volume CT dose index [CTDI_vol]), noise level in SD of CT attenuation values, and size of phantom scanned with precontrast (A) and postcontrast (B) parameters. Each exponential curve shows relationship between phantom size and SD value at given tube current. Radiation dose (CTDI_vol) in parentheses increases linearly with tube current; however, data are scanner-specific (Aquilion 64, Toshiba Medical Systems) and other scanners may produce different radiation doses with same parameters. Nomogram obtained using postcontrast parameters: 120 kV, helical, retrospective ECG gating, 64 x 0.5 mm collimation, pitch of 0.204, and half reconstruction.