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Fig. 2A —Nomograms for radiation dose (volume CT dose index
[CTDIvol]), 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 (CTDIvol) 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 precontrast parameters: 120 kV, 180-mm field of view, 4 x 3 mm
collimation, sequential, prospective ECG gating, and half exposure.
