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Axial images and the related SDs, CNRs, and CTDIvol of the 1-year-old child phantom head exposed to three series (80, 100, and 120 kVp) of tube voltages/currents (A) and those of the 1-, 5-, and 10-year-old children phantom heads exposed to the optimal voltage/current, i.e. 80 kVp/80 mA, 80 kVp/120 mA, and 80 kVp/ 150 mA, respectively (B). Abbreviations: SD, standard deviation; CNRs, contrast noise ratios; CTDIvol, volume computerized dose index.
