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Fig. 4B —Time-attenuation curves of each group. Time-attenuation curves of each group are displayed: group 1 (1-5 years old, contrast-covering time [CCT]) (A), group 2A (6-10 years old, CCT) (B), group 2B (6-10 years old, empiric setting) (C), and group 3 (11-15 years old, CCT) (D). Comparing groups 2A (B) and 2B (C), CCT and empiric setting both provided high enhancement with no significant difference. However, average SD of enhancement of group 2B (C) was larger than that of group 2A (B) with statistical significance, which means CCT concept provided more homogeneous enhancement than empiric setting. Furthermore, comparing three different age groups set by CCT (groups 1, 2A, and 3; A, B, and D, respectively), high and homogeneous enhancement was routinely obtained. No significant difference was found in average enhancement, slopes, or SD among the CCT groups.