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Fig. 2C —Box-and-whisker plots show median (middle line of each box), quartiles (top and bottom lines of each box), and upper and lower adjacent (upper and lower whiskers for each box) values for (A) tumor, (B) liver, and (C) tumor-to-lesion attenuation difference (TLAD) in each group in first- (light gray) and second- (dark gray) phase images. Mean value for TLAD1 gradually increased in groups 1 through 4 with increasing scan delay time. Mean TLAD1 of groups 4 through 6 and mean TLAD2 of groups 1 through 4 were not statistically significant.