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Fig. 7 —Graph showing scan delay after trigger versus qualitative degree of tumor arterial enhancement, washout of hepatocellular carcinoma (HCC), and mean degree of liver with chronic liver damage and HCCs. Mean degree of tumor arterial enhancement was higher at 10-15 seconds than at 5 seconds (p < 0.01) and higher at 20 seconds than at 25-30 seconds (p < 0.01). Mean degree of tumor washout was high at 45-55 seconds, although difference was not significant. Mean degree of liver parenchyma in patients with HCCs constantly increased at images obtained with scan delay of 5-45 seconds and then plateaued. Note that x-axis is indicative not of time course (repeated measurement) but of three different subgroups with different imaging delays, comprising all of 30 patients. Error bars = standard errors of means.