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Fig. 5 —Graph showing scan delay after trigger-versus-mean hepatocellular carcinoma-to-liver (HCC-to-liver) contrast and CEI of liver with chronic liver damage and HCCs. Mean HCC-to-liver contrast was high (39-44 H) at 10-15 seconds, gradually reduced, and then fell below zero at 45-55 seconds. But there was no significant difference in HCC-to-liver contrast. Mean CEI of liver parenchyma in patients with HCCs increased constantly from 5 to 30 seconds and then plateaued at 45-55 seconds. Note that x-axis is indicative not of time course (repeated measurement) but of three different subgroups with different imaging delays, comprising 57 patients each. Error bars = standard errors of means.