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Fig. 4 —Graph shows contrast phase versus tumor-to-liver contrast. Tumor-to-liver contrast peaks in early hepatic arterial phase (HAP) and then decreases rapidly. This value turns negative during portal venous phase (PVP) and equilibrium phase (EP). Significant differences in mean tumor-to-liver contrast (p < 0.005) exist between all phases but not between unenhanced and portal venous phases, unenhanced and equilibrium phases, or portal venous and equilibrium phases. Pre = before contrast injection.