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Fig. 4. —Graph shows receiver operating characteristic (ROC) curves for values of liver perfusion (solid line), arterial fraction (dotted line), and mean transit time (dashed line) used in diagnosing cirrhosis. We found no statistically significant difference in area under three ROC curves (liver perfusion, 0.81 ± 0.07; arterial fraction, 0.78 ± 0.08; mean transit time, 0.89 ± 0.05; p > 0.1), indicating no significant difference in accuracy of these three perfusion parameters when diagnosing cirrhosis.