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Fig. 6B —Graphs show receiver operating characteristic curve of enhancement characteristics. Fraction of true-positive results (sensitivity) and false-positive results (1 minus specificity) for maximum enhancement ratio (thick solid line), slope (thin solid line), and washout ratio (dashed line) as markers of malignancy. Value of 0.5 is no better than expected by chance, and value of 1.0 reflects perfect indicator. Graph shows receiver operating characteristics curve for differentiating lung cancer from benign solitary pulmonary nodules (tuberculoma and hamartoma). Calculated area under curve is 0.87 for maximum enhancement ratio (thick solid line), 0.97 for slope (thin solid line), and 0.75 for washout ratio (dashed line).