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Fig. 6A —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 characteristic curve for differentiating lung
cancer from focal organizing pneumonia. Calculated area under curve is 0.72
for maximum enhancement ratio, 0.65 for slope, and 0.54 for washout ratio.
