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Fig. 3. —Graph shows alternative free-response receiver operating characteristic (ROC) curves of every monitor condition averaged for all six observers. A_z = area under alternative free-response ROC curve. a and b represent vertical intercept and slope, respectively, of alternative free-response ROC curve when it is plotted on normal—deviate axes. Note that with regard to area under average alternative free-response ROC curve, 1K monitor with postprocessing (0.73 ± 0.081) and 2K monitor with (0.75 ± 0.101) and without (0.75 ± 0.109) postprocessing have equivalent results in detecting pulmonary nodules in digital chest radiographs in clinical interpretation environment. 1K monitor without postprocessing performed poorly (0.69 ± 0.086). 1K overview, a = 0.65, b = 0.81, A_z = 0.6931. 2K overview, a = 0.86, b = 0.76, A_z = 0.7524. 1K with postprocessing, a = 0.81, b = 0.84, A_z = 0.7330. 2K with postprocessing, a = 0.85, b = 0.75, A_z = 0.7504.