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Fig. 7. —Graph shows alternative free-response ROC curves for all six observers on 2K monitor with voluntary postprocessing. Note that on 2K monitor with voluntary postprocessing, observer 6 achieved highest area under curve value (0.89) in this alternative free-response ROC analysis. Again observer 2 showed inferior performance compared with other observers (area under curve, 0.62). Observer 1, a = 0.97, b = 1.21, A_z = 0.7311. Observer 2, a = 0.30, b = 0.30, A_z = 0.6130. Observer 3, a = 0.30, b = 0.21, A_z = 0.6150. Observer 4, a = 1.12, b = 1.20, A_z = 0.7645. Observer 5, a = 0.56, b = 0.48, A_z = 0.6923. Observer 6, a = 1.83, b = 1.12, A_z = 0.8882.

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