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Representative case of the observer performance test. (a) The CR demonstrates patchy opacity in the left middle lung field (arrow), which was initially detected by only one of three observers. (b) The CT taken on the same day shows branching opacities and centrilobular nodules at the left upper lobe. (c) The DL algorithm correctly detected the lesion (probability score, 0.577). After assistance from the DL algorithm, all observers detected the lesion.
