Thus, in this study, we evaluate the efficacy of DCNNs in differentiating subtle, intermediate, and more obvious image differences in radiography. For subtle, we chose ET tube position on single-view chest X-rays—that is, to distinguish between a satisfactory and a low abnormal position. For intermediate, we distinguish between the presence and absence of an ET tube. For more apparent differences, we simply distinguish between chest and abdominal radiographs.