Fig. 2.

Flowchart of the performance test. The dataset included 100 normal chest radiographs (CXRs) and 200 CXRs with 216 pulmonary nodules. The 216 pulmonary nodules consisted of 107 nodules in the non-danger zone (NDZ) and 109 nodules in the danger zone (DZ). Eight observers reviewed each chest radiograph twice, with and without the deep learning-based nodule detection (DLD) system. The order of each radiograph was randomly assigned before each session and a 4-week washout period was ensured between two reading sessions