Objective To analyze the characteristics of chest computed tomography（CT） images of pneumoconiosis and the differences between CT and digital radiography（DR） chest radiographs，explore the imaging method and value of CT in the diagnosis and staging of pneumoconiosis. Methods Totally 113 patients with pneumoconiosis， who were diagnosed in the Zibo Occupational Disease Prevention and Control Hospital from November 22， 2018 to June 26， 2019， were given DR chest radiographs and high-resolution CT scans， and CT scan used 2 and 5 mm layer thickness to image respectively. The differences in imaging manifestations of small shadows， large shadows， emphysema， lymphnodes， and pleural thickening of pneumoconiosis between DR chest radiograph and CT images were compared and analyzed. Results The small shadow of pneumoconiosis DR chest film showed nodular and diffuse fibrosis changing on CT images. Nodular changes were found in 107 cases（94.69%）， showing circular and solid nodules. There were statistically significant differences between CT and DR in showing the shape and size of small shadow， mediastinal lymph node enlargement， emphysema and pleural thickening in pneumoconiosis （P<0.01）. The consistency of the two methods was poor（Kappa<0.4）. Conclusion There is a significant difference in chest CT and DR imaging findings of pneumoconiosis. CT can more accurately reflect the morphological changes of pneumoconiosis， and can more accurately reflect the condition of patients in the diagnosis and staging of pneumoconiosis.

Pneumoconiosis, Computed tomography, Chest, Digital radiography