DR examination is a common examination method in the imaging department, which is also called digital radiography system, and is a better examination method in the radiology department nowadays. It can also be used to examine the mediastinum and mediastinum. In addition, it can also be used to examine mediastinal and cardiac diseases and bone and joint diseases. In addition, it can also be used for gastrointestinal imaging, such as barium meal, to observe whether there is inflammation, tumors and ulcers in the gastrointestinal tract.