DR, also known as digital radiography, receives X-rays not from ordinary film or imaging plates that need to be scanned by laser to read information, but from various types of flat panel detectors. The higher the spatial resolution, the higher the sex-to-noise ratio, the faster the imaging speed, the lower the exposure, i.e., the radiation dose, and the longer the life of the detector compared to ordinary radiography. It is superior to conventional X-rays in the observation of calcified lesions such as pneumatosis, abdominal distention and stones, and it is also much better than conventional radiography in gastrointestinal contrast imaging.