1.Fluoroscopy: It is a commonly used radiological examination method, mainly for the examination of chest and lung diseases including respiratory system, thorax, mediastinal diseases and circulatory system diseases, and also for the whole body examination when health screening or other system diseases are suspected. The advantages are easy operation, fast results, low cost, dynamic observation of organs, and easy understanding of the location of lesions. The use of TV-enhanced fluoroscopy devices can improve the display rate and diagnostic accuracy of diseases, and the combination of image enhancement devices and computer graphics processing systems can record the image information seen in fluoroscopy. 2.Telephotography: It is the most widely used clinical examination method with clear image, good contrast, low cost and easy image review. It is used for routine imaging of all parts of the body, especially the bone and joint system, the chest and lungs, and the head and neck. Conventional radiography is the process of developing the film and observing the image on the film to make a diagnosis of the disease. It is influenced by many factors, such as the cleanliness of the intensifying screen in the dark box, the exposure conditions, the temperature of the film processing solution, and the conditions of the darkroom, so it requires a high level of detail throughout the entire process. If something goes wrong in one of these areas, it may be necessary to re-shoot. The blackness of the developed film cannot be adjusted, and less diagnostic information is obtained, which is not conducive to the diagnosis of diseases. This technology is being eliminated by CR or DR.