Commonly used methods of respiratory examination include chest fluoroscopy, chest radiographs, tomography and imaging. Various examination methods have their own advantages and disadvantages. When choosing the examination methods, we should start from simple to complex, cooperate with each other and complement each other’s strengths in order to give full play to the role of X-ray special examination and improve the diagnostic effect. The general term “chest X-ray” refers to chest fluoroscopy, full chest X-ray including conventional radiography, CR, and DR photography, and chest CT refers specifically to CT examination. I don’t know what you mean. That description is normal. Chest film belongs to one of the X-ray examination radiation, and both have their own characteristics. Chest X-ray has the advantages of displaying a large field, a single exposure to obtain the entire chest film, accepting a small dose of radiation and can permanently save the image, but can not be dynamic observation of the image; relatively speaking, chest X-ray displaying a small field, the need to constantly move the fluoroscope or detector to complete the entire chest fluoroscopy, the examination time is relatively long, accepting a relatively large dose, but the biggest advantage is that you can dynamically observe such as turning the body position, heart fluctuations or intestinal peristalsis, etc. Fluoroscopy: Chest fluoroscopy is a simple, economical and convenient method, so it is widely used in medical prevention work. However, the amount of radiation received by the physician and patient is much higher than that of radiographs, and it is not easy to detect subtle lesions and there is no permanent record of fluoroscopy.