When people are sick, hospital doctors often have to X-ray or film the patient’s chest or other parts of the body to determine the condition. When the patient is photographed, X-rays penetrate the body, the higher the density of the material, the more powerful the absorption of X-rays, and the different densities of bones and soft tissues, the different strengths of X-rays received, which are finally displayed in the observed image, thus achieving the purpose of diagnosis. The energy of X-rays is generally tens to thousands of volts, the chest fluoroscopy is exposed to 0.02 mSv, which is about one fiftieth of the national annual limit for the public, and the lining up time is extremely short (less than a few seconds), while the fluoroscopy time is long, closely related to the doctor’s skill level, and some may take up to several minutes, because the exposure time is long, the exposure dose is large. The radiation dose to the patient is much lower than that of fluoroscopy, so people mostly use the method of filming instead of fluoroscopy to reduce the patient’s exposure dose. However, in terms of overall dose, X-ray fluoroscopy and radiographs are safe and do not pose a health risk.