At present, among all the X-ray imaging inspection equipment, filming is the inspection method with the highest radiation dose, the longest exposure time, the worst radiation safety, and also the most harmful. Larger hospitals now routinely use CT instead of filming or have upgraded to DR, but filming is still used in ordinary hospitals, and the ionizing radiation produced by X-rays can cause serious harm to the human reproductive system, genes, and the blood system. Therefore, the time between two checkups should not be less than half a year for adults and at least 2-3 years or more for teenagers and children, in order to effectively minimize or avoid unnecessary injuries.