Whether there is radiation in filming depends on the type of examination or the principle of filming, for example, X-ray and CT examinations, which utilize X-rays, will produce a certain amount of radiation on the human body, but the dose of radiation is related to the type of machine, scanning site, time and irradiation conditions, and so on. A normal X-ray examination is relatively less radioactive than a CT examination, but either type of examination is within the safety limits set by the state. The doctor will try to choose the one with less radiation according to the patient’s specific situation. If a patient has an MRI taken, there is no radiation because it is done using the movement of hydrogen nuclei in the body in a magnetic field. But practically every examination has certain indications and contraindications, and in most cases there is no substitute. So as long as the standardized operation, avoid unnecessary duplication of the examination can be.