CT is somewhat radioactive. CT belongs to X-ray imaging technology, which is still harmful to human health. However, with the continuous development of CT technology, the X-ray radiation dose of CT has been controlled within a safe range, and CT examination will not cause a large impact on most people. Moreover, CT has been widely used in clinical practice due to its special diagnostic value. However, CT equipment is more expensive, the cost is on the high side, and the CT diagnostic radiation dose is larger than that of ordinary X-ray machines, so pregnant women should not undergo CT examination, and if the CT examination is performed many times, it is still very harmful to the body, so it is still necessary to try to control the number of times of taking CT. Adults should not undergo CT at intervals of less than half a year, and adolescents and children, need to be examined at least one year or more apart.