There is a certain amount of radiation, but the dose used for routine diagnostic X-rays or CT examinations is very small and usually limited to the safe dose range, which generally does not cause harm to the body. Compared with ordinary X-ray, CT radiation is a bit higher, related to the CT scan site, imaging clarity. However, the single radiation dose is also within the safe range, so there is no need to worry too much. Ionizing radiation causes specific damage to the body to have certain conditions, that is, the amount of radiation to reach a certain threshold. The threshold is equivalent to 100 chest X-rays or 50 head CTs or even 15 lung CTs for adults at one time, and it is not possible or necessary for normal people to be examined in this way. However, for pregnant women, infants, and the elderly, the sensitivity to ionizing radiation is greater than that of ordinary people, so the smaller the dose of exposure, the better.