When performing a radiologic examination, if you choose to have an ordinary CT, the orthostatic radiation dose to the chest can be as high as 5 to 8 msV (millisieverts), whereas the radiation dose of an ordinary chest radiograph is only 0.02 msV, but if you choose to have an enhanced CT, the radiation dose will be even higher. However, the radiation produced during a chest CT examination is generally not a threat to the human body and is usually within safe limits. The test can be repeated once a year, and the risk to the human body is so minimal that no special treatment is usually required. The radiation level of a chest X-ray is low, and the information obtained is relatively small. You need to adjust your mind before the chest examination to avoid excessive worry, and if you have any questions before the examination, consult your doctor in time.