CT examinations have some radiation, and the radiation dose from CT examinations of the nose is similar to the radiation dose from CT examinations of other parts of the body. If the radiation dose of CT examination is done only occasionally 1-2 times in a year, it is not very harmful to the human body. The amount of specific radiation dose is mainly related to the length of time the body is exposed to radiation during CT examinations. CT examination of the nose is mainly used for the diagnosis of nasopharyngeal or sinus diseases, especially for whether there is bone destruction at the base of the skull in patients with nasopharyngeal cancer, which can determine the specific site of sinus inflammation, the severity of inflammation, as well as the diagnosis of sinus cysts or sinus malignant tumors, and whether there is bone destruction in sinus malignant tumors, and whether there is invasion of surrounding tissues with significant reference value. Because CT has a certain amount of radiation and children are sensitive to radiation, children should avoid nasal CT examinations as much as possible, unless they need surgery to consider CT examinations.