Women should wait at least three months before having children after a CT examination. CT is a commonly used imaging method, and its principle is the ionizing radiation imaging of radioactive elements, so CT examination will be subject to certain radiation, but the amount of radiation is small, and for normal healthy people, the radiation caused by CT will not cause damage to the body. However, for women who are preparing for pregnancy, CT examinations should be performed with caution. Although CT examinations are low in radioactivity, there is no guarantee that no radioactive material will remain in the patient’s body after the CT examination. It takes at least 2-3 months or even longer for radioactive substances to metabolize in the body, and if you get pregnant during this period, the fetus may be affected by radioactive elements. Therefore, CT examinations should be avoided during pregnancy and pregnancy preparation in general, except for very special cases, and if you are exposed to CT during pregnancy preparation, you need to delay pregnancy for at least three months to ensure eugenics.