The CT radiation exposure has certain radiation, if the location of the exposure is in the abdomen or the number of exposures is too much, it may affect the fetus. Specific analysis is as follows: 1. Week of pregnancy: The results of relevant studies show that CT examinations performed within 4 weeks of pregnancy have almost no effect on the fetus, and will not affect the growth and development of the fetus. After the fourth week of pregnancy, CT examinations can be dangerous when the radiation dose is greater than 50mGy. Therefore, the effect on the fetus can be almost negligible if a CT examination is done once in a while, as long as it is not on the pelvis or the lumbar abdomen. 2. Location of CT exposure: If the location of CT examination is not pelvic or lumbar abdomen, and it is in the bedtime, generally it will not be affected. If the location of CT examination is the pelvis and waist abdomen, the fetus has already formed, especially in the neurodevelopmental stage, it is recommended to observe for a period of time and do pregnancy checkups in time to see if the fetus has any malformation; 3, the number of CT: CT radiation is ionizing radiation, which is more powerful than the non-ionizing radiation of ordinary home appliances and can easily affect the fetus. If it is necessary to do CT examination, it can be carried out, but regular pregnancy checkups are needed to observe the fetal status. In case of developmental abnormalities, choose the abortion method depending on the situation. During the preparation and pregnancy, women should avoid exposure to larger radiation or substances with chemical components, and should not take random medications to ensure the health of the fetus.