Women can have children after one month without much effect on conception after CT. CT and X-rays, which are commonly used in medicine, are subconsciously rejected because of the radiation, and CT and X-rays are contraindicated for the special group of pregnant women. In fact, radiation damage is related to the radiation dose, and there is a threshold for the adverse effects of radiation on people and embryos, which means that the radiation received must reach a certain level to cause damage. The threshold of teratogenic dose is 50-100 mSV for 0-2 weeks of gestation, which mainly causes fetal death; for 2-8 weeks of gestation, the threshold of teratogenic dose is 200 mSV, which mainly affects congenital malformations. In general, the radiation dose of a chest CT is 8mSV, which is much smaller compared to 50mSV. In addition, the hospital will do appropriate protection measures for the person undergoing the examination, using lead caps, lead collars, lead aprons, etc. to protect the head, thyroid, genitals and other organs. Therefore, women do not need to be nervous after CT and can have children after one month. Therefore, even if a CT test is done without knowing the pregnancy, there is no need to give up the pregnancy because of it. Of course, there is a certain probability of miscarriage, malformation, various hereditary diseases, etc. even if you do not have a radiological examination.