It is best to take a 3-month interval before having a child after a CT examination. At present, CT examinations are available in all major hospitals. CT examinations are currently used as a routine examination in hospitals, and its radiation dose is not large. However, for the sake of insurance, it is better for a woman to take an interval of more than 3 months before having a child after undergoing a CT examination. However, if there is an acute abdomen or suspected lung nodules during pregnancy, and there are strong indications for a CT test, you need to discuss with your doctor to understand the pros and cons, and you should still have a CT test if necessary. There are scientific studies that show that CT and X-ray radiation is one of the major causes of fetal malformations, thus, CT is not recommended for pregnant women throughout their pregnancy, and women who are preparing for pregnancy should also avoid exposure to CT, so it becomes extremely important for pregnant women to understand CT and the precautions to take during pregnancy preparation. Some women find out they are pregnant soon after the CT is taken, don’t panic too much, go to the regular hospital in time, follow the medical advice, do a good job of pregnancy checkups, and once abnormalities are found, treat them in a timely manner. Female doctors working in radiology should also get pregnant one year after leaving the department. Although some studies point out that the amount of CT radiation nowadays is very small, it is recommended that pregnant women avoid exposure to CT radiation. Even if you have a CT test, even if you can’t have a baby right away, you can put pregnancy preparation on the agenda first. For example, start taking folic acid in the prescribed amount 3 months before conception to prevent neurological malformations in the brain of your child, or strengthen physical exercise, regulate your diet, and fully improve your preconception checkups to make all preparations for a smoother pregnancy. MRI is safe during pregnancy and can be replaced by MRI in the vast majority of cases when CT examinations are needed during pregnancy.