After a man has a CT, he needs to choose the time to prepare for pregnancy according to the specific circumstances of the examination, and there are large individual differences that cannot be generalized. CT examination is a common clinical examination, the amount of radiation is low, and the impact on the body is not particularly obvious. If it is just an ordinary examination, no matter which part of the body, the examination time is short and the amount of radiation received is also very low, it will not affect the fertility function in general, and you can prepare for pregnancy after a month of rest and several times of sperm discharge, which varies from person to person. If CT examinations are performed several times in a short period of time or for a long period of time, it is recommended to rest for 1-3 months after the examination before preparing for pregnancy, and to pay attention to the protection of local lead clothing during the examination to avoid deformed children due to radiation. If the individual is psychologically stressed, it is appropriate to extend the time for another 1-2 months. After the CT examination, it is recommended to drink more water and eat more vegetables and fruits to speed up the recovery of the body. Semen examination is required before preparing for pregnancy to clarify the quality of sperm and to ensure smooth fertility.