Enhanced CT can usually be done 1 to 3 times a year. Enhanced CT refers to CT scanning of suspected lesions after injection of intravenous contrast material, but the exact number of times of enhanced CT needs to be judged according to the condition. Most people can have 1~3 times of enhanced CT examination in a year. Due to the radiation generated by enhanced CT examination, it may have an effect on the organism, and if the organism undergoes enhanced CT examination several times, it may be unfavorable to the organism. How many times a year can we do enhanced CT needs to be judged according to the patient’s condition, and it is recommended that the patient should seek medical treatment in time. In addition, patients need to be observed on the spot for 30 minutes after having an enhanced CT to prevent allergic reactions or other uncomfortable symptoms. Patients should drink more water after having an enhanced CT, which is conducive to promoting the excretion of iodine contrast agent in the body. It is recommended that patients under the guidance of the doctor, according to their own condition reasonable enhancement of CT examination.