CT and X-ray examinations are the same, it is radiographic imaging, CT and X-ray imaging, the principle is the same, it is the damage to the human body is ionizing radiation, but now also do a lot of protective measures, the unnecessary part are done to protect. At the same time, the inherent protection of CT and X-rays is very good, so you do not need to be particularly frightened when examining. Nowadays, there is a lot of panic about X-rays and CT examinations, and people feel that they have to go for MRI, which is not necessary. The damage to the human body from routine CT examinations is divided into two parts: the first one is the damage to the human body from ionizing radiation; the second one is the enhanced examination, one of the elements of CT examinations is the enhanced examination, and the damage to the human body from its contrast agent, mainly iodine allergy. For normal people, if there is no iodine allergy, a few hours to return to normal, the body can be excreted through the urinary system, the biliary system, it. In patients with renal impairment, permanent damage may be caused.