For head CT, of course, the head can't be covered. X-rays need to be collected by the detector through the human body, and then the images needed for clinical diagnosis are reconstructed by the computer. Of course, it is necessary to cover the abdomen. X-rays are harmful to human body. Although the radiation dose of CT will not have much influence on human body, it is better to treat sexual organs with caution. Therefore, the cover of the abdominal lead coat is mainly to protect the sexual organs. Especially people who have a baby care about this. However, according to the imaging principle of CT, the inside of the frame is exposed as soon as it is turned, so the lead cover is incorrect and should be wrapped around the abdomen. Of course, abdominal CT can't be wrapped in lead clothes. There are many CT patients in domestic hospitals, and radiologists are as busy as a bee. Many hospitals do not take the initiative to protect patients with lead clothes at all, but only take the initiative. Abdominal cover protection is to protect radiation-sensitive organs such as gonads from ionizing damage caused by radiation. If it is only covered, the effect is not as good as the package. The scanning mode of CT is spiral scanning, which protects the upper and lower parts and protects the package better. As discussed by predecessors, scattered radiation is the main way to obtain doses from other non-irradiated parts, but these doses are mainly obtained by internal scattering of human body. Through external scattering, the amount reaching the human body is relatively small. Another consideration is that the leakage of the X-ray tube may cause some radiation. However, the pipe design that passed the safety standards has strict leakage standards. The general leakage will be very small, and it is basically impossible to protect these leaks with ordinary protective clothing, because they are already very high energy. But there is a very big reason for using protective clothing, that is, psychological factors. The patient's fear of radiation, protective clothing certainly plays a very good role in comforting, and at the same time, it will make the patient feel that the hospital is still considering the patient. Therefore, psychologically speaking, it is a win-win result. Therefore, 99% of the head CT abdomen covered with lead clothing is psychological comfort, and 1% is radiation protection. It's like playing an umbrella on a cloudy day. It's not ineffective, it's just not that effective.