The radiation dose at the entrance of the CT room is almost zero, there is no radiation dose whatsoever. Because the door of the CT room is closed during the examination, the radiation dose at the entrance is almost zero when measured with professional instruments. The current medical conditions do radiation protection are very in place, will not produce leakage, except sometimes in the examination when the examination room door is not closed, it will produce a certain radiation effect, when the patient is examined when the examination door prompt light will be on, this time try to stay away from the examination room, so as to avoid some radiation.