First, the correct choice of imaging examination method is needed. We know that there are several medical imaging equipment such as X-ray, B-ultrasound, CT, MRI, ECT and PET-CT, etc. With the development of science and technology, more and more advanced equipment will be born. It is an important issue to choose the right examination that suits your needs. Generally speaking, for cranial and spinal diseases, X-ray plain film should be the preferred examination item; for intracranial and intravertebral diseases such as tumor, brain injury and cerebrovascular accident, CT or MRI should be chosen; for cardiac macrovascular diseases, X-ray examination or echocardiography can be chosen; if the details of cardiac macrovascular diseases are observed, multi-layer spiral CT or digital subtraction angiography should be chosen; for lung and mediastinum, X-ray examination should be used first, followed by CT if necessary. X-ray examination, and then CT or MRI if necessary; intra-abdominal and intrapelvic organs should be more reliable with ultrasound or CT first; bone and joint diseases, X-ray examination is the preferred method; gastrointestinal tract examination, endoscopy or barium angiography are good. Second, before conducting X-ray examination, the examinees should prepare as follows: 1, try to remove clothes, ornaments and auxiliary materials that may affect the examination, mainly metal items, reinforced plastics, Chinese herbal ointment, thicker wool and chemical fiber fabrics, etc. 2.Cooperate with the doctor to try to set up the body position suitable for the examination regulations in order to obtain the best image. 3.The chest and abdomen examination should be controlled by training as ordered by the doctor to avoid blurred images when taking the film. 4.Try to tell the doctor clearly about the condition in order to increase the purpose of the examination and reduce the number of repeated examinations. Patients have the right to refuse unnecessary X-ray examinations (including CT examinations). 5.Prepare for all examinations according to the instructions of the appointment sheet, especially diet control and intestinal preparation. Third, to strengthen personal protection: 1. Prepare for the examination and cooperate actively as requested by the physician. Have the right to ask the examination department to take the necessary protective measures. 2.When the X-ray machine is in working condition, the warning light on the door of the examination room will light up. At this time, waiting patients and other personnel should not open the door to enter the room, and all waiting patients should wait outside the protective door. When other patients are being examined, no one should be onlookers. 3.After the examination, you should leave the examination place in time. 4. Do not use bedside examinations as much as possible if your physical condition permits. Fourth, pregnant women and children are a high-risk group for radiation, try to avoid such examinations. Especially in the first trimester of pregnancy. Because this is a critical period for the formation of important organs of the fetus, X-rays may cause mutations in these cells and tissues that have not yet developed, and the incidence of congenital malformations of the fetus will increase. Women of childbearing age should follow the “ten-day rule”, that is, no X-ray examination within ten days after the onset of menstruation. If you do need to check, you should try to choose a method with low radiation dose and do a good job of protection. For example, a lead apron should be worn on the abdomen of pregnant women and children during chest X-ray examinations.