X-ray examination techniques mainly include general X-ray examination techniques, including fluoroscopy, photography, special imaging, and contrast examination. Fluoroscopy is an economical and simple common examination method, which can observe the morphology and dynamics of organs at the same time and obtain the examination results immediately, which is irreplaceable by other X-ray examinations. However, it also has the disadvantage of not showing the image details clearly enough and not leaving a permanent record. Plain radiography is also a commonly used examination method, commonly known as plain radiography. The main advantages are that the spatial resolution of the photograph is high, the image is clear, the photograph can be stored for a long time, the permanent record facilitates review and comparison and consultation, and the patient receives less X-ray dose. The disadvantage is that a picture is only a momentary image, which makes it difficult to understand the dynamic changes of the organ. Special imaging is different from ordinary X-ray examination, commonly used are body layer photography, soft X-ray photography. Body layer photography is abbreviated as CT, and CT examinations are routinely performed using cross-sectional level scans, and commonly used examination techniques include CT flat scan, enhanced scan, and contrast CT examination. The choice of scanning method depends on the examination site and the purpose of the examination. Cranial, cephalic, cervical, thoracic, abdominal, pelvic, spine and spinal joints can be used for CT examinations. Soft radiography refers to the tube voltage below 40 kV. The X-rays produced by it are commonly called soft radiography because of its longer wavelength, lower energy and weaker ability to penetrate substances, and the use of such radiography is called soft radiography. Soft radiography is used for mammography, which is a mammogram. A contrast examination is an image created by introducing a contrast agent into or around an organ to create an artificial difference in density. Contrast examinations obviously expand the scope of X-ray examinations, and the introduction of either positive or negative contrast agents into the body may sometimes result in adverse reactions. Therefore, full attention must be paid.