CT is the abbreviation of Computer Tomography, which is translated into Chinese as electronic computed tomography. The basic principle of CT imaging is that a relatively uniform beam of X-rays irradiates different tissues and organs in different parts of the body, resulting in different attenuation due to differences in density and thickness, resulting in different amounts of residual X-rays received by the detector through the level, which are converted into electrical signals by photoelectric converters, and then into digital signals by analog/digital converters. This is converted into an electrical signal by the photoelectric converter and then into a digital signal by the analog/digital converter, which is input to a computer to process the corresponding CT images of human tissues and organs in different gray levels. When the human body has a disease, its different density of pathological tissues can also be detected by CT equipment, which is the basic principle that CT can detect lesions. In conclusion, CT is one of the important imaging tools in current clinical practice, showing lesions that are not visible to the naked eye, which can help doctors understand the occurrence and development of diseases and provide great help to clinical diagnosis and treatment.