Many techniques in medical imaging have found wide application in the scientific research industry. The development of medical imaging has benefited from the rapid development of modern computer technology. Its combination with image processing, computer vision and pattern recognition technology has given rise to a new branch of computer technology -- medical image processing. The origin and development of chest orthographic film: in 1895, the German physicist Roentgen discovered X-ray, which was soon used for the disease examination of the human body, and thus formed the radiology. In the past 30 years, CT, MRI, ultrasound and radionuclide imaging equipment have been constantly improved and improved, and examination technology and nuclear methods have also been constantly innovated. Imaging diagnosis has developed from a single diagnosis based on morphological changes into a comprehensive diagnostic system integrating morphological, functional and metabolic changes. At the same time, some new technologies such as magnetic imaging of the heart and brain and new disciplines such as molecular imaging continue to emerge, and the scope of diagnostic imaging is still developing and expanding.