MRI and CT are both commonly used clinical imaging methods and have their own advantages due to different imaging principles. MRI can directly display images of the body in any angle of section as needed, and can obtain good soft tissue contrast without contrast agents, so it is unique in identifying between blood vessels, masses and lymph node structures, and avoiding allergic reactions that may be caused by the use of contrast agents. In addition, there is a wider range of applications for nerve, bone and joint diseases. In contrast, CT scan has the advantage of short examination time, low price, and a wider range of applications, and has absolute advantages for hemorrhagic diseases of the brain and lung diseases.