MRI stands for Magnetic Resonance Imaging. 1973, British scholar Lauterbur attached an inhomogeneous magnetic field within the main magnetic field and induced MRI radio waves point by point, and then combined these one-dimensional projection values to obtain a two-dimensional MRI image. 1974 to 1978, physicists at the University of Nottingham and the University of Aberdeen, UK, made great progress in developing MRI systems. On May 28, 1978, they obtained the first MRI image of the human head, and in the second half of 1980, they obtained the first image of the chest and abdomen. By the end of 1982, many hospitals and research institutes around the world had applied this imaging technology to clinical diagnosis and research in other medical fields. It has the unique advantages of no ionizing radiation damage; no bone artifacts; it is the use of a certain frequency of radiofrequency signal in an applied static magnetic field, any plane of the human body, to produce high-quality and multi-parameter imaging, but also to improve the contrast of different tissues, so that it can better display the pathological changes; high soft tissue resolution; no need to use contrast agents to display the vascular structure and other unique advantages. Thus, it has been hailed as another major development in the field of medical imaging after X-rays and CT. MRI is different from CT scan in that CT scan uses the density difference caused by the different attenuation of X-rays passing through each tissue to determine whether it is normal or abnormal. MRI, on the other hand, uses the principle of nuclear magnetic resonance to determine the density difference of moving protons in each tissue. MRI is more advanced than CT, and the images are so clear that it is even known as a living anatomical atlas. In the past, MRI was also called nuclear magnetic resonance, which made people think that this test was related to radioactive elements, but in fact, the test has no radiation and is a relatively safe test. The main drawback at the moment is still that it is expensive, costing hundreds of dollars to do once. A small percentage of tinnitus patients are caused by an auditory neuroma, and although it is only a small percentage, there is no way to detect it without an imaging test, resulting in a misdiagnosis or a missed diagnosis.