Development of high magnetic field magnet technologies for the magnetic resonance medical imaging

The high-field superconducting magnets as a core components of the MRI has been widely used in the fields of medical equipment. The superconducting magnet technology depends on the development of superconducting material properties and cryogenic technology. Compared with conventional imaging equipment, ultra-high-field magnetic resonance imaging technology has unparalleled advantages of the improvement for medical imaging equipment. At present, the magnetic field of ultra-high-field superconducting magnet is 9.4-11.75 T for the human body. For animals, the maximum magnetic field has reached 17 T. Large scale application of superconducting technology has become the only way to be able to form high-field magnet scale industrialization. In this paper, a review on the development of high field MRI system will be presented including in the superconducting and permanent MRI systems for all kind of the applications in the medical diagnosis and interventional therapy with solenoid and open structures.