The superconducting magnet system is divided into two types: traditional cylindrical superconducting magnets and open superconducting magnets. Traditional superconducting magnets are mainly divided into two grades based on field strength: 1.5T and 3.0T. Among them, 1.5T is the mainstream magnet, and the use of 3.0T magnets is increasing year by year. There are mainly two types of field strengths for open superconducting Euros: 1.0T and 1.2T. The superconducting magnet system is also composed of a main magnetic field generating unit, a shimming unit, and a refrigeration unit. The main magnetic field generating unit is composed of a superconducting main coil and a superconducting magnetic shielding coil, the shimming unit is composed of a superconducting shimming coil or a passive shimming patch, and the refrigeration unit includes a dewar, a cold screen, and a cold head.

This is a relatively early structural feature of magnetic resonance superconducting magnets. After more than a decade of development, the coil and overall structure of the magnet have undergone significant changes. The coil design has become increasingly compact, allowing the total length of the magnet to become shorter and shorter. This can improve the comfort of patients during scanning and reduce the likelihood of patients experiencing claustrophobia. At the same time, it also significantly reduces the cost of magnets, which can promote a decrease in the overall price of resonance equipment and make the application of magnetic resonance more widespread. The use of liquid helium as the primary cooling layer for magnetic resonance superconducting magnetic levitation is no longer used. The international mainstream zero evaporation superconducting magnet only has an external vacuum layer, a thermal assisted radiation shielding layer, a liquid helium container, and then the main coil and coil skeleton from the outside to the inside. The thermal radiation screen is cooled by a 4K cold head in the first stage, and the liquid nitrogen tank is cooled by a cold head in the second stage. The system no longer needs to be regularly filled with liquid helium when used in hospitals, greatly saving the operating costs of magnetic resonance equipment.