Which type of magnet is most commonly used in MRI?

The most commonly used type of magnet in MRI is superconductive. Superconductive magnets operate at very low temperatures, which enable them to conduct electricity with zero resistance. This characteristic allows them to generate powerful magnetic fields, typically in the range of 1.5 to 3.0 Tesla, which are essential for high-quality imaging in MRI.

Because of their ability to maintain a strong and stable magnetic field over extended periods, superconductive magnets are ideal for clinical MRI applications. They require a cryogenic cooling system, usually involving liquid helium, to maintain their superconducting state. This results in highly efficient, energy-effective operation compared to other magnet types.

While permanent magnets can be used for MRI systems, they do not achieve the same level of magnetic field strength as superconductive magnets, which limits their effectiveness in producing detailed images. Resistive magnets are less common for clinical use since they require continuous power to maintain the magnetic field, making them less efficient compared to superconductive systems. Electromagnetic magnets are also not typically used in MRI due to similar limitations in sustaining high magnetic fields.

Overall, the reliance on superconductive magnets in MRI is directly related to their high strength, efficiency, and capacity to create the high-quality images needed for precise diagnostics.