What cryogen is primarily used in MRI?

The primary cryogen used in MRI systems is helium. Helium is utilized because it remains in a liquid state at extremely low temperatures, which are necessary to cool the superconducting magnets used in MRI machines. Superconducting magnets require optimal cooling to maintain their superconductive state and achieve the strong magnetic fields necessary for high-quality imaging.

The unique properties of helium, such as its low boiling point and non-reactive nature, make it ideal for this application. This allows the MRI equipment to function efficiently and effectively without risk of overheating or electrical resistance in the magnets. The use of helium ensures that the MRI system can produce high-resolution images while maintaining patient safety and equipment reliability.