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An MRI magnet doesn’t produce heat while producing a magnetic field. That’s not why they are cooled. They are superconductors, the resistance is 0.
by catblast 7y ago
An MRI magnet doesn’t produce heat while producing a magnetic field. That’s not why they are cooled. They are superconductors, the resistance is 0.
- duskwuff 7y ago> They are superconductors, the resistance is 0. So long as they stay under their critical temperature. If that changes… well, a lot of liquid helium is about to stop being liquid. And that's one of the reasons why a permanent-magnet MRI is so interesting -- it doesn't depend on a constant supply of power (for the helium cooler) and gaseous helium (to replace lost gas), so the system is portable, and maintenance costs are likely to be much lower.