Quote:
Originally Posted by Don Plumley
1.5T and above MRI's typically use 1G Superconductor wire that is cooled by Liquid Helium (4K) in a cryostat. This is the most common type of MRI installation.
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Yup, that's right. The pic I posted was from an install we were doing. A contractor was working on the sprinkler system. Had the sprinkler lines charged with air and was locating/repairing leaks. He took this bottle into the room and got too close. I took the pic with my phone.
Here's some I took before we ramped down the magnet to remove the bottle. The rope was to keep it from falling to the floor once the field was too weak to hold it up.
Never worked on the .3T systems much but all .7T, 1.5T and 3T use Nitrogen to cool the cryostat during manufacturing till temps are low enough for helium to "pool". Then we add liqiud helium to keep the wire superconductive.