Quenching

Quenching refers to rapid expulsion of the liquid cryogen used to maintain the MR magnet in a superconducting state.

Modern MRI scanners contain superconducting magnets which have very low energy consumption, made possible by maintaining internal subzero temperatures by way of a 'cryogen bath' of liquid helium. In the event that somebody pushes the emergency stop button or there is an equipment fault, the liquid helium boils off rapidly accompanied by a loud banging or hissing sound, safely expelled from the building by means of a dedicated venting system.

Extremely rare but if for some reason the gas should escape into the room instead of being vented outside the building, there is a risk of asphyxiation and frost bite.

MRI physics
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rID: 16524
Section: Physics
Synonyms or Alternate Spellings:

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