Citation, DOI, disclosures and article data
At the time the article was created Usman Bashir had no recorded disclosures.View Usman Bashir's current disclosures
Quenching refers to rapid expulsion of the liquid cryogen used to maintain the MRI 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 frostbite.