Magnet Quench

There's no reason to panic ...


But a superconducting magnet quench is not something to take lightly. (Most magnets above 0.5 Tesla are superconducting.)

You should have evacuation procedures ready just in case it ever happens in your facility. That’s because you’d have to evacuate everyone from the magnet room – patient and personnel alike – to avoid asphyxiation and frostbite concerns. While quenches are rare, you would receive ample warning: a loud noise, a warning message, or a tilted image.

Quench with Vent Failure Hazards

Magnet quenches are indicated by a loud noise, warning message or the tilting of an image on the image screen. A magnet quench can result in the release of cryogen vapor into the scan room if the vent fails; white clouds of vapor appear in the scan room. Cryogens during a quench can cause asphyxiation, frostbite, or injuries due to panic.




In case of a sudden cryogen release into the scan room:

  • Do not panic.
  • Using the intercom, ask the patients to stay calm and remain on the table. Tell them that someone will be in shortly to offer assistance.
  • Turn on the scan room exhaust fan. (Some systems vent automatically and there is no fan to turn on.)
  • Prop opens the door between the magnet room and hallway. If the door cannot be opened break the window to the scan room to relieve pressure.
  • Enter the room and undock the table, and help the patient exit the scan room.
  • Evacuate all personnel from the area until the air is restored to normal.






If you ever have a concern regarding the MR Environment, consult your MR Technologist.