Emergency Magnet off (Quench)

What is an MRI "quench"?. A routine software update that requires the magnet to be restarted. The rapid boil-off of liquid helium leading to the collapse of the magnetic field. The process of turning off the electrical power to the computer console. A safety feature that only activates when the room temperature rises above 75°F.

Why is liquid helium used in a superconductive MRI magnet?. To act as a lubricant for the moving parts inside the scanner. To keep the magnet coils at an extremely low temperature so they lose all electrical resistance. To provide the primary power source for the radiofrequency coils. To prevent the patient from feeling vibrations during the scan.

Which of the following is the ONLY scenario where a quench should be manually initiated?. The MRI technologist needs to leave the building for an emergency. A patient is experiencing severe anxiety or claustrophobia. A person is pinned or impaled by a metallic object and is in a life-threatening situation. There is a minor software error that prevents the table from moving.

What physically triggers the magnetic field to disappear during a manual quench?. A physical brake is applied to the magnet's core. An internal heater is activated to warm a small part of the coil, causing the helium to boil. The electricity from the wall is reversed to pull the magnet in the opposite direction. The liquid helium is sucked out of the magnet by a vacuum pump.

Approximately how much does a facility cost to recover from a single quench?. $500 - $1,000. $5,000 - $10,000. $40,000 - $60,000+. There is no cost; it is covered by the manufacturer's warranty.

If a quench occurs and the helium vent pipes fail, what is the primary life-threatening risk?. Electrical shock from the magnet's housing. Exposure to high levels of X-ray radiation. Asphyxiation due to helium gas displacing the oxygen in the room. Hearing loss from the sound of the gas escaping.

What is a "spontaneous quench"?. A quench that the staff schedules during the night to save money. An accidental field collapse caused by technical failures, like ice blockage or low helium levels. An accidental field collapse caused by technical failures, like ice blockage or low helium levels. A quench triggered by the patient pressing the call bell.

Does the "Emergency Power Off" (EPO) button trigger a quench?. Yes, the EPO and the Quench button perform the same function. No, the EPO only cuts electrical power to the room; the magnet remains active. Only if the scanner is currently in the middle of a sequence. Only if the scanner is currently in the middle of a sequence.

What is a "planned quench" used for?. To test if the emergency buttons are working once a year. To safely discharge the magnetic field when a magnet is being decommissioned or relocated. To clear the "ghosting" artifacts from the previous day's scans. To reduce the magnet's strength for a pediatric patient.

Because helium is lighter than air, where will the most breathable oxygen be located if gas leaks into the MRI room?. Near the ceiling. Directly inside the scanner bore. Near the floor. Near the magnetic warning signs on the door.