Chapter 2: Safety Information and Alerts
64 MRIdian® system L-0009 Release 4.5 ViewRay Inc.
2.23.2 Emergency Quench Procedure
1. Push the Magnet Emergency Discharge Button
There will be loud sounds (hissing, gurgling) as the helium boils off. The
magnetic field will decrease to a negligible level within 60 seconds.
2.
Rescue the patient, or, whomever has been trapped by an object and the
force of the magnetic field.
3. Stay out from under the quench vent.
The liquid helium boils off during a quench and condensation will occur on the
quench vent pipe and can drip down and cause frostbite.
4.
Leave the scan room.
The helium is vented outside through the quench vent during a quench.
However, it is possible for helium to escape and fill the room causing oxygen
displacement and the danger of asphyxiation.
5. Call ViewRay Service. It is
important to service a quenched magnet immediately.
Condensation of air oxygen occurs during the escape of ultra cold helium gas and increases
the ri
sk of fire. Make sure there is no smoking or use of equipment that discharges electrical
sp
arks or fire.
Even though the magnet decreases to a negligible level within 60 seconds
after pressing the MAGNET EMERGENCY DISCHARGE BUTTON, it will take five
minut
es for the magnetic field to be completely extinguished.
2.23.3 Rescuing the Patient in an Emergency
IF COUCH MOVEMENT IS CREATING THE EMERGENCY SITUATION
1. Press the E-Stop to stop all couch movement.
2. Rescue the patient.
After the emergency, the E-Stop must be reset. Pull the E-Stop button up to reset.
IF THE PATIENT IS HAVING AN EMERGENCY MEDICAL SITUATION AND YOU MUST REMOVE
THE
PATIENT FROM THE BORE
Press the HOME button on the couch control panel. The couch will automatically withdraw
fr
om the bore.
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