MRSO - Emergent Situations and Patient Considerations - Module 8 2024/2025 verified/passed

MRSO - Emergent Situations and Patient Considerations - Module 8Quench - correct answer -to extinguish -means the magnetic field is removed Liquid helium - correct answer -helium is not stable as a liquid. in order to maintain a liquid state, it must stay at 4K (-452.4F) -in order to maintain the temperature, must be vacuum sealed. if vacuum is removed, temperature within the cryostat would rise -helium will boil at 4.2K (-452.11F) -liquid helium boils/expands at ratio of 1:750 to become helium gas -gas escapes through quench pipes and ductwork to outside the facility In event of manual quench: - correct answer -Remove all personnel from zone IV -Complete removal of field may take several minutes. no ferrous items into room until level 2 personnel determine field has been removed -review quench policies and procedures with mr personnel annually In event of a spontaneous quench: - correct answer -all persons immediately evacuated from zone IV, preferably to zone II -MR personnel secure the area until determined the field is no longer present Some scan rooms have - correct answer secondary passive ventilation system (in the event the primary system were to fail) If primary ventilation system fails - correct answer -all of the gas will escape into the scan room -asphyxiation would be possible