MRSO PREP| Questions and Answers, 100% Correct
MRSO PREP| Questions and Answers, 100%
Correct
Zero Boil-Off
System that reduces/eliminates the need to recharge Helium in a magnet.
Quench
Quickly eliminating the magnetic field.
Not immediate, takes 3 to 5 minutes to completely eliminate magnetic field.
Loud Noise as Helium rushes out of Quench Vent.
Can cause crack in the wire (very costly to repair/replace).
Ohm's Law
Resistance that is equal to Voltage divided by the amperage in a wire.
V=IR
Use of Cryogen reduces/eliminates heating with high voltage and amperage which
allows for high magnetic field.
Cryogen
Liquid Helium
42* Kelvin
Dual Cryogen System
Helium
Nitrogen (used to keep Helium cold as back-up)
Quench Vent
Used to vent boiled off Helium to the outside.
Quench Vent in MRI Room is Zone IV (MRI manufacturer/engineer responsible
for inspecting)
Quench Vent outside is Zone III (Facility responsible for inspecting)
Quench concerns with malfunctioning Quench Vent.
Dense fog in room.
Can rain or snow which can contain Oxygen which is a fire risk.
Hypothermia/Frostbite due to lowered room temperature.
Aphyxiation
Ruptured Ear Drums because of increased pressure in room.
Difficulty opening door to Zone III due to increased pressure. May have to break
window to release pressure.
Magnet doesn't immediately lose its magnetic field.
Peripheral Nerve stimulation due to change in magnetic field.
Static Magnetic Field Concerns
Translation/Rotational Force
*No adverse effects to patients or fetus have been noted to individuals exposed to
up to 8T.
Static Magnetic Field Occupational Exposure Limits
ICNIRP
- Head and trunk is limited to a magnetic flux
density of 2T
- Limits are limited to a magnetic flux density of
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