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MRSO PREP EXAM WITH {212} QUESTIONS WITH 100% VERIFIED ANSWERS
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MRSO PREP EXAM WITH {212} QUESTIONSWITH 100% VERIFIED ANSWERS 2024-2025
The Zero Boil-Off ANSWER System lowers or eliminates the need to replenish
Helium in a magnet.
Quench - ANSWER: Quickly eliminate the magnetic field.
Not immediately; it takes 3 to 5 minutes to totally dissipate the magnetic field.
Loud noise as Helium flows out of the Quench Vent.
Can cause a crack in the wire (extremely expensive to repair/replace).
Ohm's Law - ANSWER Resistance is voltage divided by amperage in a wire.
V=IR
Cryogen reduces/eliminates heating with high voltage and amperage, allowing for a
large magnetic field.
Cryogen - Answer: Liquid Helium
42* Kelvin.
Dual Cryogen System - Answer: Helium
,Nitrogen (used to keep Helium cool as a backup)
Quench Vent - ANSWER: Used to vent boiling Helium to the outside.
The MRI manufacturer/engineer is responsible for inspecting the quench vent in the
MRI room (Zone IV).
The exterior quench vent is Zone III (inspected by the facility).
Quench your concerns about a malfunctioning Quench Vent. - ANSWER There is a
dense fog in the room.
Rain and snow can contain oxygen, which poses a fire risk.
Lowered room temperature causes hypothermia/frostbite.
Asphyxiation
Eardrums ruptured due to increased pressure in the room.
Difficulty opening the entrance to Zone III owing to increased pressure. It may be
necessary to break a window to relieve pressure.
Magnets do not instantaneously lose their magnetic field.
Peripheral nerve stimulation is caused by a magnetic field change.
,Static Magnetic Field Concerns - ANSWER Translation/Rotational Force
*No detrimental effects on patients or fetuses have been reported for those exposed
to up to 8T.
Static Magnetic Field Occupational Exposure Limits: ICNIRP
- The head and trunk are confined to magnetic flux.
The density of 2 T
- Limits apply to a magnetic flux density of
8T
IEC
- The head and trunk are confined to magnetic flux.
Density of 4 T.
- Limbs have a maximum magnetic flux density of
4T.
Static Magnetic Field General Public Exposure Limits - Answer: 400mT
FDA Limits for Static Magnetic Field - Answer: <1 month old - 4T.
> 1-month-old – 8T
, Exposure to a static magnetic field greater than 4T requires clearance.
Concerns about Time Varying Gradient Fields - ANSWER Faraday's Law principle
leads to electrical induction.
Cardiac Fibrillation (unreported).
Diaphragm spasm causes difficulty breathing.
Brain
Peripheral Nerve Stimulation is limited to the patient's comfort.
Time-Varying Gradient Field Normal Operating Mode Limits - Answer IEC/FDA
Normal Operating Mode.
- 80 per cent of the maximum dB/dt exposure.
= +1.0 * rb(1 + 0.36 / Teff)
Time-Varying Gradient Field First Level Mode Limits - Answer IEC/FDA.
100 per cent of the maximum dB/dt.
= 0.8 * rb(1 + 0.36 / Teff)
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