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MRSO PREP Questions & 100% Correct Answers
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Exposure to Static Magnetic Field of >4T - Answer Requires approval. Time Varying Gradient Field Concerns - Answer Electrical induction due to principle of Faraday's Law. Cardiac Fibrilation (not reported). Diaphragm Spasm - cause difficulty breathing.

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  • August 30, 2024
  • 37
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • mrso prep questions 100 correct answers

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  • MRSO
  • MRSO

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MRSO PREP Questions & 100% Correct
Answers
Exposure to Static Magnetic Field of >4T - Answer Requires approval.


Time Varying Gradient Field Concerns - Answer Electrical induction due to principle of
Faraday's Law.


Cardiac Fibrilation (not reported).


Diaphragm Spasm - cause difficulty breathing.


Brain


Peripheral Nerve Stimulation - limited to the comfort of the patient.


Time-Varying Gradient Field Normal Operating Mode Limits - Answer IEC/FDA


Normal Operating Mode
- 80% 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% of the maxiumum dB/dt

,= 0.8 *rb(1+0.36/teff)


Time-Varying Gradient Field Occupational Exposure Limits - Answer ICNRP
- restrictions are limited to 100kHz


IEC
- Limits to peripheral nerve stimulation.


Time-Varying RF Field Concerns - Answer The deposit of Heat (measured in SAR).


Localized Heating to: Eyes, Fetus, & Testicles.


RF Burning.


Time-Varying RF Field Temperature Increase Limits - Answer FDA
- Whole body Exposure <1* Celsius.


Time-Varying RF Field Heating Limits Normal Operating Mode - Answer Increase in core
temperature to 0.5* Celsius


Increase in whole body SAR to less than 2W/kg


Head SAR less than or equal to 3.2 W/kg

,Time-Varying RF Field Heating Limits First Level Mode - Answer Increase in core
temperature to 1* Celsius.


Increase in whole body SAR to less than 4W/kg.


Head SAR less than or equal to 3.2 W/kg.


Time-Varying RF Field Heating Limits Second Level Mode - Answer Increase in core
temperature to greater than 1* Celsius.


Increase in whole body SAR to greater than 4W/kg.


Head SAR less than or equal to greater than 3.2 W/kg.


Localized Transmit-Receive Coil Heating Limits for Normal Mode - Answer FDA/IEC


SAR equal to or less than 10W/kg in the head or trunk (orbits limited to 1* Celsius).


SAR equal to or less than 20W/kg in extremities.


Localized Transmit-Receive Coil Heating Limits for First Level Mode - Answer FDA/IEC


SAR equal to or less than 20W/kg in the head or trunk (orbits limited to 1* Celsius).


SAR equal to or less than 40W/kg in extremities.

, Localized Transmit-Receive Coil Heating Limits for Second Level Mode - Answer FDA/IEC


SAR greater than 20W/kg in the head or trunk (orbits limited to 1* Celsius).


SAR greater than 40W/kg in extremities.


Time-Varying RF Field Occupational Exposure Limits - Answer IEC
- 4W/kg SAR


ICNIRP
- 0.4 W/kg SAR
- 61 V/m
- 0.16 A/m
- 0.2 mT
- 10 W/m^2


Pregnancy Concerns to Static Magnetic Field - Answer No adverse effects noted to date.


Pregnancy Concerns to Time-Varying RF Field - Answer Some affect thave been noted at
heating greater than 39* Celsius


Pregnancy Concerns to Time-Varying Gradient Field - Answer Noise production is a
concern


ICNIRP Pregnancy Concerns - Answer Limit RF heating to < .5* Celcius.

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