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Exam (elaborations)

MRSO PREP TEST 1 QUESTIONS AND ANSWERS

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MRSO PREP TEST 1 QUESTIONS AND ANSWERS

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  • September 24, 2024
  • 202
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
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209 Multiple choice questions

Definition 1 of 209
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.

Faraday's Law Of Induction

Lenz's Force


Coulomb's Law

Ohm's Law

Definition 2 of 209
Involves the autoimmune system.


Histamine produced to increase the permeability of the capillaries.


Mild Reactions: hives, sneezing, itching, swelling.


Severe Reactions: Respiratory Distress, Cardiac Issues, Death.

Ionic Contrast

Allergic Reaction to Gadolinium


Nephrogenic System Fibrosis


Resonant Burns

,Definition 3 of 209
A magnetic field unit of measurement.


10,000 Gauss = 1 Tesla

Bsub0


Sar

Gauss


Tesla

Definition 4 of 209
25cm


Wavelength/2 = maximum temperature increase


1.5T Wavelength 500mm = 50cm


50cm/2= 25cm

Diameter of wire on a 1.5t that affects temperature increase

Thickness of wire on a 1.5t that impacts temperature change

Length of wire on a 1.5T that has potential for maximum temperature increase


Resistance of wire on a 1.5t that influences temperature rise

Definition 5 of 209
IEC & ICNIRP

These organizations develop guidelines for noise pollution in public spaces

These organizations set standards for water quality in residential areas

These agencies manage Waste Disposal In Industrial Zones


These agencies regulates Time-Varying RF Field Occupational Exposure

,Definition 6 of 209
Specific Absorption Rate


Estimated measure of patient heating.


Measured in watts/kg

GAUSS

SAR


TESLA

VECTOR

Definition 7 of 209
ICNIRP


- Head and trunk is limited to a magnetic flux
density of 2T


- Limits are limited to a magnetic flux density of
8T


IEC


- Head and trunk is limited to a magnetic flux
density of 4T.


- Limbs are limited to a magnetic flux density of
4T.

Localized Transmit-Receive Coil Heating Limits for First Level Mode

Iec 60601-2-33 First Level Limits

Static Magnetic Field Occupational Exposure Limits

Time-Varying RF Field Occupational Exposure Limits

, Definition 8 of 209
Noise Reduction Rating


Measured in Decibels


MRI limited to 99dB with hearing protection.

NRR

HAVS

HERTZ

LINEAR

Definition 9 of 209
Test method for measurement of magnetically induced torque on medical devices in the MR
environment.


This describes the static magnetic field on objects that demonstrate ferrous components.

Astm f2182

Astm 2223

ASTM 2213

Golay coil

Definition 10 of 209
A type of contrast that contains a charge when dissolved in a solution (blood) that forms a
stronger bind between the gadolinium ion and the ligand.

Ionic Contrast

Viscosity

Iodinated Agents

Osmolarity

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