Exam (elaborations)
MRSO PREP TEST 1 QUESTIONS AND ANSWERS
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MRSO PREP TEST 1 QUESTIONS AND ANSWERS
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Name: Score: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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