MRSE Newest updated Exam with precise detailed solutions
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What is the most accurate way to measure energy dose to the patient? - correct
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answer✔✔B1 + rms || ||
Formula for temperature change in a patient - correct answer✔✔dTp/dt = SAR/C, where C
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= 4186 J/kg, Tp = temperature
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How much does liquid helium expand when transitioning to gaseous helium? - correct
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answer✔✔>700x
Electric field density (JE) formula - correct answer✔✔JE = Conductivity x electric field
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strength x B0 x V where V = velocity?
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Kinetic stability - correct answer✔✔The rate at which a gadolinium agent dissociates
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Thermodynamic stability - correct answer✔✔the change that a gadolinium agent will || || || || || || || || || || ||
transmetallate
Diamagnetic - correct answer✔✔Very small negative magnetic susceptibility (X), two
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electrons in an orbital || || ||
Paramagnetic - correct answer✔✔Very small positive magnetic susceptibility (X), one || || || || || || || || || ||
electron in an orbital || || ||
Ferromagnetic - correct answer✔✔very large positive magnetic susceptibility (X), domains || || || || || || || || || ||
of directional magnetism that can align with an external field, retains magnetism after
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being removed from field
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,RF Pulse power (heating) formula - correct answer✔✔Power = Flip Angle ^2 x (Tp / Tr)
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where Tp = pulse duration, Tr =
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Slew rate formula - correct answer✔✔Maximum Gradient Strength (mT/m) / Rise Time
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(ms)
What parameters can be changed to reduce Peripheral Nerve Stimulation (PNS)? - correct
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answer✔✔Increase rise time (reduces slew rate), decrease matrix/phase encoding (reduces || || || || || || || || || ||
slope of gradient), increasing slice thickness (shallower slice selection gradient), increase
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FOV (shallower frequency encoding gradient), phase noise-canceling (opposite frequency to
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noise), increase echo time TE
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Nitinol is (paramagnetic/diamagnet/ferromagnetic) - correct answer✔✔paramagnetic
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What quantitative property of the gradient coils is responsible for Peripheral Nerve
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Stimulation (PNS)? - correct answer✔✔slew rate || || || || ||
What contrast agents are the most stable? - correct answer✔✔macrocyclic, ionic
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What is a common dose of gadolinium? - correct answer✔✔0.1 mmol/kg
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In what direction relative to the magnetic flux will the strongest Lenz's force be produced? -
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correct answer✔✔antiparallel ||
What is the ASTM duration of time defined for heating effects? - correct answer✔✔15 mins
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continuous scanning ||
, Where is translational force at a maximum? - correct answer✔✔edge of bore
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Where is translational force at a minimum? - correct answer✔✔isocenter
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Where is rotational force at a maximum? - correct answer✔✔isocenter
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Where are gradient fields at their maximum? - correct answer✔✔inner periphery of bore
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Do gradient fields extend outside the bore? - correct answer✔✔yes
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Do RF fields extend outside the bore? - correct answer✔✔no
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What kind of stainless steel is NOT ferritic? - correct answer✔✔316L austenitic stainless
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steel
Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - correct answer✔✔ferromagnetic
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MP35N alloy is (ferrous/not ferrous) - correct answer✔✔not ferrous
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How much risk does a temporary epicardial pacing wire pose? - correct answer✔✔minimal
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risk because the wires are usually not ferrous and have a very short length that will not
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create much heating || ||
What is the minimum type and amount of padding to reduce a proximity or loop burn? -
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correct answer✔✔1 cm foam pad (thick enough, not impacted by sweat)
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What is the most accurate way to measure energy dose to the patient? - correct
|| || || || || || || || || || || || || || ||
answer✔✔B1 + rms || ||
Formula for temperature change in a patient - correct answer✔✔dTp/dt = SAR/C, where C
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= 4186 J/kg, Tp = temperature
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How much does liquid helium expand when transitioning to gaseous helium? - correct
|| || || || || || || || || || || || ||
answer✔✔>700x
Electric field density (JE) formula - correct answer✔✔JE = Conductivity x electric field
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strength x B0 x V where V = velocity?
|| || || || || || || ||
Kinetic stability - correct answer✔✔The rate at which a gadolinium agent dissociates
|| || || || || || || || || || ||
Thermodynamic stability - correct answer✔✔the change that a gadolinium agent will || || || || || || || || || || ||
transmetallate
Diamagnetic - correct answer✔✔Very small negative magnetic susceptibility (X), two
|| || || || || || || || || ||
electrons in an orbital || || ||
Paramagnetic - correct answer✔✔Very small positive magnetic susceptibility (X), one || || || || || || || || || ||
electron in an orbital || || ||
Ferromagnetic - correct answer✔✔very large positive magnetic susceptibility (X), domains || || || || || || || || || ||
of directional magnetism that can align with an external field, retains magnetism after
|| || || || || || || || || || || || ||
being removed from field
|| || ||
,RF Pulse power (heating) formula - correct answer✔✔Power = Flip Angle ^2 x (Tp / Tr)
|| || || || || || || || || || || || || || || ||
where Tp = pulse duration, Tr =
|| || || || || ||
Slew rate formula - correct answer✔✔Maximum Gradient Strength (mT/m) / Rise Time
|| || || || || || || || || || || ||
(ms)
What parameters can be changed to reduce Peripheral Nerve Stimulation (PNS)? - correct
|| || || || || || || || || || || || ||
answer✔✔Increase rise time (reduces slew rate), decrease matrix/phase encoding (reduces || || || || || || || || || ||
slope of gradient), increasing slice thickness (shallower slice selection gradient), increase
|| || || || || || || || || || ||
FOV (shallower frequency encoding gradient), phase noise-canceling (opposite frequency to
|| || || || || || || || ||
noise), increase echo time TE
|| || || || ||
Nitinol is (paramagnetic/diamagnet/ferromagnetic) - correct answer✔✔paramagnetic
|| || || || ||
What quantitative property of the gradient coils is responsible for Peripheral Nerve
|| || || || || || || || || || || ||
Stimulation (PNS)? - correct answer✔✔slew rate || || || || ||
What contrast agents are the most stable? - correct answer✔✔macrocyclic, ionic
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What is a common dose of gadolinium? - correct answer✔✔0.1 mmol/kg
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In what direction relative to the magnetic flux will the strongest Lenz's force be produced? -
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correct answer✔✔antiparallel ||
What is the ASTM duration of time defined for heating effects? - correct answer✔✔15 mins
|| || || || || || || || || || || || || || ||
continuous scanning ||
, Where is translational force at a maximum? - correct answer✔✔edge of bore
|| || || || || || || || || || ||
Where is translational force at a minimum? - correct answer✔✔isocenter
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Where is rotational force at a maximum? - correct answer✔✔isocenter
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Where are gradient fields at their maximum? - correct answer✔✔inner periphery of bore
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Do gradient fields extend outside the bore? - correct answer✔✔yes
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Do RF fields extend outside the bore? - correct answer✔✔no
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What kind of stainless steel is NOT ferritic? - correct answer✔✔316L austenitic stainless
|| || || || || || || || || || || || ||
steel
Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - correct answer✔✔ferromagnetic
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MP35N alloy is (ferrous/not ferrous) - correct answer✔✔not ferrous
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How much risk does a temporary epicardial pacing wire pose? - correct answer✔✔minimal
|| || || || || || || || || || || || ||
risk because the wires are usually not ferrous and have a very short length that will not
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create much heating || ||
What is the minimum type and amount of padding to reduce a proximity or loop burn? -
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correct answer✔✔1 cm foam pad (thick enough, not impacted by sweat)
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