Magnetic Resonance Safety Expert (MRSE) – 2025 Exam
Questions and Answers | Updated Certification | A+
GRADED | 100% Verified
Formula for temperature change in a patient - ANSWER dTp/dt = SAR/C, where C = 4186 J/kg, Tp
= temperature
How much does liquid helium expand when transitioning to gaseous helium? - ANSWER >700x
Electric field density (JE) formula - ANSWER JE = Conductivity x electric field strength x B0 x V
where V = velocity?
What is the most accurate way to measure energy dose to the patient? - ANSWER B1 + rms
Kinetic stability - ANSWER The rate at which a gadolinium agent dissociates
Thermodynamic stability - ANSWER the change that a gadolinium agent will transmetallate
Diamagnetic - ANSWER Very small negative magnetic susceptibility (X), two electrons in an
orbital
Paramagnetic - ANSWER Very small positive magnetic susceptibility (X), one electron in an
orbital
Ferromagnetic - 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 - ANSWER Power = Flip Angle ^2 x (Tp / Tr) where Tp = pulse
duration, Tr =
Slew rate formula - ANSWER Maximum Gradient Strength (mT/m) / Rise Time (ms)
What parameters can be changed to reduce Peripheral Nerve Stimulation (PNS)? - 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) - ANSWER paramagnetic
What quantitative property of the gradient coils is responsible for Peripheral Nerve Stimulation
(PNS)? - ANSWER slew rate
What contrast agents are the most stable? - ANSWER macrocyclic, ionic
What is a common dose of gadolinium? - ANSWER 0.1 mmol/kg
In what direction relative to the magnetic flux will the strongest Lenz's force be produced? -
ANSWER antiparallel
What is the ASTM duration of time defined for heating effects? - ANSWER 15 mins continuous
scanning
Where is translational force at a maximum? - ANSWER edge of bore
, Where is translational force at a minimum? - ANSWER isocenter
Where is rotational force at a maximum? - ANSWER isocenter
Where are gradient fields at their maximum? - ANSWER inner periphery of bore
Do gradient fields extend outside the bore? - ANSWER yes
Do RF fields extend outside the bore? - ANSWER no
What kind of stainless steel is NOT ferritic? - ANSWER 316L austenitic stainless steel
Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - ANSWER ferromagnetic
MP35N alloy is (ferrous/not ferrous) - ANSWER not ferrous
How much risk does a temporary epicardial pacing wire pose? - ANSWER minimal risk because
the wires are usually not ferrous and have a very short length that will not create much heating
What is the minimum type and amount of padding to reduce a proximity or loop burn? -
ANSWER 1 cm foam pad (thick enough, not impacted by sweat)
In which zones will a patient change for a fixed and mobile MRI? - ANSWER fixed: Zone 2.
mobile: Zone 3
Who is allowed to bring a patient into zone 4? - ANSWER Only level 2 MR personnel
Questions and Answers | Updated Certification | A+
GRADED | 100% Verified
Formula for temperature change in a patient - ANSWER dTp/dt = SAR/C, where C = 4186 J/kg, Tp
= temperature
How much does liquid helium expand when transitioning to gaseous helium? - ANSWER >700x
Electric field density (JE) formula - ANSWER JE = Conductivity x electric field strength x B0 x V
where V = velocity?
What is the most accurate way to measure energy dose to the patient? - ANSWER B1 + rms
Kinetic stability - ANSWER The rate at which a gadolinium agent dissociates
Thermodynamic stability - ANSWER the change that a gadolinium agent will transmetallate
Diamagnetic - ANSWER Very small negative magnetic susceptibility (X), two electrons in an
orbital
Paramagnetic - ANSWER Very small positive magnetic susceptibility (X), one electron in an
orbital
Ferromagnetic - 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 - ANSWER Power = Flip Angle ^2 x (Tp / Tr) where Tp = pulse
duration, Tr =
Slew rate formula - ANSWER Maximum Gradient Strength (mT/m) / Rise Time (ms)
What parameters can be changed to reduce Peripheral Nerve Stimulation (PNS)? - 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) - ANSWER paramagnetic
What quantitative property of the gradient coils is responsible for Peripheral Nerve Stimulation
(PNS)? - ANSWER slew rate
What contrast agents are the most stable? - ANSWER macrocyclic, ionic
What is a common dose of gadolinium? - ANSWER 0.1 mmol/kg
In what direction relative to the magnetic flux will the strongest Lenz's force be produced? -
ANSWER antiparallel
What is the ASTM duration of time defined for heating effects? - ANSWER 15 mins continuous
scanning
Where is translational force at a maximum? - ANSWER edge of bore
, Where is translational force at a minimum? - ANSWER isocenter
Where is rotational force at a maximum? - ANSWER isocenter
Where are gradient fields at their maximum? - ANSWER inner periphery of bore
Do gradient fields extend outside the bore? - ANSWER yes
Do RF fields extend outside the bore? - ANSWER no
What kind of stainless steel is NOT ferritic? - ANSWER 316L austenitic stainless steel
Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - ANSWER ferromagnetic
MP35N alloy is (ferrous/not ferrous) - ANSWER not ferrous
How much risk does a temporary epicardial pacing wire pose? - ANSWER minimal risk because
the wires are usually not ferrous and have a very short length that will not create much heating
What is the minimum type and amount of padding to reduce a proximity or loop burn? -
ANSWER 1 cm foam pad (thick enough, not impacted by sweat)
In which zones will a patient change for a fixed and mobile MRI? - ANSWER fixed: Zone 2.
mobile: Zone 3
Who is allowed to bring a patient into zone 4? - ANSWER Only level 2 MR personnel
