Magnetic Resonance Safety Expert (MRSE) –Exam Questions and Answers | Updated Certification
Question : Formula for temperature change in a patient
CORRECT ANSWER : dTp/dt = SAR/C, where C = 4186
J/kg, Tp = temperature
Question : How much does liquid helium expand when
transitioning to gaseous helium?
CORRECT ANSWER : >700x
Question : Electric field density (JE) formula
CORRECT ANSWER: JE = Conductivity x electric field
strength x B0 x V where V = velocity?
Question : What is the most accurate way to measure energy
dose to the patient?
CORRECT ANSWER : B1 + rms
Question : Kinetic stability
CORRECT ANSWER : The rate at which a gadolinium
agent dissociates
Question : Thermodynamic stability
CORRECT ANSWER : the change that a gadolinium agent
will transmetallate
Question : Diamagnetic
CORRECT ANSWER : Very small negative magnetic
susceptibility (X), two electrons in an orbital
Question : Paramagnetic
CORRECT ANSWER : Very small positive magnetic
susceptibility (X), one electron in an orbital
Question : 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
Question : RF Pulse power (heating) formula
CORRECT ANSWER : Power = Flip Angle ^2 x (Tp / Tr)
where Tp = pulse duration, Tr =
Question : Slew rate formula
CORRECT ANSWER : Maximum Gradient Strength
(mT/m) / Rise Time (ms)
Question : 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
Question : Nitinol is (paramagnetic/diamagnet/ferromagnetic)
CORRECT ANSW ER: paramagnetic
Question : What quantitative property of the gradient coils is
responsible for Peripheral Nerve Stimulation (PNS)?
CORRECT ANSWER : slew rate
Question : What contrast agents are the most stable?
CORRECT ANSWER : macrocyclic, ionic
Question : What is a common dose of gadolinium?
CORRECT ANSWER : 0.1 mmol/kg
Question : In what direction relative to the magnetic flux will
the strongest Lenz's force be produced?
CORRECT ANSWER : antiparallel
Question : What is the ASTM duration of time defined for
heating effects?