MRSE Exam WITH CORRECT ANSWERS

MRSE Exam WITH CORRECT ANSWERS |\ |\ |\ |\




What is the most accurate way to measure energy dose
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to the patient? - CORRECT ANSWERS ✔✔B1 + rms
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Formula for temperature change in a patient - CORRECT
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ANSWERS ✔✔dTp/dt = SAR/C, where C = 4186 J/kg, Tp =
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temperature


How much does liquid helium expand when transitioning
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to gaseous helium? - CORRECT ANSWERS ✔✔>700x
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Electric field density (JE) formula - CORRECT ANSWERS
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✔✔JE = Conductivity x electric field strength x B0 x V
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where V = velocity?
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Kinetic stability - CORRECT ANSWERS ✔✔The rate at
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which a gadolinium agent dissociates
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Thermodynamic stability - CORRECT ANSWERS ✔✔the |\ |\ |\ |\ |\ |\



change that a gadolinium agent will transmetallate
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,Diamagnetic - CORRECT ANSWERS ✔✔Very small |\ |\ |\ |\ |\ |\



negative magnetic susceptibility (X), two electrons in an
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orbital


Paramagnetic - CORRECT ANSWERS ✔✔Very small |\ |\ |\ |\ |\ |\



positive magnetic susceptibility (X), one electron in an
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orbital


Ferromagnetic - CORRECT ANSWERS ✔✔very large |\ |\ |\ |\ |\ |\



positive magnetic susceptibility (X), domains of
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directional magnetism that can align with an external
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field, retains magnetism after being removed from field
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RF Pulse power (heating) formula - CORRECT ANSWERS
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✔✔Power = Flip Angle ^2 x (Tp / Tr) where Tp = pulse
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duration, Tr = |\ |\




Slew rate formula - CORRECT ANSWERS ✔✔Maximum
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Gradient Strength (mT/m) / Rise Time (ms)
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What parameters can be changed to reduce Peripheral
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Nerve Stimulation (PNS)? - CORRECT ANSWERS
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✔✔Increase rise time (reduces slew rate), decrease|\ |\ |\ |\ |\ |\ |\



matrix/phase encoding (reduces slope of gradient), |\ |\ |\ |\ |\ |\



increasing slice thickness (shallower slice selection
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gradient), increase FOV (shallower frequency encoding
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,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) -
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CORRECT ANSWERS ✔✔paramagnetic |\ |\




What quantitative property of the gradient coils is
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responsible for Peripheral Nerve Stimulation (PNS)? -
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CORRECT ANSWERS ✔✔slew rate |\ |\ |\




What contrast agents are the most stable? - CORRECT
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ANSWERS ✔✔macrocyclic, ionic |\ |\




What is a common dose of gadolinium? - CORRECT
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ANSWERS ✔✔0.1 mmol/kg |\ |\




In what direction relative to the magnetic flux will the
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strongest Lenz's force be produced? - CORRECT ANSWERS
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✔✔antiparallel
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What is the ASTM duration of time defined for heating
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effects? - CORRECT ANSWERS ✔✔15 mins continuous
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scanning

, Where is translational force at a maximum? - CORRECT
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ANSWERS ✔✔edge of bore |\ |\ |\




Where is translational force at a minimum? - CORRECT
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ANSWERS ✔✔isocenter |\




Where is rotational force at a maximum? - CORRECT
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ANSWERS ✔✔isocenter |\




Where are gradient fields at their maximum? - CORRECT
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ANSWERS ✔✔inner periphery of bore
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Do gradient fields extend outside the bore? - CORRECT
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ANSWERS ✔✔yes |\




Do RF fields extend outside the bore? - CORRECT
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ANSWERS ✔✔no |\




What kind of stainless steel is NOT ferritic? - CORRECT
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ANSWERS ✔✔316L austenitic stainless steel
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Cobalt is (paramagnetic/diamagnetic/ferromagnetic) -
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CORRECT ANSWERS ✔✔ferromagnetic
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