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MRSE Exam Questions and Answers | Latest Update

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Formula for temperature change in a patient -:- dTp/dt = SAR/C, where C = 4186 J/kg, Tp = temperature How much does liquid helium expand when transitioning to gaseous helium? -:- >700x Electric field density (JE) formula -:- JE = Conductivity x electric field strength x B0 x V where V = ...

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  • September 13, 2024
  • 40
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MRSE
  • MRSE
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2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!




MRSE Exam Questions and Answers |
Latest Update
Formula for temperature change in a patient

✓ -:- dTp/dt = SAR/C, where C = 4186 J/kg, Tp = temperature




How much does liquid helium expand when transitioning to gaseous helium?

✓ -:- >700x




Electric field density (JE) formula

✓ -:- 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?

✓ -:- B1 + rms




Kinetic stability

✓ -:- The rate at which a gadolinium agent dissociates




Thermodynamic stability

✓ -:- the change that a gadolinium agent will transmetallate




1|P a g e | G r a d e A + | 2 0 2 0 2 5

,2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!


Diamagnetic

✓ -:- Very small negative magnetic susceptibility (X), two electrons in an orbital




Paramagnetic

✓ -:- Very small positive magnetic susceptibility (X), one electron in an orbital




Ferromagnetic

✓ -:- 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

✓ -:- Power = Flip Angle ^2 x (Tp / Tr) where Tp = pulse duration, Tr =




Slew rate formula

✓ -:- Maximum Gradient Strength (mT/m) / Rise Time (ms)




What parameters can be changed to reduce Peripheral Nerve Stimulation (PNS)?




2|P a g e | G r a d e A + | 2 0 2 0 2 5

,2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!


✓ -:- 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)

✓ -:- paramagnetic




What quantitative property of the gradient coils is responsible for Peripheral Nerve

Stimulation (PNS)?

✓ -:- slew rate




What contrast agents are the most stable?

✓ -:- macrocyclic, ionic




What is a common dose of gadolinium?

✓ -:- 0.1 mmol/kg




In what direction relative to the magnetic flux will the strongest Lenz's force be produced?

✓ -:- antiparallel




What is the ASTM duration of time defined for heating effects?

3|P a g e | G r a d e A + | 2 0 2 0 2 5

, 2024 /2025 | © copyright | This work may not be copied for profit gain | Excel!


✓ -:- 15 mins continuous scanning




Where is translational force at a maximum?

✓ -:- edge of bore




Where is translational force at a minimum?

✓ -:- isocenter




Where is rotational force at a maximum?

✓ -:- isocenter




Where are gradient fields at their maximum?

✓ -:- inner periphery of bore




Do gradient fields extend outside the bore?

✓ -:- yes




Do RF fields extend outside the bore?

✓ -:- no




What kind of stainless steel is NOT ferritic?


4|P a g e | G r a d e A + | 2 0 2 0 2 5

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