MAGNETIC RESONANCE SAFETY
EXPERT (MRSE) PRACTICE EXAM
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. Which physical principle explains why a patient might experience vertigo when moving
rapidly into a high-field MR scanner?
A. Faraday’s Law of Induction
B. Lorentz Force on the vestibular system
C. The Magnetohydrodynamic Effect
D. Lenz’s Law
Answer: B
Conceptual Explanation: Lorentz forces act on the endolymph in the inner ear when
moving through a static magnetic field, creating a sensation of motion or vertigo.
2. The Spatial Field Gradient (SFG) is most critical for determining which risk to a
ferromagnetic object?
A. Rotational torque
B. Peripheral nerve stimulation
C. Radiofrequency heating
,D. Translational attraction force
Answer: D
Conceptual Explanation: The translational force (missile effect) is proportional to the
product of the static field and the spatial field gradient (B0 * dB/dx).
3. According to IEC 60601-2-33, what is the whole-body SAR limit for the ‘First Level
Controlled Operating Mode’?
A. 4.0 W/kg
B. 2.0 W/kg
C. 8.0 W/kg
D. 12.0 W/kg
Answer: A
Conceptual Explanation: The Normal Operating Mode limit is 2.0 W/kg, while the First
Level Controlled Operating Mode allows up to 4.0 W/kg.
4. Which labeling category indicates an item that has been demonstrated to pose no known
hazards in all MR environments?
A. MR Conditional
B. MR Unsafe
C. MR Safe
D. MR Neutral
, Answer: C
Conceptual Explanation: MR Safe items are non-conducting, non-metallic, and non-
paramagnetic, posing no hazards in any MR environment.
5. A ‘Quench’ refers to which of the following events?
A. The sudden loss of superconductivity and rapid boil-off of cryogens
B. The emergency shutdown of the electrical power to the RF cabinets
C. The activation of the emergency stop button for the patient table
D. The calibration process for the gradient coils
Answer: A
Conceptual Explanation: A quench is the process where the superconducting coils
become resistive, causing the liquid helium to rapidly expand into gas and exit the system.
6. Which factor is NOT typically a condition listed for an ‘MR Conditional’ implant?
A. Static magnetic field strength (e.g., 1.5T or 3T)
B. Maximum spatial field gradient
C. The patient’s body mass index (BMI)
D. Maximum SAR or B1+rms limits
Answer: C
EXPERT (MRSE) PRACTICE EXAM
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. Which physical principle explains why a patient might experience vertigo when moving
rapidly into a high-field MR scanner?
A. Faraday’s Law of Induction
B. Lorentz Force on the vestibular system
C. The Magnetohydrodynamic Effect
D. Lenz’s Law
Answer: B
Conceptual Explanation: Lorentz forces act on the endolymph in the inner ear when
moving through a static magnetic field, creating a sensation of motion or vertigo.
2. The Spatial Field Gradient (SFG) is most critical for determining which risk to a
ferromagnetic object?
A. Rotational torque
B. Peripheral nerve stimulation
C. Radiofrequency heating
,D. Translational attraction force
Answer: D
Conceptual Explanation: The translational force (missile effect) is proportional to the
product of the static field and the spatial field gradient (B0 * dB/dx).
3. According to IEC 60601-2-33, what is the whole-body SAR limit for the ‘First Level
Controlled Operating Mode’?
A. 4.0 W/kg
B. 2.0 W/kg
C. 8.0 W/kg
D. 12.0 W/kg
Answer: A
Conceptual Explanation: The Normal Operating Mode limit is 2.0 W/kg, while the First
Level Controlled Operating Mode allows up to 4.0 W/kg.
4. Which labeling category indicates an item that has been demonstrated to pose no known
hazards in all MR environments?
A. MR Conditional
B. MR Unsafe
C. MR Safe
D. MR Neutral
, Answer: C
Conceptual Explanation: MR Safe items are non-conducting, non-metallic, and non-
paramagnetic, posing no hazards in any MR environment.
5. A ‘Quench’ refers to which of the following events?
A. The sudden loss of superconductivity and rapid boil-off of cryogens
B. The emergency shutdown of the electrical power to the RF cabinets
C. The activation of the emergency stop button for the patient table
D. The calibration process for the gradient coils
Answer: A
Conceptual Explanation: A quench is the process where the superconducting coils
become resistive, causing the liquid helium to rapidly expand into gas and exit the system.
6. Which factor is NOT typically a condition listed for an ‘MR Conditional’ implant?
A. Static magnetic field strength (e.g., 1.5T or 3T)
B. Maximum spatial field gradient
C. The patient’s body mass index (BMI)
D. Maximum SAR or B1+rms limits
Answer: C
