MAGNETIC RESONANCE SAFETY
EXPERT (MRSE) COMPREHENSIVE
EXAM QUESTIONS & VERIFIED
ANSWERS 2026/2027 UPDATE
1. According to IEC 60601-2-33, what is the whole-body Specific Absorption Rate (SAR) limit
for the Normal Operating Mode over a 6-minute period?
A. 1.5 W/kg
B. 4.0 W/kg
C. 2.0 W/kg
D. 3.2 W/kg
Answer: C
Conceptual Explanation: The Normal Operating Mode limit for whole-body SAR is 2.0
W/kg. The First Level Controlled Operating Mode allows up to 4.0 W/kg.
2. Which physical phenomenon is responsible for the ‘missile effect’ observed when a
ferromagnetic object is brought near the MR scanner?
A. Lorentz Force
B. Magnetic Torque
C. Lenz’s Law
,D. Translational Force
Answer: D
Conceptual Explanation: The translational force (Fz) is responsible for pulling
ferromagnetic objects into the bore. It is proportional to the product of the magnetic field
and the spatial gradient (B * dB/dz).
3. What is the Specific Absorption Rate (SAR) proportional to regarding the static magnetic
field (B0) strength?
A. Linearly proportional to B0
B. Inversely proportional to B0
C. Proportional to the square of B0
D. Proportional to the square root of B0
Answer: C
Conceptual Explanation: SAR is proportional to the square of the Larmor frequency,
which is linearly related to B0. Therefore, SAR increases with the square of the static
magnetic field strength.
4. The ‘MR Conditional’ label (ASTM F2503) implies that the device:
A. Can be used safely in all MR environments.
B. Requires a physician’s supervision for every use.
C. Is unsafe if B0 is higher than 1.5 Tesla.
, D. Is safe under specific conditions including B0 strength, spatial gradient, and RF limits.
Answer: D
Conceptual Explanation: ‘MR Conditional’ means the item has been demonstrated to pose
no known hazards in a specified MRI environment under specific conditions of use.
5. Peripheral Nerve Stimulation (PNS) is primarily a bioeffect caused by which component of
the MRI system?
A. Time-varying gradient magnetic fields (dB/dt)
B. Radiofrequency field (B1)
C. Static magnetic field (B0)
D. Cryogen venting system
Answer: A
Conceptual Explanation: PNS is caused by the rapidly switching gradient fields (dB/dt)
which can induce electric currents in the patient’s body.
6. At what field strength does the Magnetohydrodynamic (MHD) effect typically begin to
cause significant T-wave elevation on an ECG?
A. 0.5 Tesla
B. 1.5 Tesla
C. 1.0 Tesla
D. 3.0 Tesla
EXPERT (MRSE) COMPREHENSIVE
EXAM QUESTIONS & VERIFIED
ANSWERS 2026/2027 UPDATE
1. According to IEC 60601-2-33, what is the whole-body Specific Absorption Rate (SAR) limit
for the Normal Operating Mode over a 6-minute period?
A. 1.5 W/kg
B. 4.0 W/kg
C. 2.0 W/kg
D. 3.2 W/kg
Answer: C
Conceptual Explanation: The Normal Operating Mode limit for whole-body SAR is 2.0
W/kg. The First Level Controlled Operating Mode allows up to 4.0 W/kg.
2. Which physical phenomenon is responsible for the ‘missile effect’ observed when a
ferromagnetic object is brought near the MR scanner?
A. Lorentz Force
B. Magnetic Torque
C. Lenz’s Law
,D. Translational Force
Answer: D
Conceptual Explanation: The translational force (Fz) is responsible for pulling
ferromagnetic objects into the bore. It is proportional to the product of the magnetic field
and the spatial gradient (B * dB/dz).
3. What is the Specific Absorption Rate (SAR) proportional to regarding the static magnetic
field (B0) strength?
A. Linearly proportional to B0
B. Inversely proportional to B0
C. Proportional to the square of B0
D. Proportional to the square root of B0
Answer: C
Conceptual Explanation: SAR is proportional to the square of the Larmor frequency,
which is linearly related to B0. Therefore, SAR increases with the square of the static
magnetic field strength.
4. The ‘MR Conditional’ label (ASTM F2503) implies that the device:
A. Can be used safely in all MR environments.
B. Requires a physician’s supervision for every use.
C. Is unsafe if B0 is higher than 1.5 Tesla.
, D. Is safe under specific conditions including B0 strength, spatial gradient, and RF limits.
Answer: D
Conceptual Explanation: ‘MR Conditional’ means the item has been demonstrated to pose
no known hazards in a specified MRI environment under specific conditions of use.
5. Peripheral Nerve Stimulation (PNS) is primarily a bioeffect caused by which component of
the MRI system?
A. Time-varying gradient magnetic fields (dB/dt)
B. Radiofrequency field (B1)
C. Static magnetic field (B0)
D. Cryogen venting system
Answer: A
Conceptual Explanation: PNS is caused by the rapidly switching gradient fields (dB/dt)
which can induce electric currents in the patient’s body.
6. At what field strength does the Magnetohydrodynamic (MHD) effect typically begin to
cause significant T-wave elevation on an ECG?
A. 0.5 Tesla
B. 1.5 Tesla
C. 1.0 Tesla
D. 3.0 Tesla
