MAGNETIC RESONANCE SAFETY
EXPERT (MRSE) FINAL EXAM
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. The translational force (Fm) exerted by a static magnetic field on a ferromagnetic object is
proportional to which of the following?
A. The square of the static magnetic field strength (B0^2)
B. The resonant frequency of the object’s material
C. The rate of change of the magnetic field over time (dB/dt)
D. The product of the magnetic field strength and the spatial gradient (B0 * dB/dx)
Answer: D
Conceptual Explanation: Translational force is the product of the object’s magnetization
and the spatial field gradient (SFG). Mathematically, it is described by the relationship B0 *
(dB/dx).
2. According to the ACR Manual on MR Safety, what is the specific definition of Zone III?
A. The region where the static magnetic field is less than 5 Gauss.
B. The region where the general public has unrestricted access.
,C. The region where there is a risk of physical interaction between patients and the MR
environment, requiring supervision by Level 2 personnel.
D. The region where the fringe field is strictly confined to the magnet room.
Answer: C
Conceptual Explanation: Zone III is the restricted area where potentially hazardous
interactions can occur. Access must be strictly controlled by MR Level 2 personnel.
3. Peripheral Nerve Stimulation (PNS) thresholds in MR are primarily associated with which
hardware component?
A. The RF Transmit Coil
B. The Static Cryostat
C. The Gradient Coils
D. The Passive Shimming Plates
Answer: C
Conceptual Explanation: PNS is caused by the time-varying magnetic fields (dB/dt)
generated by the switching of the gradient coils, which induces electrical currents in the
body’s conductive tissues.
4. An MR Conditional label for an implant implies that the device is safe for scanning only
under which of the following?
A. Scans lasting no longer than 30 minutes of total table time.
, B. Any 1.5 Tesla environment, regardless of the gradient strength.
C. Specific conditions of the static magnetic field, spatial gradient, and RF power
(SAR/B1+rms).
D. The presence of an MR Physicist during the entire procedure.
Answer: C
Conceptual Explanation: MR Conditional means the item has been demonstrated to pose
no known hazards in a specified MR environment with specified conditions of use.
5. What is the Whole-Body SAR limit for a patient scanned in ‘Normal Operating Mode’
according to IEC 60601-2-33?
A. 4.0 W/kg
B. 2.0 W/kg
C. 3.2 W/kg
D. 1.5 W/kg
Answer: B
Conceptual Explanation: In Normal Operating Mode, the whole-body SAR limit is 2.0
W/kg to prevent excessive thermal stress to the patient.
6. The Magnetohydrodynamic Effect is most commonly observed in MR as which of the
following?
A. Local skin burns near the RF coil
EXPERT (MRSE) FINAL EXAM
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. The translational force (Fm) exerted by a static magnetic field on a ferromagnetic object is
proportional to which of the following?
A. The square of the static magnetic field strength (B0^2)
B. The resonant frequency of the object’s material
C. The rate of change of the magnetic field over time (dB/dt)
D. The product of the magnetic field strength and the spatial gradient (B0 * dB/dx)
Answer: D
Conceptual Explanation: Translational force is the product of the object’s magnetization
and the spatial field gradient (SFG). Mathematically, it is described by the relationship B0 *
(dB/dx).
2. According to the ACR Manual on MR Safety, what is the specific definition of Zone III?
A. The region where the static magnetic field is less than 5 Gauss.
B. The region where the general public has unrestricted access.
,C. The region where there is a risk of physical interaction between patients and the MR
environment, requiring supervision by Level 2 personnel.
D. The region where the fringe field is strictly confined to the magnet room.
Answer: C
Conceptual Explanation: Zone III is the restricted area where potentially hazardous
interactions can occur. Access must be strictly controlled by MR Level 2 personnel.
3. Peripheral Nerve Stimulation (PNS) thresholds in MR are primarily associated with which
hardware component?
A. The RF Transmit Coil
B. The Static Cryostat
C. The Gradient Coils
D. The Passive Shimming Plates
Answer: C
Conceptual Explanation: PNS is caused by the time-varying magnetic fields (dB/dt)
generated by the switching of the gradient coils, which induces electrical currents in the
body’s conductive tissues.
4. An MR Conditional label for an implant implies that the device is safe for scanning only
under which of the following?
A. Scans lasting no longer than 30 minutes of total table time.
, B. Any 1.5 Tesla environment, regardless of the gradient strength.
C. Specific conditions of the static magnetic field, spatial gradient, and RF power
(SAR/B1+rms).
D. The presence of an MR Physicist during the entire procedure.
Answer: C
Conceptual Explanation: MR Conditional means the item has been demonstrated to pose
no known hazards in a specified MR environment with specified conditions of use.
5. What is the Whole-Body SAR limit for a patient scanned in ‘Normal Operating Mode’
according to IEC 60601-2-33?
A. 4.0 W/kg
B. 2.0 W/kg
C. 3.2 W/kg
D. 1.5 W/kg
Answer: B
Conceptual Explanation: In Normal Operating Mode, the whole-body SAR limit is 2.0
W/kg to prevent excessive thermal stress to the patient.
6. The Magnetohydrodynamic Effect is most commonly observed in MR as which of the
following?
A. Local skin burns near the RF coil
