MAGNETIC RESONANCE SAFETY
EXPERT (MRSE) COMPREHENSIVE
EXAM PREP QUESTIONS & VERIFIED
ANSWERS 2026/2027 UPDATE
1. According to the ACR Manual on MR Safety, which zone is the region where there is a risk
of physical injury from the static magnetic field?
A. Zone IV
B. Zone II
C. Zone III
D. Zone I
Answer: A
Conceptual Explanation: Zone IV is the MR scanner room itself, where the magnetic field
is strongest and poses a risk of projectile injuries or biological effects.
2. What is the primary bio-effect associated with exposure to time-varying magnetic fields
(dB/dt)?
A. Tissue heating
B. Vertigo
C. Peripheral nerve stimulation
,D. Magnetophosphenes
Answer: C
Conceptual Explanation: Time-varying gradient fields induce electrical currents in the
body, which most commonly results in peripheral nerve stimulation (PNS).
3. The Specific Absorption Rate (SAR) is primarily a measure of:
A. Magnetic field strength
B. RF energy deposition in tissue
C. Gradient switching speed
D. Acoustic noise levels
Answer: B
Conceptual Explanation: SAR represents the rate at which RF energy is absorbed by the
body, measured in Watts per kilogram (W/kg), leading to tissue heating.
4. Under the IEC 60601-2-33 standard, the ‘First Level Controlled Operating Mode’ allows for
a whole-body SAR limit of:
A. 2.0 W/kg
B. 8.0 W/kg
C. 4.0 W/kg
D. 10.0 W/kg
, Answer: C
Conceptual Explanation: In First Level Controlled Operating Mode, the limit for whole-
body SAR is 4.0 W/kg for a 6-minute period.
5. Which ASTM symbol represents a device that is known to pose hazards in all MR
environments?
A. A green square with ‘MR’
B. A yellow triangle with ‘MR’
C. A red circle with a diagonal bar and ‘MR’
D. A blue circle with ‘MR’
Answer: C
Conceptual Explanation: The red circle with a diagonal bar is the ASTM symbol for ‘MR
Unsafe’.
6. What is the primary safety concern regarding a ‘quench’ in a superconducting magnet?
A. Loss of image quality
B. Gradient coil failure
C. Increased acoustic noise
D. Helium gas displacing oxygen in the room
Answer: D
EXPERT (MRSE) COMPREHENSIVE
EXAM PREP QUESTIONS & VERIFIED
ANSWERS 2026/2027 UPDATE
1. According to the ACR Manual on MR Safety, which zone is the region where there is a risk
of physical injury from the static magnetic field?
A. Zone IV
B. Zone II
C. Zone III
D. Zone I
Answer: A
Conceptual Explanation: Zone IV is the MR scanner room itself, where the magnetic field
is strongest and poses a risk of projectile injuries or biological effects.
2. What is the primary bio-effect associated with exposure to time-varying magnetic fields
(dB/dt)?
A. Tissue heating
B. Vertigo
C. Peripheral nerve stimulation
,D. Magnetophosphenes
Answer: C
Conceptual Explanation: Time-varying gradient fields induce electrical currents in the
body, which most commonly results in peripheral nerve stimulation (PNS).
3. The Specific Absorption Rate (SAR) is primarily a measure of:
A. Magnetic field strength
B. RF energy deposition in tissue
C. Gradient switching speed
D. Acoustic noise levels
Answer: B
Conceptual Explanation: SAR represents the rate at which RF energy is absorbed by the
body, measured in Watts per kilogram (W/kg), leading to tissue heating.
4. Under the IEC 60601-2-33 standard, the ‘First Level Controlled Operating Mode’ allows for
a whole-body SAR limit of:
A. 2.0 W/kg
B. 8.0 W/kg
C. 4.0 W/kg
D. 10.0 W/kg
, Answer: C
Conceptual Explanation: In First Level Controlled Operating Mode, the limit for whole-
body SAR is 4.0 W/kg for a 6-minute period.
5. Which ASTM symbol represents a device that is known to pose hazards in all MR
environments?
A. A green square with ‘MR’
B. A yellow triangle with ‘MR’
C. A red circle with a diagonal bar and ‘MR’
D. A blue circle with ‘MR’
Answer: C
Conceptual Explanation: The red circle with a diagonal bar is the ASTM symbol for ‘MR
Unsafe’.
6. What is the primary safety concern regarding a ‘quench’ in a superconducting magnet?
A. Loss of image quality
B. Gradient coil failure
C. Increased acoustic noise
D. Helium gas displacing oxygen in the room
Answer: D
