MAGNETIC RESONANCE SAFETY
EXPERT (MRSE) FINAL EXAM PREP
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. According to the ACR Manual on MR Safety, what is the specific requirement for Level 2
MR Personnel regarding Zone IV access?
A. They are permitted to enter Zone IV only when accompanied by the MRMD.
B. They must be medically cleared for 3T environments every 6 months.
C. They are trained to provide direct supervision of non-MR personnel in Zone IV.
D. They are only allowed in Zone IV during active scanning procedures.
Answer: C
Conceptual Explanation: Level 2 MR Personnel are those who have been more extensively
trained and educated in the broader MR safety issues. They are responsible for the safety of
all individuals in Zone IV and must provide direct supervision of Level 1 and non-MR
personnel.
2. The spatial field gradient (dB/dx) is primarily responsible for which of the following
physical effects on a ferromagnetic object?
A. Rotational torque
,B. Radiofrequency heating
C. Translational attraction force
D. Peripheral nerve stimulation
Answer: C
Conceptual Explanation: The spatial field gradient describes the change in the static
magnetic field over distance. It is the primary factor responsible for the translational force
that pulls ferromagnetic objects toward the bore (the missile effect).
3. Liquid helium has a gaseous expansion ratio of approximately:
A. 1:500
B. 1:650
C. 1:1000
D. 1:748
Answer: D
Conceptual Explanation: Liquid helium expands by a factor of approximately 748 to 1
when it transitions from a liquid to a gas at room temperature, which is a critical factor
during a quench.
4. Which parameter is the primary determinant of the Specific Absorption Rate (SAR) in a
patient?
A. Static magnetic field strength (B0)
, B. Slew rate of the gradient coils
C. Patient weight and RF flip angle
D. Cryogen boil-off rate
Answer: C
Conceptual Explanation: SAR is proportional to the square of the B1 field (flip angle) and
is calculated based on the patient’s weight. It measures the rate at which RF energy is
absorbed by the body.
5. A ‘MR Conditional’ label on a medical device implies that:
A. The device may be used safely only under the specific conditions defined by the
manufacturer.
B. The device is safe for all MR environments regardless of field strength.
C. The device contains no metallic components.
D. The device is only safe for 1.5T systems but not 3T systems.
Answer: A
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 (e.g.,
field strength, gradient limits, SAR limits).
EXPERT (MRSE) FINAL EXAM PREP
QUESTIONS & VERIFIED ANSWERS
2026/2027 UPDATE
1. According to the ACR Manual on MR Safety, what is the specific requirement for Level 2
MR Personnel regarding Zone IV access?
A. They are permitted to enter Zone IV only when accompanied by the MRMD.
B. They must be medically cleared for 3T environments every 6 months.
C. They are trained to provide direct supervision of non-MR personnel in Zone IV.
D. They are only allowed in Zone IV during active scanning procedures.
Answer: C
Conceptual Explanation: Level 2 MR Personnel are those who have been more extensively
trained and educated in the broader MR safety issues. They are responsible for the safety of
all individuals in Zone IV and must provide direct supervision of Level 1 and non-MR
personnel.
2. The spatial field gradient (dB/dx) is primarily responsible for which of the following
physical effects on a ferromagnetic object?
A. Rotational torque
,B. Radiofrequency heating
C. Translational attraction force
D. Peripheral nerve stimulation
Answer: C
Conceptual Explanation: The spatial field gradient describes the change in the static
magnetic field over distance. It is the primary factor responsible for the translational force
that pulls ferromagnetic objects toward the bore (the missile effect).
3. Liquid helium has a gaseous expansion ratio of approximately:
A. 1:500
B. 1:650
C. 1:1000
D. 1:748
Answer: D
Conceptual Explanation: Liquid helium expands by a factor of approximately 748 to 1
when it transitions from a liquid to a gas at room temperature, which is a critical factor
during a quench.
4. Which parameter is the primary determinant of the Specific Absorption Rate (SAR) in a
patient?
A. Static magnetic field strength (B0)
, B. Slew rate of the gradient coils
C. Patient weight and RF flip angle
D. Cryogen boil-off rate
Answer: C
Conceptual Explanation: SAR is proportional to the square of the B1 field (flip angle) and
is calculated based on the patient’s weight. It measures the rate at which RF energy is
absorbed by the body.
5. A ‘MR Conditional’ label on a medical device implies that:
A. The device may be used safely only under the specific conditions defined by the
manufacturer.
B. The device is safe for all MR environments regardless of field strength.
C. The device contains no metallic components.
D. The device is only safe for 1.5T systems but not 3T systems.
Answer: A
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 (e.g.,
field strength, gradient limits, SAR limits).
