MRSO PRACTICE EXAM STUDY GUIDE 2026
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <RECENT VERSION>
Section 1: MRI Safety Fundamentals and the Static Magnetic Field (B0)
1. The primary safety hazard associated with the static magnetic field (B0) is:
a) Tissue heating
b) The projectile or missile effect
c) Peripheral nerve stimulation
d) Acoustic noise
Answer: b) The projectile or missile effect
Explanation: The static magnetic field is always on and has an incredibly strong force on
ferromagnetic objects, making the projectile effect the most immediate and dangerous hazard.
2. The term "5 Gauss line" refers to:
a) The boundary within which SAR limits must be strictly enforced.
b) The fringe field where the magnetic field strength is equal to 5 Gauss (0.5 mT).
c) The point where RF power deposition is at its maximum.
d) The inner boundary of the controlled access area.
Answer: b) The fringe field where the magnetic field strength is equal to 5 Gauss (0.5
mT).
Explanation: The 5 Gauss line defines the perimeter where the static magnetic field strength
drops to 0.5 mT. This is a critical safety marker, as it is the threshold for ensuring the safety of
individuals with cardiac pacemakers and other devices.
3. According to the FDA, the static magnetic field strength for adults, children, and infants
older than 1 month is limited to:
a) 1.5 T
b) 4 T
c) 8 T
d) There is no FDA-specified limit for normal operating mode.
Answer: c) 8 T
Explanation: The FDA specifies a limit of 8 T for adult, pediatric (>1 month), and infant (>1
month) patients. For neonates (first month of life), the limit is 4 T.
4. A ferromagnetic object brought into the scan room will experience which of the following
forces?
, a) Only torque
b) Only translational force
c) Both translational and torque forces
d) Neither force, only heating
Answer: c) Both translational and torque forces
Explanation: A ferromagnetic object will experience a translational force (pulling it toward the
center of the magnet) and a torque force (twisting it to align with the magnetic field lines).
5. The most critical step in preventing projectile incidents is:
a) Using quench buttons located in the scan room.
b) Rigorous screening of all persons and objects before they enter the scan room.
c) Placing warning signs on all doors.
d) Using non-ferromagnetic equipment only.
Answer: b) Rigorous screening of all persons and objects before they enter the scan
room.
Explanation: While all options are important, primary prevention through meticulous screening
at the magnet room entry point is the single most effective way to stop a projectile incident before
it can happen.
Section 2: Radiofrequency (RF) Fields and Specific Absorption Rate (SAR)
6. The primary biological effect of the Radiofrequency (RF) magnetic field used in MRI is:
a) Induced electrical currents
b) Tissue heating
c) Direct nerve stimulation
d) Magnetophosphenes
Answer: b) Tissue heating
Explanation: The oscillating RF field causes molecular rotation, particularly in water molecules,
which is converted into thermal energy (heat) within the tissues.
7. Specific Absorption Rate (SAR) is defined as:
a) The rate at which RF power is transmitted by the coil.
b) The power absorbed per unit mass of tissue, measured in Watts per kilogram (W/kg).
c) The measurement of the static magnetic field strength.
d) The rate of change of the gradient magnetic field.
Answer: b) The power absorbed per unit mass of tissue, measured in Watts per kilogram
(W/kg).
Explanation: SAR is the dosimetric measure for RF exposure. It quantifies the energy deposited
in the patient's body over time.
COMPLETE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED
PASS <RECENT VERSION>
Section 1: MRI Safety Fundamentals and the Static Magnetic Field (B0)
1. The primary safety hazard associated with the static magnetic field (B0) is:
a) Tissue heating
b) The projectile or missile effect
c) Peripheral nerve stimulation
d) Acoustic noise
Answer: b) The projectile or missile effect
Explanation: The static magnetic field is always on and has an incredibly strong force on
ferromagnetic objects, making the projectile effect the most immediate and dangerous hazard.
2. The term "5 Gauss line" refers to:
a) The boundary within which SAR limits must be strictly enforced.
b) The fringe field where the magnetic field strength is equal to 5 Gauss (0.5 mT).
c) The point where RF power deposition is at its maximum.
d) The inner boundary of the controlled access area.
Answer: b) The fringe field where the magnetic field strength is equal to 5 Gauss (0.5
mT).
Explanation: The 5 Gauss line defines the perimeter where the static magnetic field strength
drops to 0.5 mT. This is a critical safety marker, as it is the threshold for ensuring the safety of
individuals with cardiac pacemakers and other devices.
3. According to the FDA, the static magnetic field strength for adults, children, and infants
older than 1 month is limited to:
a) 1.5 T
b) 4 T
c) 8 T
d) There is no FDA-specified limit for normal operating mode.
Answer: c) 8 T
Explanation: The FDA specifies a limit of 8 T for adult, pediatric (>1 month), and infant (>1
month) patients. For neonates (first month of life), the limit is 4 T.
4. A ferromagnetic object brought into the scan room will experience which of the following
forces?
, a) Only torque
b) Only translational force
c) Both translational and torque forces
d) Neither force, only heating
Answer: c) Both translational and torque forces
Explanation: A ferromagnetic object will experience a translational force (pulling it toward the
center of the magnet) and a torque force (twisting it to align with the magnetic field lines).
5. The most critical step in preventing projectile incidents is:
a) Using quench buttons located in the scan room.
b) Rigorous screening of all persons and objects before they enter the scan room.
c) Placing warning signs on all doors.
d) Using non-ferromagnetic equipment only.
Answer: b) Rigorous screening of all persons and objects before they enter the scan
room.
Explanation: While all options are important, primary prevention through meticulous screening
at the magnet room entry point is the single most effective way to stop a projectile incident before
it can happen.
Section 2: Radiofrequency (RF) Fields and Specific Absorption Rate (SAR)
6. The primary biological effect of the Radiofrequency (RF) magnetic field used in MRI is:
a) Induced electrical currents
b) Tissue heating
c) Direct nerve stimulation
d) Magnetophosphenes
Answer: b) Tissue heating
Explanation: The oscillating RF field causes molecular rotation, particularly in water molecules,
which is converted into thermal energy (heat) within the tissues.
7. Specific Absorption Rate (SAR) is defined as:
a) The rate at which RF power is transmitted by the coil.
b) The power absorbed per unit mass of tissue, measured in Watts per kilogram (W/kg).
c) The measurement of the static magnetic field strength.
d) The rate of change of the gradient magnetic field.
Answer: b) The power absorbed per unit mass of tissue, measured in Watts per kilogram
(W/kg).
Explanation: SAR is the dosimetric measure for RF exposure. It quantifies the energy deposited
in the patient's body over time.
