MRSE Clinical Practice Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1.
A patient with a newly identified implanted cardiac device is scheduled
for an MRI examination. The device model and lead combination have
not yet been verified. What is the most appropriate initial safety action?
A. Proceed if the patient has undergone MRI previously
B. Proceed using Normal Operating Mode only
C. Verify the exact device and lead configuration and its current MR
safety labeling
D. Use a lower field-of-view to reduce magnetic exposure
Answer: C. Verify the exact device and lead configuration and its
current MR safety labeling.
Rationale: The MR safety status of an implanted device depends on the
precise device, components, configuration, conditions of use, and
sometimes the scanner and examination parameters. A prior
uneventful MRI does not establish safety for a different configuration
or current examination. Verification must occur before proceeding.
2.
Which physical phenomenon is primarily responsible for the attraction
of a ferromagnetic object toward a region of higher magnetic-field
strength?
,A. RF resonance
B. Magnetic field gradient acting on the object's magnetic
susceptibility
C. T1 relaxation
D. Acoustic resonance
Answer: B. Magnetic field gradient acting on the object's magnetic
susceptibility.
Rationale: Translational force on a magnetically susceptible object
depends strongly on both its magnetic properties and the spatial
gradient of the magnetic field. Objects can therefore experience
substantial force near the entrance of an MR scanner bore even
though the static field itself is strongest at isocenter.
3.
Which statement best describes the principal safety concern associated
with a long conductive implant exposed to a time-varying RF field?
A. Static-field projectile motion
B. Gradient-induced peripheral nerve stimulation only
C. RF-induced heating caused by coupling between the
electromagnetic field and the conductive structure
D. T1 shortening
Answer: C. RF-induced heating caused by coupling between the
electromagnetic field and the conductive structure.
Rationale: Long conductive structures can behave as antennas and
concentrate RF-induced currents, particularly near their tips or other
regions of high current density. This can produce localized tissue
heating even when the implant itself is not strongly attracted by the
static magnetic field.
,4.
What is the primary function of the static magnetic field, B0, in MRI?
A. Generate the acoustic noise
B. Produce the RF pulse
C. Create time-varying electric currents in tissue
D. Establish the equilibrium magnetization and determine the
Larmor frequency
Answer: D. Establish the equilibrium magnetization and determine the
Larmor frequency.
Rationale: The static field establishes the net alignment of nuclear
magnetic moments and determines their precessional frequency. For
protons, the Larmor frequency is proportional to the main magnetic-
field strength. B0 itself is not the source of the rapidly switched
gradient or RF fields.
5.
A metallic object has a strong attraction toward the scanner at the fringe-
field region but little tendency to remain magnetized after removal from
the field. Which property is most consistent with this behavior?
A. Diamagnetism
B. Paramagnetism
C. Superconductivity
D. Perfect electrical insulation
Answer: B. Paramagnetism.
Rationale: Paramagnetic materials have a small positive magnetic
susceptibility and are attracted to magnetic fields, but they generally do
not retain substantial permanent magnetization after removal from the
, external field. Ferromagnetic materials exhibit much stronger
susceptibility and can retain magnetization.
6.
Why is the entrance region of an MRI scanner especially important
when evaluating projectile risk?
A. RF power is greatest there
B. Acoustic energy is absent there
C. The spatial gradient of the static magnetic field can be substantial
there
D. The main magnetic field is zero there
Answer: C. The spatial gradient of the static magnetic field can be
substantial there.
Rationale: Projectile force is related not simply to the magnitude of B0
but to the spatial variation of the field. The bore entrance can contain
a steep field gradient, allowing ferromagnetic objects to accelerate
rapidly toward the magnet. This makes controlled access and
screening essential.
7.
A patient reports a sensation of flashing lights during a rapidly changing
gradient sequence. Which phenomenon is most directly relevant?
A. RF dielectric heating
B. Gradient-induced retinal or visual stimulation
C. Cryogen evaporation
D. Acoustic resonance of the table
Answer: B. Gradient-induced retinal or visual stimulation.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1.
A patient with a newly identified implanted cardiac device is scheduled
for an MRI examination. The device model and lead combination have
not yet been verified. What is the most appropriate initial safety action?
A. Proceed if the patient has undergone MRI previously
B. Proceed using Normal Operating Mode only
C. Verify the exact device and lead configuration and its current MR
safety labeling
D. Use a lower field-of-view to reduce magnetic exposure
Answer: C. Verify the exact device and lead configuration and its
current MR safety labeling.
Rationale: The MR safety status of an implanted device depends on the
precise device, components, configuration, conditions of use, and
sometimes the scanner and examination parameters. A prior
uneventful MRI does not establish safety for a different configuration
or current examination. Verification must occur before proceeding.
2.
Which physical phenomenon is primarily responsible for the attraction
of a ferromagnetic object toward a region of higher magnetic-field
strength?
,A. RF resonance
B. Magnetic field gradient acting on the object's magnetic
susceptibility
C. T1 relaxation
D. Acoustic resonance
Answer: B. Magnetic field gradient acting on the object's magnetic
susceptibility.
Rationale: Translational force on a magnetically susceptible object
depends strongly on both its magnetic properties and the spatial
gradient of the magnetic field. Objects can therefore experience
substantial force near the entrance of an MR scanner bore even
though the static field itself is strongest at isocenter.
3.
Which statement best describes the principal safety concern associated
with a long conductive implant exposed to a time-varying RF field?
A. Static-field projectile motion
B. Gradient-induced peripheral nerve stimulation only
C. RF-induced heating caused by coupling between the
electromagnetic field and the conductive structure
D. T1 shortening
Answer: C. RF-induced heating caused by coupling between the
electromagnetic field and the conductive structure.
Rationale: Long conductive structures can behave as antennas and
concentrate RF-induced currents, particularly near their tips or other
regions of high current density. This can produce localized tissue
heating even when the implant itself is not strongly attracted by the
static magnetic field.
,4.
What is the primary function of the static magnetic field, B0, in MRI?
A. Generate the acoustic noise
B. Produce the RF pulse
C. Create time-varying electric currents in tissue
D. Establish the equilibrium magnetization and determine the
Larmor frequency
Answer: D. Establish the equilibrium magnetization and determine the
Larmor frequency.
Rationale: The static field establishes the net alignment of nuclear
magnetic moments and determines their precessional frequency. For
protons, the Larmor frequency is proportional to the main magnetic-
field strength. B0 itself is not the source of the rapidly switched
gradient or RF fields.
5.
A metallic object has a strong attraction toward the scanner at the fringe-
field region but little tendency to remain magnetized after removal from
the field. Which property is most consistent with this behavior?
A. Diamagnetism
B. Paramagnetism
C. Superconductivity
D. Perfect electrical insulation
Answer: B. Paramagnetism.
Rationale: Paramagnetic materials have a small positive magnetic
susceptibility and are attracted to magnetic fields, but they generally do
not retain substantial permanent magnetization after removal from the
, external field. Ferromagnetic materials exhibit much stronger
susceptibility and can retain magnetization.
6.
Why is the entrance region of an MRI scanner especially important
when evaluating projectile risk?
A. RF power is greatest there
B. Acoustic energy is absent there
C. The spatial gradient of the static magnetic field can be substantial
there
D. The main magnetic field is zero there
Answer: C. The spatial gradient of the static magnetic field can be
substantial there.
Rationale: Projectile force is related not simply to the magnitude of B0
but to the spatial variation of the field. The bore entrance can contain
a steep field gradient, allowing ferromagnetic objects to accelerate
rapidly toward the magnet. This makes controlled access and
screening essential.
7.
A patient reports a sensation of flashing lights during a rapidly changing
gradient sequence. Which phenomenon is most directly relevant?
A. RF dielectric heating
B. Gradient-induced retinal or visual stimulation
C. Cryogen evaporation
D. Acoustic resonance of the table
Answer: B. Gradient-induced retinal or visual stimulation.
