MRI Prosthesis Safety Exam Practice
Questions and Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
Question 1
What is the first step when a patient reports having an implanted prosthesis
before an MRI examination?
A. Assume the prosthesis is MR Safe
B. Identify the specific prosthesis and determine its MR safety status
C. Remove the prosthesis
D. Begin scanning at the lowest available field strength
Answer: B
The specific implant should be identified before determining whether MRI can
safely proceed. Device manufacturer, model, location, and applicable MR
conditions may all be relevant to the safety assessment. The FDA recommends
identifying implanted devices and consulting their MRI safety information before
scanning.
Question 2
What does the MR Conditional designation mean for a prosthesis?
A. It is safe in every MRI environment
B. It contains no metal
C. It may be scanned only when specified conditions are satisfied
D. It should never enter an MRI scanner
Answer: C
,MR Conditional means that the device has been demonstrated to be safe only
under specified conditions. Those conditions can include scanner field strength, RF
exposure, gradient conditions, positioning, or other requirements.
Question 3
How should an implanted prosthesis with unknown MR safety status generally be
treated?
A. As MR Safe
B. As MR Conditional
C. As safe if it is more than one year old
D. As MR Unsafe until its status can be established
Answer: D
An unidentified or inadequately documented implant should not be assumed to be
safe. FDA guidance states that devices without known MR safety information
should be considered unsafe until their status can be established.
Question 4
Which MRI interaction can cause movement of a susceptible prosthesis?
A. Acoustic noise
B. Static magnetic-field force
C. Patient respiration
D. Gradient cooling
Answer: B
The strong static magnetic field can exert translational forces on magnetic
materials. Depending on the device and its fixation, these forces can contribute to
movement or mechanical stress.
Question 5
,What is magnetic torque?
A. Heating produced by RF energy
B. Image distortion caused by metal
C. A rotational force exerted on a magnetically susceptible object by the
magnetic field
D. Vibration caused by acoustic noise
Answer: C
Magnetic torque can attempt to rotate a magnetically susceptible object so that it
aligns with the magnetic field. The magnitude and clinical significance depend on
the implant's design, materials, orientation, and fixation.
Question 6
Which MRI energy source is particularly relevant to implant heating?
A. Static magnetic field only
B. Acoustic energy
C. Radiofrequency (RF) energy
D. Visible light
Answer: C
RF energy can cause heating of implanted devices and surrounding tissue. This is
one reason MR Conditional implants may have specified RF or SAR restrictions.
Question 7
What is a potential consequence of excessive heating around a prosthesis?
A. Improved image quality
B. Thermal injury to surrounding tissue
C. Reduced magnetic field strength
D. Automatic device removal
Answer: B
, RF-induced heating can raise the temperature of an implant or adjacent tissue and
may result in a burn or other thermal injury if safety conditions are exceeded.
Question 8
Why is the specific model of an implanted prosthesis important?
A. Prostheses of the same general type always have identical MR conditions
B. Different models can have different MR safety labeling and scanning
conditions
C. The model determines the patient's blood pressure
D. The model determines the MRI room temperature
Answer: B
MR safety cannot reliably be determined solely from the general category of an
implant. Different models or generations can have different materials,
construction, and tested MR conditions.
Question 9
Which document may provide important MRI safety information for an implanted
prosthesis?
A. The patient's appointment card
B. A general hospital brochure
C. The manufacturer's MR safety labeling or instructions for use
D. The MRI technologist's personal notes
Answer: C
Manufacturer labeling and instructions for use are key sources for determining
whether a device is MR Safe or MR Conditional and for identifying the conditions
that must be followed.
Question 10
Questions and Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
Question 1
What is the first step when a patient reports having an implanted prosthesis
before an MRI examination?
A. Assume the prosthesis is MR Safe
B. Identify the specific prosthesis and determine its MR safety status
C. Remove the prosthesis
D. Begin scanning at the lowest available field strength
Answer: B
The specific implant should be identified before determining whether MRI can
safely proceed. Device manufacturer, model, location, and applicable MR
conditions may all be relevant to the safety assessment. The FDA recommends
identifying implanted devices and consulting their MRI safety information before
scanning.
Question 2
What does the MR Conditional designation mean for a prosthesis?
A. It is safe in every MRI environment
B. It contains no metal
C. It may be scanned only when specified conditions are satisfied
D. It should never enter an MRI scanner
Answer: C
,MR Conditional means that the device has been demonstrated to be safe only
under specified conditions. Those conditions can include scanner field strength, RF
exposure, gradient conditions, positioning, or other requirements.
Question 3
How should an implanted prosthesis with unknown MR safety status generally be
treated?
A. As MR Safe
B. As MR Conditional
C. As safe if it is more than one year old
D. As MR Unsafe until its status can be established
Answer: D
An unidentified or inadequately documented implant should not be assumed to be
safe. FDA guidance states that devices without known MR safety information
should be considered unsafe until their status can be established.
Question 4
Which MRI interaction can cause movement of a susceptible prosthesis?
A. Acoustic noise
B. Static magnetic-field force
C. Patient respiration
D. Gradient cooling
Answer: B
The strong static magnetic field can exert translational forces on magnetic
materials. Depending on the device and its fixation, these forces can contribute to
movement or mechanical stress.
Question 5
,What is magnetic torque?
A. Heating produced by RF energy
B. Image distortion caused by metal
C. A rotational force exerted on a magnetically susceptible object by the
magnetic field
D. Vibration caused by acoustic noise
Answer: C
Magnetic torque can attempt to rotate a magnetically susceptible object so that it
aligns with the magnetic field. The magnitude and clinical significance depend on
the implant's design, materials, orientation, and fixation.
Question 6
Which MRI energy source is particularly relevant to implant heating?
A. Static magnetic field only
B. Acoustic energy
C. Radiofrequency (RF) energy
D. Visible light
Answer: C
RF energy can cause heating of implanted devices and surrounding tissue. This is
one reason MR Conditional implants may have specified RF or SAR restrictions.
Question 7
What is a potential consequence of excessive heating around a prosthesis?
A. Improved image quality
B. Thermal injury to surrounding tissue
C. Reduced magnetic field strength
D. Automatic device removal
Answer: B
, RF-induced heating can raise the temperature of an implant or adjacent tissue and
may result in a burn or other thermal injury if safety conditions are exceeded.
Question 8
Why is the specific model of an implanted prosthesis important?
A. Prostheses of the same general type always have identical MR conditions
B. Different models can have different MR safety labeling and scanning
conditions
C. The model determines the patient's blood pressure
D. The model determines the MRI room temperature
Answer: B
MR safety cannot reliably be determined solely from the general category of an
implant. Different models or generations can have different materials,
construction, and tested MR conditions.
Question 9
Which document may provide important MRI safety information for an implanted
prosthesis?
A. The patient's appointment card
B. A general hospital brochure
C. The manufacturer's MR safety labeling or instructions for use
D. The MRI technologist's personal notes
Answer: C
Manufacturer labeling and instructions for use are key sources for determining
whether a device is MR Safe or MR Conditional and for identifying the conditions
that must be followed.
Question 10
