MRI Quality Control Exam Practice
Questions and Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of an MRI quality control program?
A. To increase the magnetic field strength
B. To replace preventive maintenance
C. To monitor system performance and identify changes that could affect image
quality
D. To eliminate the need for clinical protocol review
Correct Answer: C. To monitor system performance and identify changes that
could affect image quality
Rationale: An MRI QC program establishes a systematic method for monitoring
scanner performance over time. Comparing measurements with baseline values
and action limits can identify deterioration before it significantly affects clinical
imaging.
Question 2
Who should have responsibility for overseeing an MRI equipment quality control
program?
A. The patient
B. A qualified medical physicist or MR scientist
C. The hospital receptionist
D. The MRI patient transporter
,Correct Answer: B. A qualified medical physicist or MR scientist
Rationale: The ACR QC framework assigns oversight of the equipment QC program
to a qualified medical physicist or MR scientist. Technologists and other personnel
may perform designated measurements, but overall program oversight requires
appropriate qualified expertise.
Question 3
What is the purpose of establishing baseline QC measurements?
A. To provide a reference for detecting later changes in system performance
B. To determine patient weight limits
C. To select the MRI manufacturer's software
D. To determine the patient's preferred scan orientation
Correct Answer: A. To provide a reference for detecting later changes in system
performance
Rationale: Baseline measurements represent the system's expected performance
under defined conditions. Future measurements can be compared with these
values to identify meaningful changes or deterioration.
Question 4
Which measurement evaluates the consistency of the main static magnetic field
over a specified volume?
A. Slice thickness
B. Ghosting ratio
C. High-contrast resolution
D. Magnetic-field homogeneity
Correct Answer: D. Magnetic-field homogeneity
Rationale: Magnetic-field homogeneity evaluates how uniform the main magnetic
field, B0, is across the relevant volume. Field inhomogeneity can contribute to
,image distortion, reduced image quality, and SNR degradation in certain
sequences.
Question 5
Why is magnetic-field homogeneity important for MRI image quality?
A. It determines the patient's respiratory rate
B. Poor homogeneity can contribute to distortion and reduced image quality
C. It eliminates the need for RF calibration
D. It determines the number of patients scanned per day
Correct Answer: B. Poor homogeneity can contribute to distortion and reduced
image quality
Rationale: Variations in B0 can alter resonance conditions across the imaging
volume. These variations may produce geometric distortion and affect signal
behavior, particularly in sequences sensitive to field inhomogeneity.
Question 6
What is the primary purpose of measuring slice thickness accuracy?
A. To determine whether the prescribed and actual slice thicknesses agree
B. To determine acoustic noise
C. To measure monitor luminance
D. To evaluate patient positioning comfort
Correct Answer: A. To determine whether the prescribed and actual slice
thicknesses agree
Rationale: Slice-thickness accuracy testing determines whether the scanner
produces slices with the intended thickness. Significant deviations can affect
spatial resolution, contrast, SNR, and partial-volume effects.
Question 7
, A scanner is prescribed to acquire 5-mm slices, but QC measurements
consistently show substantially thinner slices. Which parameter is directly being
evaluated?
A. Signal uniformity
B. Slice thickness accuracy
C. Center frequency
D. Ghosting
Correct Answer: B. Slice thickness accuracy
Rationale: The comparison between prescribed and measured slice thickness
directly assesses slice-thickness accuracy. Persistent discrepancies can indicate
problems with sequence implementation, calibration, or system performance.
Question 8
What does slice-position accuracy evaluate?
A. Whether acquired slices are located where they were prescribed
B. Whether the MRI room is adequately illuminated
C. Whether the patient table moves quietly
D. Whether the RF coil has sufficient electrical insulation
Correct Answer: A. Whether acquired slices are located where they were
prescribed
Rationale: Slice-position accuracy evaluates the correspondence between
prescribed and actual slice locations. Incorrect slice positioning can affect
anatomic coverage and reproducibility between examinations.
Question 9
Which MRI QC test specifically assesses the ability to distinguish small objects
with high signal or intensity differences?
A. Low-contrast detectability
B. High-contrast spatial resolution
Questions and Correct Answers
(Verified Answers) Plus Rationales 2027
Q&A | Instant Download Pdf
Question 1
What is the primary purpose of an MRI quality control program?
A. To increase the magnetic field strength
B. To replace preventive maintenance
C. To monitor system performance and identify changes that could affect image
quality
D. To eliminate the need for clinical protocol review
Correct Answer: C. To monitor system performance and identify changes that
could affect image quality
Rationale: An MRI QC program establishes a systematic method for monitoring
scanner performance over time. Comparing measurements with baseline values
and action limits can identify deterioration before it significantly affects clinical
imaging.
Question 2
Who should have responsibility for overseeing an MRI equipment quality control
program?
A. The patient
B. A qualified medical physicist or MR scientist
C. The hospital receptionist
D. The MRI patient transporter
,Correct Answer: B. A qualified medical physicist or MR scientist
Rationale: The ACR QC framework assigns oversight of the equipment QC program
to a qualified medical physicist or MR scientist. Technologists and other personnel
may perform designated measurements, but overall program oversight requires
appropriate qualified expertise.
Question 3
What is the purpose of establishing baseline QC measurements?
A. To provide a reference for detecting later changes in system performance
B. To determine patient weight limits
C. To select the MRI manufacturer's software
D. To determine the patient's preferred scan orientation
Correct Answer: A. To provide a reference for detecting later changes in system
performance
Rationale: Baseline measurements represent the system's expected performance
under defined conditions. Future measurements can be compared with these
values to identify meaningful changes or deterioration.
Question 4
Which measurement evaluates the consistency of the main static magnetic field
over a specified volume?
A. Slice thickness
B. Ghosting ratio
C. High-contrast resolution
D. Magnetic-field homogeneity
Correct Answer: D. Magnetic-field homogeneity
Rationale: Magnetic-field homogeneity evaluates how uniform the main magnetic
field, B0, is across the relevant volume. Field inhomogeneity can contribute to
,image distortion, reduced image quality, and SNR degradation in certain
sequences.
Question 5
Why is magnetic-field homogeneity important for MRI image quality?
A. It determines the patient's respiratory rate
B. Poor homogeneity can contribute to distortion and reduced image quality
C. It eliminates the need for RF calibration
D. It determines the number of patients scanned per day
Correct Answer: B. Poor homogeneity can contribute to distortion and reduced
image quality
Rationale: Variations in B0 can alter resonance conditions across the imaging
volume. These variations may produce geometric distortion and affect signal
behavior, particularly in sequences sensitive to field inhomogeneity.
Question 6
What is the primary purpose of measuring slice thickness accuracy?
A. To determine whether the prescribed and actual slice thicknesses agree
B. To determine acoustic noise
C. To measure monitor luminance
D. To evaluate patient positioning comfort
Correct Answer: A. To determine whether the prescribed and actual slice
thicknesses agree
Rationale: Slice-thickness accuracy testing determines whether the scanner
produces slices with the intended thickness. Significant deviations can affect
spatial resolution, contrast, SNR, and partial-volume effects.
Question 7
, A scanner is prescribed to acquire 5-mm slices, but QC measurements
consistently show substantially thinner slices. Which parameter is directly being
evaluated?
A. Signal uniformity
B. Slice thickness accuracy
C. Center frequency
D. Ghosting
Correct Answer: B. Slice thickness accuracy
Rationale: The comparison between prescribed and measured slice thickness
directly assesses slice-thickness accuracy. Persistent discrepancies can indicate
problems with sequence implementation, calibration, or system performance.
Question 8
What does slice-position accuracy evaluate?
A. Whether acquired slices are located where they were prescribed
B. Whether the MRI room is adequately illuminated
C. Whether the patient table moves quietly
D. Whether the RF coil has sufficient electrical insulation
Correct Answer: A. Whether acquired slices are located where they were
prescribed
Rationale: Slice-position accuracy evaluates the correspondence between
prescribed and actual slice locations. Incorrect slice positioning can affect
anatomic coverage and reproducibility between examinations.
Question 9
Which MRI QC test specifically assesses the ability to distinguish small objects
with high signal or intensity differences?
A. Low-contrast detectability
B. High-contrast spatial resolution
