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100+ Free Radiology Board Practice Questions
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Sample Radiology Board Practice Questions
Try these sample questions to test your Radiology Board exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1During a pelvic CT examination, which of the following parameter changes would reduce the CTDIvol (Volume Computed Tomography Dose Index) while maintaining the pitch?
A.Increasing the tube voltage (kVp).
B.Decreasing the tube current-exposure time product (mAs).
C.Decreasing the pitch.
D.Increasing the active detector collimation width.
Explanation: CTDIvol is directly proportional to mAs (tube current-exposure time product). Decreasing mAs reduces the number of X-ray photons generated, thereby lowering the CTDIvol linearly.
2A patient with a cardiac pacemaker requires an MRI. What does the term 'MR Conditional' imply regarding the safety of this implant in the MR environment?
A.The implant is safe for MR scanning under any magnetic field strength up to 3.0 Tesla.
B.The implant can be safely scanned only under specific, strictly defined conditions of use, such as limits on static magnetic field strength, spatial gradient, and SAR.
C.The implant poses no safety hazards in any MR environment but may cause severe image artifacts.
D.The implant is safe to scan only if the pacemaker is programmed to an asynchronous pacing mode prior to the scan.
Explanation: An MR Conditional designation (represented by a yellow triangle) means that the item has been demonstrated to pose no known hazards in a specified MR environment under specific conditions of use, including static magnetic field limits, spatial gradient field, and radiofrequency heating limits (SAR).
3Regarding the biological effects of ionizing radiation, which of the following is classified as a deterministic (tissue reaction) effect?
A.Thyroid carcinoma.
B.Leukemia.
C.Hereditary genetic mutations.
D.Radiation-induced cataracts.
Explanation: Radiation-induced cataracts have a threshold dose (historically thought to be around 0.5 to 2 Gy, but recently lower threshold values have been adopted) and their severity increases with dose. This makes them a deterministic effect (tissue reaction).
4In magnetic resonance imaging, how does doubling the static magnetic field strength (from 1.5T to 3.0T) affect the Specific Absorption Rate (SAR)?
A.SAR increases by a factor of 4.
B.SAR doubles.
C.SAR remains unchanged.
D.SAR decreases by half.
Explanation: Specific Absorption Rate (SAR) represents the RF power absorbed per unit mass of tissue and is proportional to the square of the resonant frequency (B0 field strength). Doubling the B0 field from 1.5T to 3T quadruples the SAR (2^2 = 4).
5Which of the following ultrasound parameters is the primary determinant of the Mechanical Index (MI), which monitors the potential for non-thermal bioeffects like cavitation?
A.Spatial-peak temporal-average intensity (ISPTA).
B.Center frequency of the transducer.
C.Peak negative (rarefactional) pressure.
D.Pulse repetition frequency (PRF).
Explanation: The Mechanical Index (MI) is defined as the peak rarefactional (negative) pressure divided by the square root of the center frequency of the ultrasound beam. Therefore, peak rarefactional pressure is the primary numerator determinant of MI.
6What is the primary physical mechanism responsible for 'beam hardening' artifacts in clinical CT imaging?
A. Compton scattering of high-energy photons causing them to lose energy and change direction.
B.Photon starvation at highly attenuating regions, resulting in streak artifacts.
C.Preferential absorption of lower-energy photons from a polychromatic X-ray beam as it passes through the patient.
D.Non-linear amplification of signal at the detector level due to high-density materials.
Explanation: Beam hardening occurs because clinical X-ray beams are polychromatic (have a spectrum of energies). As the beam passes through the patient, lower-energy photons are preferentially absorbed (photoelectric effect), shifting the mean energy of the remaining beam to a higher level (hardening the beam).
7In digital radiography, what does the Exposure Indicator (EI) signify?
A.An estimate of the average incident radiation exposure reaching the digital detector.
B.The exact patient entrance skin dose (ESD) received during the exposure.
C.The signal-to-noise ratio (SNR) of the final processed image.
D.The spatial resolution limit of the detector system in line pairs per millimeter.
Explanation: The Exposure Indicator (EI) is a numerical value calculated by digital radiography systems that correlates with the level of radiation exposure incident on the detector. It serves as a surrogate to ensure exposures are within an acceptable diagnostic range.
8During fluoroscopically guided interventions, which of the following actions will result in the greatest reduction in radiation exposure to the performing radiologist?
A.Increasing the distance between the patient and the image receptor.
B.Using continuous fluoroscopy at 30 frames per second instead of pulsed fluoroscopy.
C.Standing on the detector side of the C-arm rather than the X-ray tube side during lateral or oblique projections.
D.Removing the grid from the image receptor.
Explanation: In lateral or oblique projections, scatter radiation is significantly higher on the side of the C-arm where the X-ray tube is located (entrance surface of the patient). Standing on the detector (exit) side of the patient significantly reduces scatter radiation exposure to the operator.
9What is the purpose of the 'anti-aliasing filter' used in CT and MRI reconstruction pipelines?
A.To eliminate frequencies higher than the Nyquist limit from the raw data prior to sampling to prevent wrap-around artifacts.
B.To reduce statistical noise in low-dose CT acquisitions using iterative loop smoothing.
C.To correct for magnetic field inhomogeneities along the phase-encoding axis.
D.To minimize the partial volume averaging effect by sharpening voxel borders.
Explanation: Aliasing occurs when signals contain frequencies higher than half the sampling frequency (the Nyquist limit). In MRI (and digital signal processing in CT), an anti-aliasing filter (analog or digital) removes these high-frequency components before sampling to prevent them from wrapping back as lower-frequency artifacts.
10A 10-year-old child requires a chest CT. Which of the following adjustments is most appropriate to optimize radiation protection in this pediatric patient?
A.Increasing the tube current (mAs) to compensate for the smaller body size.
B.Using a grid with a higher grid ratio to reduce scatter.
C.Increasing the scan coverage to include the upper abdomen routinely.
D.Lowering the tube voltage (kVp) to 80-100 kVp based on patient weight.
Explanation: Pediatric patients have smaller body diameters, meaning less X-ray attenuation. Lowering the kVp (e.g., to 80 or 100 kVp) increases image contrast (as it approaches the K-edge of iodine) and dramatically reduces radiation dose without sacrificing diagnostic quality.
About the Radiology Board Exam
This practice exam covers radiology physics/safety, neuroradiology, body imaging, musculoskeletal/pediatric imaging, and breast/interventional radiology.
Assessment
100 multiple-choice questions
Time Limit
3 hours
Passing Score
60%
Exam Fee
Free (Saudi Commission for Health Specialties (SCFHS))
Radiology Board Exam Content Outline
20%
Physics & Safety in Radiology
X-ray, CT, MRI, ultrasound physics, radiation safety (ALARA), and contrast media safety.
20%
Neuroradiology, Head & Neck
Stroke, brain tumors, spine trauma, and common head and neck pathologies.
20%
Body Imaging (Chest & Abdomen)
Thoracic, abdominal, and pelvic imaging (CT, MRI, ultrasound) diagnostics.
20%
Musculoskeletal & Pediatric Imaging
Bone fractures, soft tissue tumors, joint imaging, and pediatric-specific radiological protocols.
20%
Breast & Interventional Radiology
Mammography, breast ultrasound, biopsy procedures, and basic angiographic/drainage interventions.
How to Pass the Radiology Board Exam
What You Need to Know
- Passing score: 60%
- Assessment: 100 multiple-choice questions
- Time limit: 3 hours
- Exam fee: Free
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
Frequently Asked Questions
What is the format of the Radiology Board exam?
The exam consists of 100 multiple-choice questions covering all five content domains.
What is the passing score for the Radiology Board exam?
Candidates must score at least 60% to pass the exam.