Page 1 of 88
ABR Medical Physics Certification Examination ACTUAL EXAM
COMPLETE QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR-JUST RELEASED
SUMMARIZED EXAM COVERAGE
You will be tested on:
• Core radiation physics principles
• Dosimetry calculations and measurement
• Understanding of imaging modalities (CT, MRI, US, NM)
• Radiation safety and ALARA
• Radiotherapy planning and QA
• Applied math and statistics in physics
1.
A medical physicist is evaluating X-ray interactions in soft tissue during diagnostic imaging. Which
interaction is most dominant at typical diagnostic energy levels?
, Page 2 of 88
A. Pair production
B. Photoelectric effect
C. Compton scattering
D. Nuclear fission
Answer: C
Rationale: Compton scattering dominates in soft tissue at diagnostic energies, affecting image contrast.
2.
A physicist measures absorbed radiation dose in tissue. What is the SI unit used for absorbed dose?
A. Sievert
B. Gray
C. Coulomb
D. Becquerel
Answer: B
3.
A CT scanner produces cross-sectional images using rotating X-ray beams. What is the primary
advantage of CT over conventional radiography?
A. Lower resolution
B. Cross-sectional imaging eliminating superimposition
, Page 3 of 88
C. Reduced cost
D. No radiation
Answer: B
4.
A patient undergoes MRI imaging. What physical property is primarily measured to generate MRI
images?
A. Electron density
B. Nuclear spin and relaxation properties of hydrogen
C. Acoustic impedance
D. Radiation dose
Answer: B
5.
A physicist applies the ALARA principle during imaging procedures. What does ALARA stand for?
A. Always Limit All Radiation
B. As Low As Reasonably Achievable
C. Allow Limited Annual Radiation
D. Avoid Long-term Radiation
, Page 4 of 88
Answer: B
6.
A radioactive isotope used in nuclear medicine decays with a half-life of 6 hours. What does this mean?
A. Activity doubles every 6 hours
B. Activity reduces by half every 6 hours
C. Radiation stops after 6 hours
D. Dose increases after 6 hours
Answer: B
7.
A physicist evaluates image quality and notices grainy appearance due to random fluctuations. What is
this phenomenon called?
A. Resolution
B. Noise
C. Contrast
D. Artifact
Answer: B
ABR Medical Physics Certification Examination ACTUAL EXAM
COMPLETE QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR-JUST RELEASED
SUMMARIZED EXAM COVERAGE
You will be tested on:
• Core radiation physics principles
• Dosimetry calculations and measurement
• Understanding of imaging modalities (CT, MRI, US, NM)
• Radiation safety and ALARA
• Radiotherapy planning and QA
• Applied math and statistics in physics
1.
A medical physicist is evaluating X-ray interactions in soft tissue during diagnostic imaging. Which
interaction is most dominant at typical diagnostic energy levels?
, Page 2 of 88
A. Pair production
B. Photoelectric effect
C. Compton scattering
D. Nuclear fission
Answer: C
Rationale: Compton scattering dominates in soft tissue at diagnostic energies, affecting image contrast.
2.
A physicist measures absorbed radiation dose in tissue. What is the SI unit used for absorbed dose?
A. Sievert
B. Gray
C. Coulomb
D. Becquerel
Answer: B
3.
A CT scanner produces cross-sectional images using rotating X-ray beams. What is the primary
advantage of CT over conventional radiography?
A. Lower resolution
B. Cross-sectional imaging eliminating superimposition
, Page 3 of 88
C. Reduced cost
D. No radiation
Answer: B
4.
A patient undergoes MRI imaging. What physical property is primarily measured to generate MRI
images?
A. Electron density
B. Nuclear spin and relaxation properties of hydrogen
C. Acoustic impedance
D. Radiation dose
Answer: B
5.
A physicist applies the ALARA principle during imaging procedures. What does ALARA stand for?
A. Always Limit All Radiation
B. As Low As Reasonably Achievable
C. Allow Limited Annual Radiation
D. Avoid Long-term Radiation
, Page 4 of 88
Answer: B
6.
A radioactive isotope used in nuclear medicine decays with a half-life of 6 hours. What does this mean?
A. Activity doubles every 6 hours
B. Activity reduces by half every 6 hours
C. Radiation stops after 6 hours
D. Dose increases after 6 hours
Answer: B
7.
A physicist evaluates image quality and notices grainy appearance due to random fluctuations. What is
this phenomenon called?
A. Resolution
B. Noise
C. Contrast
D. Artifact
Answer: B
