ARIZONA DIAGNOSTIC RADIOLOGY
SPECIALIST EXAM QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES
LATEST 2026 TREND
Question 1
Which imaging modality uses ionizing radiation?
A. MRI
B. Ultrasound
C. CT
D. Echocardiography
Correct Answer: C. CT
Rationale: CT uses X-rays, which are a form of ionizing radiation. MRI
and ultrasound do not use ionizing radiation.
Question 2
The standard unit used to measure absorbed radiation dose is:
A. Sievert (Sv)
B. Gray (Gy)
C. Becquerel (Bq)
D. Curie (Ci)
Correct Answer: B. Gray (Gy)
Rationale: Gray measures absorbed radiation dose. Sievert reflects
biological effect, while Becquerel and Curie measure radioactivity.
,Question 3
Which principle aims to minimize radiation exposure?
A. ALARA
B. HIPAA
C. OSHA
D. PACS
Correct Answer: A. ALARA
Rationale: ALARA stands for "As Low As Reasonably Achievable"
and guides radiation safety practices.
Question 4
The modality of choice for acute intracranial hemorrhage is:
A. MRI T2
B. Non-contrast CT
C. Ultrasound
D. PET
Correct Answer: B. Non-contrast CT
Rationale: Fresh blood is readily detected on non-contrast CT, making
it the first-line study.
Question 5
The contrast agent most commonly used in CT imaging is:
, A. Gadolinium
B. Barium sulfate
C. Iodinated contrast
D. Microbubbles
Correct Answer: C. Iodinated contrast
Rationale: Iodinated contrast enhances vascular and soft tissue
structures during CT studies.
Question 6
Which modality is best for evaluating rotator cuff tears?
A. CT
B. MRI
C. X-ray
D. Fluoroscopy
Correct Answer: B. MRI
Rationale: MRI provides excellent soft tissue contrast and detailed
tendon visualization.
Question 7
A chest radiograph is usually obtained in which projection?
A. AP only
B. PA and lateral
C. Oblique only
D. Decubitus only
Correct Answer: B. PA and lateral
SPECIALIST EXAM QUESTIONS WITH
CORRECT ANSWERS AND RATIONALES
LATEST 2026 TREND
Question 1
Which imaging modality uses ionizing radiation?
A. MRI
B. Ultrasound
C. CT
D. Echocardiography
Correct Answer: C. CT
Rationale: CT uses X-rays, which are a form of ionizing radiation. MRI
and ultrasound do not use ionizing radiation.
Question 2
The standard unit used to measure absorbed radiation dose is:
A. Sievert (Sv)
B. Gray (Gy)
C. Becquerel (Bq)
D. Curie (Ci)
Correct Answer: B. Gray (Gy)
Rationale: Gray measures absorbed radiation dose. Sievert reflects
biological effect, while Becquerel and Curie measure radioactivity.
,Question 3
Which principle aims to minimize radiation exposure?
A. ALARA
B. HIPAA
C. OSHA
D. PACS
Correct Answer: A. ALARA
Rationale: ALARA stands for "As Low As Reasonably Achievable"
and guides radiation safety practices.
Question 4
The modality of choice for acute intracranial hemorrhage is:
A. MRI T2
B. Non-contrast CT
C. Ultrasound
D. PET
Correct Answer: B. Non-contrast CT
Rationale: Fresh blood is readily detected on non-contrast CT, making
it the first-line study.
Question 5
The contrast agent most commonly used in CT imaging is:
, A. Gadolinium
B. Barium sulfate
C. Iodinated contrast
D. Microbubbles
Correct Answer: C. Iodinated contrast
Rationale: Iodinated contrast enhances vascular and soft tissue
structures during CT studies.
Question 6
Which modality is best for evaluating rotator cuff tears?
A. CT
B. MRI
C. X-ray
D. Fluoroscopy
Correct Answer: B. MRI
Rationale: MRI provides excellent soft tissue contrast and detailed
tendon visualization.
Question 7
A chest radiograph is usually obtained in which projection?
A. AP only
B. PA and lateral
C. Oblique only
D. Decubitus only
Correct Answer: B. PA and lateral
