ARRT Radiography Certification
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. The primary purpose of a grid in radiography is to:
A. Increase image magnification
B. Reduce patient dose
C. Improve image contrast
D. Decrease scatter radiation
C. Improve image contrast
Rationale: Grids absorb scattered radiation before it reaches the image
receptor, enhancing image contrast.
2. Which of the following is the most radiosensitive tissue?
A. Muscle
, B. Nerve
C. Gonads
D. Bone
C. Gonads
Rationale: Gonads contain germ cells, which are highly sensitive to ionizing
radiation according to the Law of Bergonie and Tribondeau.
3. What is the purpose of collimation in radiography?
A. Increase beam intensity
B. Reduce scatter radiation and patient dose
C. Increase exposure time
D. Improve film speed
B. Reduce scatter radiation and patient dose
Rationale: Collimation limits the x-ray beam to the area of interest,
reducing scatter and unnecessary radiation exposure.
4. Which interaction is the primary contributor to image formation in
diagnostic radiography?
A. Compton scattering
B. Photoelectric effect
C. Pair production
D. Photodisintegration
B. Photoelectric effect
Rationale: Photoelectric interactions deposit all energy in the patient and
,are more likely in higher atomic number tissues, contributing to
radiographic contrast.
5. Which of the following is measured in sieverts (Sv)?
A. Exposure
B. Absorbed dose
C. Equivalent dose
D. Activity
C. Equivalent dose
Rationale: Equivalent dose accounts for the type of radiation and its
biological effect on tissue and is measured in sieverts.
6. In digital radiography, pixel size primarily affects:
A. Contrast resolution
B. Spatial resolution
C. Noise
D. Magnification
B. Spatial resolution
Rationale: Smaller pixels capture more detail, improving spatial resolution.
7. The anode heel effect results in:
A. Higher intensity at the cathode side of the x-ray tube
B. Uniform beam intensity
C. Higher intensity at the anode side
D. Reduced focal spot size
, A. Higher intensity at the cathode side of the x-ray tube
Rationale: X-rays emitted at the anode side pass through more material,
reducing intensity; cathode side is more intense.
8. Which of the following is true regarding milliampere-seconds (mAs)?
A. It controls beam quality
B. It controls image contrast
C. It controls radiation quantity
D. It controls image resolution
C. It controls radiation quantity
Rationale: mAs is the product of tube current and exposure time, directly
affecting the number of x-ray photons produced.
9. The inverse square law states that radiation intensity is:
A. Directly proportional to distance
B. Inversely proportional to distance
C. Inversely proportional to the square of distance
D. Unrelated to distance
C. Inversely proportional to the square of distance
Rationale: As distance from the source doubles, intensity decreases to one-
fourth.
10. A radiograph appears too light. Which is the most likely cause?
A. Increased mAs
B. Increased kVp
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. The primary purpose of a grid in radiography is to:
A. Increase image magnification
B. Reduce patient dose
C. Improve image contrast
D. Decrease scatter radiation
C. Improve image contrast
Rationale: Grids absorb scattered radiation before it reaches the image
receptor, enhancing image contrast.
2. Which of the following is the most radiosensitive tissue?
A. Muscle
, B. Nerve
C. Gonads
D. Bone
C. Gonads
Rationale: Gonads contain germ cells, which are highly sensitive to ionizing
radiation according to the Law of Bergonie and Tribondeau.
3. What is the purpose of collimation in radiography?
A. Increase beam intensity
B. Reduce scatter radiation and patient dose
C. Increase exposure time
D. Improve film speed
B. Reduce scatter radiation and patient dose
Rationale: Collimation limits the x-ray beam to the area of interest,
reducing scatter and unnecessary radiation exposure.
4. Which interaction is the primary contributor to image formation in
diagnostic radiography?
A. Compton scattering
B. Photoelectric effect
C. Pair production
D. Photodisintegration
B. Photoelectric effect
Rationale: Photoelectric interactions deposit all energy in the patient and
,are more likely in higher atomic number tissues, contributing to
radiographic contrast.
5. Which of the following is measured in sieverts (Sv)?
A. Exposure
B. Absorbed dose
C. Equivalent dose
D. Activity
C. Equivalent dose
Rationale: Equivalent dose accounts for the type of radiation and its
biological effect on tissue and is measured in sieverts.
6. In digital radiography, pixel size primarily affects:
A. Contrast resolution
B. Spatial resolution
C. Noise
D. Magnification
B. Spatial resolution
Rationale: Smaller pixels capture more detail, improving spatial resolution.
7. The anode heel effect results in:
A. Higher intensity at the cathode side of the x-ray tube
B. Uniform beam intensity
C. Higher intensity at the anode side
D. Reduced focal spot size
, A. Higher intensity at the cathode side of the x-ray tube
Rationale: X-rays emitted at the anode side pass through more material,
reducing intensity; cathode side is more intense.
8. Which of the following is true regarding milliampere-seconds (mAs)?
A. It controls beam quality
B. It controls image contrast
C. It controls radiation quantity
D. It controls image resolution
C. It controls radiation quantity
Rationale: mAs is the product of tube current and exposure time, directly
affecting the number of x-ray photons produced.
9. The inverse square law states that radiation intensity is:
A. Directly proportional to distance
B. Inversely proportional to distance
C. Inversely proportional to the square of distance
D. Unrelated to distance
C. Inversely proportional to the square of distance
Rationale: As distance from the source doubles, intensity decreases to one-
fourth.
10. A radiograph appears too light. Which is the most likely cause?
A. Increased mAs
B. Increased kVp
