LOUISIANA MEDICAL RADIOLOGIC TECHNOLOGY
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2027 |INSTANT
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1. What is the primary purpose of a radiographic grid?
A. Increase image magnification
B. Reduce scatter radiation reaching the image receptor
C. Increase patient motion
D. Reduce focal spot size
Rationale: A grid absorbs a significant portion of scattered
radiation before it reaches the image receptor, improving
image contrast.
Correct Answer: B. Reduce scatter radiation reaching the image
receptor
2. Which interaction is primarily responsible for producing
diagnostic radiographic contrast in the patient?
A. Compton scattering
B. Pair production
C. Photoelectric absorption
D. Photodisintegration
Rationale: Photoelectric absorption contributes substantially to
subject contrast because it depends strongly on tissue
,composition and photon energy.
Correct Answer: C. Photoelectric absorption
3. Which factor primarily controls the quantity of x-rays
produced?
A. kVp
B. mAs
C. SID
D. Filtration
Rationale: mAs directly controls the number of x-ray photons
produced.
Correct Answer: B. mAs
4. What is the main function of the cathode in an x-ray tube?
A. Produce x-rays directly
B. Accelerate electrons
C. Supply electrons for tube current
D. Absorb scattered radiation
Rationale: The cathode contains the filament, which emits
electrons through thermionic emission.
Correct Answer: C. Supply electrons for tube current
5. Which component of the x-ray tube is the target struck by
electrons?
A. Filament
B. Anode
C. Rotor
D. Stator
,Rationale: Electrons travel from the cathode to the anode
target, where x-rays are produced.
Correct Answer: B. Anode
6. What is the primary purpose of collimation?
A. Increase patient dose
B. Restrict the x-ray beam to the area of interest
C. Increase scatter production
D. Increase magnification
Rationale: Collimation limits the irradiated field, reducing
unnecessary patient exposure and scatter.
Correct Answer: B. Restrict the x-ray beam to the area of
interest
7. Which unit is used to measure absorbed radiation dose?
A. Gray
B. Sievert
C. Coulomb
D. Roentgen
Rationale: The gray (Gy) is the SI unit for absorbed dose.
Correct Answer: A. Gray
8. Which unit is used for equivalent and effective radiation
dose?
A. Gray
B. Sievert
C. Tesla
D. Becquerel
, Rationale: The sievert (Sv) accounts for radiation type and
tissue sensitivity when applicable.
Correct Answer: B. Sievert
9. Which principle states that radiation exposure should be
kept as low as reasonably achievable?
A. Inverse square law
B. ALARA
C. Reciprocity law
D. Heel effect
Rationale: ALARA means “as low as reasonably achievable” and
is a fundamental radiation protection principle.
Correct Answer: B. ALARA
10. What happens to radiation intensity when the distance
from the source is doubled?
A. It doubles
B. It becomes four times greater
C. It becomes one-fourth as great
D. It remains unchanged
Rationale: According to the inverse square law, intensity is
inversely proportional to the square of the distance.
Correct Answer: C. It becomes one-fourth as great
11. Which method provides the greatest protection from an x-
ray source?
A. Increasing exposure time
B. Decreasing distance
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2027 |INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a radiographic grid?
A. Increase image magnification
B. Reduce scatter radiation reaching the image receptor
C. Increase patient motion
D. Reduce focal spot size
Rationale: A grid absorbs a significant portion of scattered
radiation before it reaches the image receptor, improving
image contrast.
Correct Answer: B. Reduce scatter radiation reaching the image
receptor
2. Which interaction is primarily responsible for producing
diagnostic radiographic contrast in the patient?
A. Compton scattering
B. Pair production
C. Photoelectric absorption
D. Photodisintegration
Rationale: Photoelectric absorption contributes substantially to
subject contrast because it depends strongly on tissue
,composition and photon energy.
Correct Answer: C. Photoelectric absorption
3. Which factor primarily controls the quantity of x-rays
produced?
A. kVp
B. mAs
C. SID
D. Filtration
Rationale: mAs directly controls the number of x-ray photons
produced.
Correct Answer: B. mAs
4. What is the main function of the cathode in an x-ray tube?
A. Produce x-rays directly
B. Accelerate electrons
C. Supply electrons for tube current
D. Absorb scattered radiation
Rationale: The cathode contains the filament, which emits
electrons through thermionic emission.
Correct Answer: C. Supply electrons for tube current
5. Which component of the x-ray tube is the target struck by
electrons?
A. Filament
B. Anode
C. Rotor
D. Stator
,Rationale: Electrons travel from the cathode to the anode
target, where x-rays are produced.
Correct Answer: B. Anode
6. What is the primary purpose of collimation?
A. Increase patient dose
B. Restrict the x-ray beam to the area of interest
C. Increase scatter production
D. Increase magnification
Rationale: Collimation limits the irradiated field, reducing
unnecessary patient exposure and scatter.
Correct Answer: B. Restrict the x-ray beam to the area of
interest
7. Which unit is used to measure absorbed radiation dose?
A. Gray
B. Sievert
C. Coulomb
D. Roentgen
Rationale: The gray (Gy) is the SI unit for absorbed dose.
Correct Answer: A. Gray
8. Which unit is used for equivalent and effective radiation
dose?
A. Gray
B. Sievert
C. Tesla
D. Becquerel
, Rationale: The sievert (Sv) accounts for radiation type and
tissue sensitivity when applicable.
Correct Answer: B. Sievert
9. Which principle states that radiation exposure should be
kept as low as reasonably achievable?
A. Inverse square law
B. ALARA
C. Reciprocity law
D. Heel effect
Rationale: ALARA means “as low as reasonably achievable” and
is a fundamental radiation protection principle.
Correct Answer: B. ALARA
10. What happens to radiation intensity when the distance
from the source is doubled?
A. It doubles
B. It becomes four times greater
C. It becomes one-fourth as great
D. It remains unchanged
Rationale: According to the inverse square law, intensity is
inversely proportional to the square of the distance.
Correct Answer: C. It becomes one-fourth as great
11. Which method provides the greatest protection from an x-
ray source?
A. Increasing exposure time
B. Decreasing distance
