Radiologic Technologist EXAM QUESTIONS AND
CORRECT ANSWERS VEIFIED ANSWERS PLUS
RAIONALES 2025/2026
1. Which of the following are considered ionizing radiation?
A. X-rays
B. Gamma rays
C. Ultraviolet rays
D. Infrared rays
Correct Answer: A, B
Rationale: X-rays and gamma rays have enough energy to ionize atoms, whereas ultraviolet and
infrared are non-ionizing at typical exposure levels.
2. What is the primary purpose of a grid in radiography?
A. Reduce scatter radiation
B. Enhance image contrast
C. Increase patient dose
D. Support the patient
Correct Answer: A, B
Rationale: Grids absorb scattered radiation, which improves image contrast. While grids slightly
increase patient dose, that is not their primary purpose.
3. What are common imaging modalities used in diagnostic radiology?
A. CT scan
B. MRI
C. Ultrasound
D. PET scan
Correct Answer: A, B, C, D
Rationale: All these modalities are used for diagnostic imaging, though MRI and ultrasound do
not use ionizing radiation.
4. Which factors affect radiographic density?
A. kVp (kilovoltage peak)
B. mAs (milliampere-seconds)
,C. Focal spot size
D. SID (source-to-image distance)
Correct Answer: A, B, D
Rationale: kVp, mAs, and SID directly affect the amount of radiation reaching the image
receptor, influencing density; focal spot size affects sharpness, not density.
5. What are the main components of an X-ray tube?
A. Cathode
B. Anode
C. Collimator
D. Tube housing
Correct Answer: A, B
Rationale: The cathode produces electrons, and the anode is the target where X-rays are
generated. Collimator and tube housing are external components.
6. Which are appropriate radiation protection measures?
A. Lead aprons
B. Time, distance, shielding
C. Maximizing exposure
D. Gonadal shielding
Correct Answer: A, B, D
Rationale: Radiation safety is achieved by minimizing time, maximizing distance, using shielding,
and applying protective devices.
7. Which of the following can cause motion blur in an X-ray image?
A. Patient movement
B. Long exposure time
C. Low mAs
D. High kVp
Correct Answer: A, B
Rationale: Patient movement during exposure and long exposure times result in motion blur,
reducing image quality.
8. What is the purpose of contrast media in radiology?
A. Increase tissue visibility
B. Reduce patient exposure
C. Enhance organ visualization
D. Eliminate artifacts
Correct Answer: A, C
, Rationale: Contrast media improve visualization of soft tissues and structures that are otherwise
difficult to differentiate.
9. Which are typical patient preparation steps for abdominal X-rays?
A. Fasting
B. Removing metallic objects
C. Administering contrast agents
D. Breathing exercises
Correct Answer: A, B, C
Rationale: Fasting reduces bowel content, metallic objects can obscure anatomy, and contrast
may be used for better visualization.
10. Which factors influence radiographic contrast?
A. kVp
B. Filtration
C. Patient thickness
D. Image receptor type
Correct Answer: A, B, C, D
Rationale: Contrast depends on energy (kVp), filtration, patient anatomy, and receptor
sensitivity.
11. What are the common types of image receptors in radiography?
A. Film-screen
B. Digital (DR/CR)
C. Fluoroscopy
D. Computed tomography detectors
Correct Answer: A, B
Rationale: Film-screen and digital receptors are used for conventional radiography. Fluoroscopy
and CT are separate imaging modalities.
12. Which X-ray projections are used for chest imaging?
A. PA (posteroanterior)
B. AP (anteroposterior)
C. Lateral
D. Oblique
Correct Answer: A, B, C
Rationale: PA, AP, and lateral views are standard chest projections; oblique views are less
common for routine chest imaging.
CORRECT ANSWERS VEIFIED ANSWERS PLUS
RAIONALES 2025/2026
1. Which of the following are considered ionizing radiation?
A. X-rays
B. Gamma rays
C. Ultraviolet rays
D. Infrared rays
Correct Answer: A, B
Rationale: X-rays and gamma rays have enough energy to ionize atoms, whereas ultraviolet and
infrared are non-ionizing at typical exposure levels.
2. What is the primary purpose of a grid in radiography?
A. Reduce scatter radiation
B. Enhance image contrast
C. Increase patient dose
D. Support the patient
Correct Answer: A, B
Rationale: Grids absorb scattered radiation, which improves image contrast. While grids slightly
increase patient dose, that is not their primary purpose.
3. What are common imaging modalities used in diagnostic radiology?
A. CT scan
B. MRI
C. Ultrasound
D. PET scan
Correct Answer: A, B, C, D
Rationale: All these modalities are used for diagnostic imaging, though MRI and ultrasound do
not use ionizing radiation.
4. Which factors affect radiographic density?
A. kVp (kilovoltage peak)
B. mAs (milliampere-seconds)
,C. Focal spot size
D. SID (source-to-image distance)
Correct Answer: A, B, D
Rationale: kVp, mAs, and SID directly affect the amount of radiation reaching the image
receptor, influencing density; focal spot size affects sharpness, not density.
5. What are the main components of an X-ray tube?
A. Cathode
B. Anode
C. Collimator
D. Tube housing
Correct Answer: A, B
Rationale: The cathode produces electrons, and the anode is the target where X-rays are
generated. Collimator and tube housing are external components.
6. Which are appropriate radiation protection measures?
A. Lead aprons
B. Time, distance, shielding
C. Maximizing exposure
D. Gonadal shielding
Correct Answer: A, B, D
Rationale: Radiation safety is achieved by minimizing time, maximizing distance, using shielding,
and applying protective devices.
7. Which of the following can cause motion blur in an X-ray image?
A. Patient movement
B. Long exposure time
C. Low mAs
D. High kVp
Correct Answer: A, B
Rationale: Patient movement during exposure and long exposure times result in motion blur,
reducing image quality.
8. What is the purpose of contrast media in radiology?
A. Increase tissue visibility
B. Reduce patient exposure
C. Enhance organ visualization
D. Eliminate artifacts
Correct Answer: A, C
, Rationale: Contrast media improve visualization of soft tissues and structures that are otherwise
difficult to differentiate.
9. Which are typical patient preparation steps for abdominal X-rays?
A. Fasting
B. Removing metallic objects
C. Administering contrast agents
D. Breathing exercises
Correct Answer: A, B, C
Rationale: Fasting reduces bowel content, metallic objects can obscure anatomy, and contrast
may be used for better visualization.
10. Which factors influence radiographic contrast?
A. kVp
B. Filtration
C. Patient thickness
D. Image receptor type
Correct Answer: A, B, C, D
Rationale: Contrast depends on energy (kVp), filtration, patient anatomy, and receptor
sensitivity.
11. What are the common types of image receptors in radiography?
A. Film-screen
B. Digital (DR/CR)
C. Fluoroscopy
D. Computed tomography detectors
Correct Answer: A, B
Rationale: Film-screen and digital receptors are used for conventional radiography. Fluoroscopy
and CT are separate imaging modalities.
12. Which X-ray projections are used for chest imaging?
A. PA (posteroanterior)
B. AP (anteroposterior)
C. Lateral
D. Oblique
Correct Answer: A, B, C
Rationale: PA, AP, and lateral views are standard chest projections; oblique views are less
common for routine chest imaging.
