RADT questions with
correct answers
Section A: General Radiography
Q: What is the primary purpose of collimation in radiography?
A: To limit the x-ray beam size and reduce patient exposure.
Q: Which of the following controls the quality of the x-ray beam?
A: kVp (kilovoltage peak).
Q: Increasing mAs will result in:
A: Increased image density (brightness decreases on the image).
Q: What is the standard unit of radiation absorbed dose?
A: Gray (Gy).
Q: The inverse square law relates to what principle?
A: Intensity of radiation decreases proportionally to the square of the distance from
the source.
Q: What is the main purpose of a grid in radiography?
A: To reduce scatter radiation reaching the image receptor.
Q: What type of radiation is produced when an outer-shell electron fills an inner-
shell vacancy?
, A: Characteristic radiation.
Q: Which of the following tissues is most radiosensitive?
A: Bone marrow.
Q: The protective lead apron should have a minimum lead equivalency of:
A: 0.5 mm Pb.
Q: What does ALARA stand for?
A: As Low As Reasonably Achievable.
Section B: Positioning and Procedures
Q: The AP chest projection is NOT used routinely because:
A: The heart appears magnified due to increased OID (object-to-image distance).
Q: For an AP supine abdomen (KUB), the central ray is directed to:
A: The level of the iliac crests.
Q: What is the purpose of a lateral decubitus position for the abdomen?
A: To demonstrate air-fluid levels.
Q: The Waters method is used to visualize the:
A: Maxillary sinuses.
Q: The oblique hand projection best demonstrates the:
A: Metacarpophalangeal joints.
Section C: Radiation Protection & Patient Care
Q: What should you do first if a patient collapses during an exam?
A: Check for responsiveness and call for help.
correct answers
Section A: General Radiography
Q: What is the primary purpose of collimation in radiography?
A: To limit the x-ray beam size and reduce patient exposure.
Q: Which of the following controls the quality of the x-ray beam?
A: kVp (kilovoltage peak).
Q: Increasing mAs will result in:
A: Increased image density (brightness decreases on the image).
Q: What is the standard unit of radiation absorbed dose?
A: Gray (Gy).
Q: The inverse square law relates to what principle?
A: Intensity of radiation decreases proportionally to the square of the distance from
the source.
Q: What is the main purpose of a grid in radiography?
A: To reduce scatter radiation reaching the image receptor.
Q: What type of radiation is produced when an outer-shell electron fills an inner-
shell vacancy?
, A: Characteristic radiation.
Q: Which of the following tissues is most radiosensitive?
A: Bone marrow.
Q: The protective lead apron should have a minimum lead equivalency of:
A: 0.5 mm Pb.
Q: What does ALARA stand for?
A: As Low As Reasonably Achievable.
Section B: Positioning and Procedures
Q: The AP chest projection is NOT used routinely because:
A: The heart appears magnified due to increased OID (object-to-image distance).
Q: For an AP supine abdomen (KUB), the central ray is directed to:
A: The level of the iliac crests.
Q: What is the purpose of a lateral decubitus position for the abdomen?
A: To demonstrate air-fluid levels.
Q: The Waters method is used to visualize the:
A: Maxillary sinuses.
Q: The oblique hand projection best demonstrates the:
A: Metacarpophalangeal joints.
Section C: Radiation Protection & Patient Care
Q: What should you do first if a patient collapses during an exam?
A: Check for responsiveness and call for help.
