Radiography Exam ARRT Radiography 2 — Questions and Answers
Question 1: Which radiographic projection best demonstrates the carpal tunnel?
- PA wrist
- Lateral wrist
- Tangential (inferosuperior) projection (Correct answer)
- Oblique wrist
Correct answer: Tangential (inferosuperior) projection
The tangential (inferosuperior) carpal canal projection profiles the carpal tunnel and its contents.
Question 2: Scattered radiation reaching the image receptor is primarily reduced by using a:
- Higher kVp technique
- Smaller focal spot
- Radiographic grid (Correct answer)
- Longer SID
Correct answer: Radiographic grid
A radiographic grid absorbs scattered photons before they reach the image receptor, improving image contrast.
Question 3: Which ionizing radiation interaction with matter is responsible for most scattered radiation in diagnostic imaging?
- Photoelectric effect
- Compton scattering (Correct answer)
- Pair production
- Coherent (classical) scattering
Correct answer: Compton scattering
Compton scattering is the predominant interaction in diagnostic energy ranges and produces most clinically relevant scatter.
Question 4: A patient's arm is externally rotated 45° for an AP oblique projection of the elbow. Which structure is best demonstrated?
- Radial head and capitulum (Correct answer)
- Coronoid process and trochlea
- Olecranon fossa
- Radial tuberosity
Correct answer: Radial head and capitulum
The AP oblique elbow with external rotation (lateral oblique) profiles the radial head free of superimposition with the ulna.
Question 5: Which of the following is the recommended lead apron thickness for gonadal shielding in radiography?
- 0.10 mm Pb equivalent
- 0.25 mm Pb equivalent
- 0.50 mm Pb equivalent (Correct answer)
- 1.0 mm Pb equivalent
Correct answer: 0.50 mm Pb equivalent
A minimum of 0.50 mm lead equivalent is recommended for protective aprons used in diagnostic radiography.
Question 6: The PA chest radiograph is preferred over the AP projection primarily because it:
- Reduces patient dose significantly
- Decreases magnification of the heart (Correct answer)
- Eliminates scatter radiation
- Improves lung field visualization
Correct answer: Decreases magnification of the heart
With the patient facing the detector (PA), the heart is closer to the image receptor, reducing its geometric magnification.
Question 7: Which blood vessel is most susceptible to injury when performing a femoral artery puncture too far inferior?
- External iliac artery
- Profunda femoris artery (Correct answer)
- Popliteal artery
- Superficial femoral artery
Correct answer: Profunda femoris artery
The profunda femoris (deep femoral artery) branches from the common femoral just below the inguinal ligament; puncture below this level risks entering this vessel.
Radiography Exam ARRT Radiography 2
Which radiographic projection best demonstrates the carpal tunnel?