GXMO GXMO Anatomy and Radiographic Procedures 2 — Questions and Answers
Question 1: For a lateral wrist projection, the wrist is positioned so that the ulna and radius are:
- Superimposed (Correct answer)
- Separated by 2 cm
- At 45-degree oblique
- Perpendicular to the IR
Correct answer: Superimposed
In the lateral wrist projection, the ulna and radius should be directly superimposed to confirm true lateral positioning.
Question 2: The Caldwell projection (PA axial) of the skull uses a tube angle of:
- 15 degrees caudad (Correct answer)
- 15 degrees cephalad
- 30 degrees caudad
- 0 degrees (perpendicular)
Correct answer: 15 degrees caudad
The Caldwell projection uses a 15-degree caudad angle to project the petrous ridges into the lower one-third of the orbits.
Question 3: Which body position is used to demonstrate free air in the peritoneal cavity when a patient cannot stand?
- Left lateral decubitus (Correct answer)
- Right lateral decubitus
- Trendelenburg
- Prone
Correct answer: Left lateral decubitus
The left lateral decubitus position places the right side up so free air rises and is visible against the liver, away from the gastric bubble.
Question 4: The Towne projection (AP axial) of the skull is used primarily to demonstrate the:
- Occipital bone and dorsum sellae (Correct answer)
- Frontal sinuses
- Maxillary sinuses
- Nasal bones
Correct answer: Occipital bone and dorsum sellae
The Towne projection demonstrates the occipital bone, foramen magnum, and dorsum sellae by angling the central ray 30–35 degrees caudad.
Question 5: For an AP pelvis projection, the patient's feet and lower limbs should be:
- Internally rotated 15–20 degrees (Correct answer)
- Externally rotated 15–20 degrees
- In neutral position
- Flexed at the knees
Correct answer: Internally rotated 15–20 degrees
Internal rotation of 15–20 degrees places the femoral necks parallel to the image receptor, providing an unobstructed view of the femoral necks.
Question 6: Which view of the foot best demonstrates the longitudinal arch?
- Weight-bearing lateral (Correct answer)
- Non-weight-bearing AP
- Medial oblique
- Dorsoplantar
Correct answer: Weight-bearing lateral
The weight-bearing lateral projection of the foot demonstrates the true height and shape of the longitudinal arch under normal loading conditions.
GXMO GXMO Anatomy and Radiographic Procedures 2
For a lateral wrist projection, the wrist is positioned so that the ulna and radius are: