ARRT Lower Extremity Procedures 2

Question 1

Which projection of the knee best demonstrates the fibular head free of superimposition over the tibia?

Accepted Answer

Medial oblique projection

Answer

The medial oblique (internal rotation) projection of the knee projects the fibular head free of tibial superimposition.

Question 2

For a lateral projection of the ankle, the patient's foot should be dorsiflexed to approximately what angle to place the long axis of the foot perpendicular to the leg?

Accepted Answer

90 degrees

Answer

Dorsiflexing the foot to 90 degrees (a right angle to the leg) ensures a true lateral ankle projection without distortion.

Question 3

The AP axial projection of the foot (Béclère method) is used primarily to demonstrate which structure?

Accepted Answer

Sesamoid bones of the great toe

Answer

The Béclère method uses a tangential projection to visualize the sesamoid bones beneath the first metatarsophalangeal joint.

Question 4

When performing a bilateral weight-bearing AP projection of the knees for alignment assessment, the central ray is directed to:

Accepted Answer

A point 1 inch below the apex of the patella at 5-7 degrees caudad

Answer

For weight-bearing knee alignment, the CR is angled 5–7 degrees caudad directed to 1 inch below the patellar apex to open the joint space.

Question 5

For the lateral projection of the calcaneus, the central ray is directed:

Accepted Answer

To the mid-calcaneus perpendicular to the IR

Answer

For the calcaneus lateral, the CR is perpendicular to the IR directed to the mid-calcaneus to avoid distortion.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT Lower Extremity Procedures 2