ARRT Upper Extremity Procedures 3

Question 1

Which method is used to image the AC joints with and without weights to assess ligament integrity?

Accepted Answer

Rockwood method

Answer

The Rockwood method obtains bilateral AP AC joint views with the patient holding weights to stress the joint and reveal ligament disruption.

Question 2

For a PA projection of the hand, the central ray is directed to the:

Accepted Answer

Third MCP joint

Answer

The CR is centered to the third MCP joint for a PA hand projection to include all digits and carpals on the image.

Question 3

A fracture of the hook of the hamate is best demonstrated by which special projection?

Accepted Answer

Carpal canal (Gaynor-Hart) view

Answer

The carpal canal (Gaynor-Hart) projection projects the hook of the hamate in profile, making hamate hook fractures visible.

Question 4

The Stecher method for the scaphoid positions the hand in ulnar deviation and angles the CR:

Accepted Answer

20° toward the elbow (proximally)

Answer

The Stecher method angles the CR 20° toward the elbow (proximally) to better elongate and visualize the scaphoid through the wrist.

Question 5

Which projection of the shoulder requires the patient's arm abducted 90° with the elbow flexed and the CR directed through the axilla?

Accepted Answer

Inferosuperior axial (Lawrence method)

Answer

The inferosuperior axial (Lawrence method) places the CR through the axilla with the arm abducted to profile the humeral head in the glenoid.

ARRT - American Registry of Radiologic Technologists Practice Test