ARRT Upper Extremity Procedures 5

Question 1

On a correctly positioned lateral forearm radiograph, the distal radius and ulna should appear:

Accepted Answer

Superimposed at the distal radioulnar joint

Answer

A true lateral forearm shows slight superimposition of the distal radius and ulna at the distal radioulnar joint.

Question 2

Which wrist projection best demonstrates the pisiform free of superimposition?

Accepted Answer

Medial oblique (pronation) projection

Answer

The medial (internal) oblique wrist projection rotates the wrist 45° medially to project the pisiform clear of the triquetrum.

Question 3

For a PA projection of the clavicle, the CR is typically angled how many degrees cephalad?

Accepted Answer

15–30°

Answer

A 15–30° cephalad angulation projects the clavicle above the ribs and lung apex for better visualization.

Question 4

In a lateral projection of the elbow, the arm is flexed to:

Accepted Answer

90°

Answer

The elbow is flexed 90° for the lateral projection so the olecranon process is profiled and the joint is fully open.

Question 5

The Barton fracture of the wrist is defined as:

Accepted Answer

An intra-articular fracture of the dorsal or volar rim of the distal radius with carpal subluxation

Answer

A Barton fracture is an intra-articular shear fracture of the dorsal or volar rim of the distal radius associated with radiocarpal joint subluxation.

ARRT - American Registry of Radiologic Technologists Practice Test