Extremities Limited Scope Practice Exam

Which of the following must be done to decrease the OID for a PA wrist projection?

Fingers flexed Fingers extended Elbow flexed 90 Fingers separated

Correct Answer:

Fingers flexed

Explanation:

To decrease the object-to-image distance, place the hand so the wrist sits as close to the image receptor as possible. Curling the fingers into a fist makes the hand more compact, bringing the wrist nearer to the IR and thus reducing OID. Extending the fingers would lift the hand away from the receptor, increasing OID, and spreading the fingers would also add distance between the wrist and the IR. The elbow position doesn’t by itself change how close the wrist is to the IR when the forearm is supported, so it’s not the primary way to reduce OID. So, flexing the fingers is the best way to minimize OID in a PA wrist projection.

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