How Is a Patient Positioned for a PA Wrist Projection

question 24

Multiple Choice

How is a patient positioned for a PA wrist projection to superimpose the anterior and posterior margins of the distal radius and obtain open radioscaphoid and radiolunate joint spaces?

• A) Align the third metacarpal with the forearm.
• B) Ulnar-flex the wrist.
• C) Depress the proximal forearm.
• D) Flex the hand until the metacarpals are at a 10- to 15-degree angle with the IR.

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Definitions:

Rotor Bars

Conductive bars typically found in the rotor of an induction motor, which carry current to produce a magnetic field that interacts with the stator field.

Starting Torque

The torque an electric motor generates to start a load moving.

Selsyn Motors

Special motors that can be employed to provide angular feedback information or control the rotation of devices at a distance.

Voltage

The measure of electrical potential difference between two points in a circuit, driving current from places of high potential to low potential.