Which of the Following Beam Restricting Devices Is Best at Limiting

question 10

Multiple Choice

Which of the following beam restricting devices is best at limiting unsharpness surrounding the radiographic image?

• A) Variable aperture collimator
• B) Cylinder cone
• C) Aperture diaphragm
• D) Focused grid

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Definitions:

Higher-Order Conditioning

A conditioning process where a stimulus that's associated with a conditioned stimulus also becomes a conditioned stimulus itself.

Spontaneous Recovery

The reappearance of an extinguished response (in a weaker form) when an organism is exposed to the original conditioned stimulus following a rest period.

Extinction

In behavioral psychology, the process by which a conditioned response decreases in frequency and eventually disappears after the conditioned stimulus is repeatedly presented without the unconditioned stimulus.

Conditioned Response

A learned response to a previously neutral stimulus that becomes associated with a significant stimulus.