Which of the following statements regarding dental x-ray machine output consistency testing is correct?
A) It should be performed by a qualified expert only.
B) Multiple images that are identical in density and contrast indicate a failed test.
C) Each test film should be processed immediately after exposure.
D) It uses a step-wedge.
D
Explanation: A) A step-wedge is used to expose several films over a period of time. After processing, the films are compared to determine consistency in unit output.
B) A step-wedge is used to expose several films over a period of time. After processing, the films are compared to determine consistency in unit output.
C) A step-wedge is used to expose several films over a period of time. After processing, the films are compared to determine consistency in unit output.
D) A step-wedge is used to expose several films over a period of time. After processing, the films are compared to determine consistency in unit output.
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