CAMRT Radiography Practice Exam

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What is the primary purpose of a backup timer in radiographic exposures?

To enhance image contrast
To terminate the exposure in case of AEC failure
To manage patient motion
To adjust image brightness

The correct answer is: To terminate the exposure in case of AEC failure

The primary purpose of a backup timer in radiographic exposures is to terminate the exposure in case of AEC (Automatic Exposure Control) failure. This safety mechanism is essential because if the AEC fails to adequately measure the radiation reaching the image receptor, it could result in overexposure, potentially harming the patient or degrading the quality of the images. The backup timer acts as a failsafe, ensuring that the exposure will not exceed a predetermined time, which helps protect both the patient and the equipment. The other options, while related to imaging, do not accurately describe the function of the backup timer. Enhancing image contrast, managing patient motion, and adjusting image brightness are all important aspects of obtaining quality radiographic images, but they are not the specific role of the backup timer.