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Concerning exposure controls: a. Automatic exposure control (AEC) can be varied to adjust the optical density of the film b. A faulty AEC detector will usually result in significant overexposure of the patient c. AEC is more likely to ensure the correct exposure when used with collimation d. AEC typically uses five ionization chambers e. All ionization chambers must be used simultaneously |
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Answer» a. True. The operator can adjust the AEC to produce an image of a certain optical density, known as the density setting. b. False. This should be prevented by a back-up timer, which terminates the exposure if the AEC fails to do so, usually when 150% of expected manual exposure is reached. c. True. d. False. There are usually three chambers covering different areas of the film. e. False. The operator can select which chambers to use depending on the projection. |
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