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Concerning quality assurance in film-screen radiography: a. It is insufficient to test only the film speed and contrast index b. A gradual change in the speed of the film is more likely to be related to problems during the processing of film than to problems with the film batch c. Screens should be changed routinely at yearly intervalsd. The tube potential may be tested by assessing the kV of the X-ray beam e. X-ray output should increase with increasing kV |
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Answer» a. True. The base plus fog level and maximum density (Dmax) also need to be tested. These may be affected by long-term storage of the film at incorrect temperatures. b. True. c. False. There is no set time as to when they need to be changed. When the sensitivity of a screen has reduced by 20%, then generally it should be changed. This may be tested by producing test films at set kV and mAs values and comparing the optical density produced. d. True. Although the tube potential is not usually measured directly, an electronic meter may be used to demonstrate the kV and its variation with the exposure time using an oscilloscope. e. True. |
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