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Regarding patient dose in radiography: a. The ratio of entrance surface dose (ESD) to exit dose is similar in most radio graphic examinations b. The film dose required to produce an image in film-screen radiography is in the range of 0.2–0.5 μGy c. Increasing mAs increases the exit dose and ESD proportionately d. Increasing the tube kV increases the ratio of ESD to the exit dose e. Increasing filtration reduces the ratio of ESD to the exit dose |
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Answer» a. False. Depending on examination type, this ratio may vary from 10 (for a PA chest X-ray) to over 5000 (in the case of a lateral lumbar spine radiograph). b. False. A dose of approximately 3 μGy is required. c. True. d. False. With increased kV, the X-ray beam is more penetrating and a lower entrance dose is required to produce the same exit dose. In general, the highest peak kV (kVp) producing acceptable image contrast should be used. e. True. This is because increasing filtration makes the beam more penetrating. |
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