Chapter 6 X-Ray circuit and tube heat management – Flashcards
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Into what three sections (subcircuits) is the x-ray circuit divided?
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The low-voltage, filament, and high-voltage circuits
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Which of the following functions involve(s) the autotransformer?
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kVp selection
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Which of the following is the function of the autotransformer?
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Provides the means for kVp selection, provides compensation for fluctuations in the incoming line voltage, supplies power to the other parts of the x-ray circuit
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What is the purpose of the filament circuit?
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Supply and control the heat required by the X-ray tube filament for thermionic emission of electrons
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Which of the following reduces the voltage on the secondary side to provide an appropriate current to heat the filament?
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Step-down transformer
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Exposure times that are as low as 0.001 sec and are expressed in decimals are typical of a(n)
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Electronic timer
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The process of causing alternating current to flow in one direction only is called
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Rectification
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Which of the following is located on the high-voltage side of the x-ray circuit?
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X-ray tube
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Which of the following are true concerning high-frequency generators, as compared with standard single phase for x-ray generation?
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Provide more constant voltage across the X-ray tube, provide more homogeneity of the x-ray beam, require less exposure time to produce a given amount of exposure
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A series of warm-up exposures is made for the purpose of
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Preventing damage to the anode from the sudden heating
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To prolong the tube life, tubes should be operated at about __________ of capacity
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80%
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The maximum heat capacity of the anode of the X-ray tube is rated in terms of
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Heat units
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Which of the following is the formula to calculate the heat produced by an exposure made on a three-phase generator?
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MA x time (sec) x 1.35
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Which type of exposure timer is capable of shorter exposure times (1 msec or less)?
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Electronic timer
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What is the difference between an electronic timer and a synchronous timer?
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Electronic timers are capable of shorter exposure times than synchronous timers
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What device terminates the exposure time after an exact amount of exposure for a given body part has been achieved?
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Automatic exposure control
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Which type of AEC device terminates the exposure after a specific quantity of light has been detected?
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Phototimer
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What is a phototimer?
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A type of AEC device that terminates the exposure after a specific quantity of light has been detected
