Chapter 6 X-Ray circuit and tube heat management – Flashcards

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