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RADT 109 - M06 - Chapter 27 test with 100- correct answers.
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RADT 109 - M06 - Chapter 27 test with 100- correct answers.
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RADT 109 - M06 - Chapter 27test with 100% correct answers
What are the parts of the automatic exposure circuit in order?
Ion Chamber
Capacitor
Thyratron for density control
Magnetic relay switch
What is the purpose of the Ion Chamber?
it can be placed within a x-ray tabletop in front of the Bucky tray or
detection plate without creating an artifact on images.
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What is the purpose of the capacitor?
device to store up electrical charge
What is the purpose of the thyratron for density control?
presets the amount of charge this capacitor will hold
What is the purpose of the magnetic relay switch?
, pull open exposure switch
What is still necessary for the radiographer to set when AEC is being
used?
optimum kVp and optimum mA as well as the detector cell
configuration
What is the definition for the minimum response time (MRT)
When using AEC if too high and milliampere station is used, the
patient will receive too much exposure because of MRT.
What is the definition for the minimum response time (MRT
MA high enough at a given focal spot to minimize motion, but not so
high that resulting exposure times are shorter than the MRT.
What should the backup time be set to?
No more than double the expected exposure.
Why should pre-set back-up times be overridden by departments?
Because the preset backup timers are too excessive.
What is the range of a typical minimum response time?
From 0.002 seconds for state-of-the-art equipment to 0.02 seconds
for older units
When does the AEC shut off the exposure?
When the thyratron activates the electromagnet.
What are the AEC limitations?
AEC should not be used on anatomy that is too small or narrow to
completely cover at least one whole detector cell.
What is the intensity control station?
As long as the AEC circuit is functioning properly the intensity
(density) control should only need to be used infrequently
what is the minimum change rule?
35% change
what is the AEC recommended for prosthetics?
The AEC should never be used with any type of radiopaque surgical
apparatus, orthopedic corrective devices, extensive orthodontic
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