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What is AED?
Automatic exposure device.
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What does AEC have that non-AEC lacks?
Cell locations are given but time settings are eliminated.
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What percentage is the backup time for AEC usually set at?
150%
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What can reduce the number of repeated images and produce excellent images?
A proper clinical history.
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Which of the following is not a typical AEC density control label? -3, -2, -1, 0.5, 0, 1, 2, 3.
0.5 AEC density control label.
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What detector(s) is/are used for an AP Hip?
Center detector only used.
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What is AEC?
Ionization chamber is designed for a single purpose, and to eliminate the need for a radiographer to set an exposure time.
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The operational amplifier was dividing the incoming voltage by all three cells but only two cells were contributing to the signal due to:
The resultant image being slightly overexposed.
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Is the relationship between receptor speed and mAs inverse or direct?
Inverse.
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What are phototimers?
Early versions of AEC technology.
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The signal is averaged when:
More than one ionization chamber is used.
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What is the length of time necessary for the AEC to respond to the ionization and send a signal to terminate the exposure?
Minimum response time.
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The exposure maintenance formula is:
Density-distance relationship.
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What detector(s) is/are used for a PA Chest?
Left and right detectors are used.
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When can a radiographer override the suggested technique?
Patient condition, pathology, or other factors.
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What is installed when the capacitor is set up by the equipment technician to terminate the exposure when it has received a specific charge?
Automatic exposure device (AED) is installed.
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What does AEC eliminate?
It eliminates time.
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What detector(s) is/are used for an AP abdomen?
All three detectors are used.
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Should tight collimation be done or not be done near ionization chambers?
Tight collimation should not be done.
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It takes longer for enough radiation to exit the spine and strike the detectors than it does for the adjacent soft tissue structures which causes _________ of the soft tissue structures.
Overexposure.
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