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CH 37 RAD 170
AEC
Question | Answer |
---|---|
AEC was introduced in 1942 by _____________. | Russell H. Morgan |
The single function of an AEC is to eliminate the need for the radiographer to set an exposure ____. | time |
During the use of AEC, ___ and ____ may still be set manually. | mA; kVp |
AEC provide diagnostic quality exposures only for structures positioned directly above the _____ _____. | ionization chambers |
The art of using AEC is the art of ______. | positioning |
All AEC systems permit the adjustment of the amount of ______ necessary to send the exposure termination signal. | radiation |
The ____ controls should not be used to compensate for patient part thickness or kVp changes. | density (*AEC does this automatically*) |
Poor positioning skills result in an _____ repeat rate when using AEC. | increased |
AEC problems with subject density and contrast occur whenever an ____ density is present or when an ____ density is lacking. | unexpected; expected |
Collimation located close to activated chambers should be ______. | avoided |
The ____ ____ _____ 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 |
The backup time should be set at ____ percent of the anticipated manual exposure time. | 150 |
Federal law requires automatic termination at ____ mAs when working above ___ kVp. | 600; 50 |
______ combine an AEC system with a technique chart that is computerized to correspond to anatomical procedures. | Anatomically programmed radiography (APR) |
A manual technique will always provide a precisely _______ exposure. | repeatable |