What is automatic exposure control quizlet?
What is automatic exposure control quizlet?
What is automatic exposure control quizlet?
terminates the exposure, preventing patient from being overexposed. What is the back up timer response time? 1 ms (0.001 second) The automatic exposure control (AEC) is a device that measures the quantity of radiation that reaches what structure? image receptor.
What is the primary purpose of using automatic exposure control?
Its function is to automatically terminate exposure when a preset amount of radiation has been detected. Automatic exposure control systems help to provide a consistent optical density/signal-to-noise ratio, regardless of patient-centric factors such as size and density.
What is AEC controls quizlet?
STUDY. Automatic Exposure Controls. A system used to consistently control the amount of radiation reaching the image receptor by terminating the length of exposure.
What is the principal function of the automatic exposure control quizlet?
What is the principal function of the automatic exposure control? To eliminate the need for the radiographer to set an exposure time.
What does automatic exposure control measure?
AEC is a radiographic density control device that terminates the exposure when a predetermined amount of radiation has been reached. Newer systems control kVp and mA as well as exposure time.
Why is backup time necessary when using an automatic exposure control?
Backup time should be set at 150% to 200% of the expected exposure time. This allows the properly used AEC system to terminate the exposure appropriately but protects the patient and tube from excessive exposure if a problem occurs.
Which type of detectors are most commonly used in automatic exposure control AEC system?
The more common type of AEC system uses ionization chambers. Regardless of the specific type of AEC system used, almost all systems use a set of three radiation-measuring detectors, arranged in some specific manner (Figure 13-1).
Which of the following are types of automatic exposure control AEC devices?
Two types of AEC devices are used: ionization chamber and solid-state diode. The first automatic exposure terminating device was the phototimer.
What is the length of time necessary for the AEC to respond to the ionization and send a signal to terminate the exposure?
AEC’s
| Question | Answer |
|---|---|
| this 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 |
| what is the minimum response time of modern AEC’s | 0.001 second |
| what should the backup time be set at | 150% |
| generators must shut off at ____ mAs above 50 kVp | 600 mAs |
Which of the following should be used when the configuration of the ionization chamber cells Cannot be adapted to the necessary positioning?
The density controls should be used when the configuration of the ionization chamber cells cannot be adapted to the necessary positioning—for example, when an image is produced that is slightly overexposed for the lung fields and a decrease in image receptor exposure is desired even though the patient and ionization …
How does an automatic exposure device work?
Automatic exposure control (AEC) is a device incorporated into radiographic and mammographic imaging systems. Its function is to automatically terminate exposure when a preset amount of radiation has been detected.