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Image Prod Ch9

AEC/AED

QuestionAnswer
AEC will produce consistant density regardless of Patient Size or Pathological Condition
Benefits of AEC decrease pt dose, increase departmental efficiency, reduced film cost, reduced processing chemical cost, & prolonged tube life
Two types of AEC units ionization chamber & phototimer type.
The ionization chambers in an AED are located ___ the cassette. In front of
All of the following are advantages of AEC, except Eliminates need for proper positioning
Minimum response time refers to the time that must be set by the radiographer when making a radiographic exposure false
The purpose of the backup timer in an AED is to Protect the pt and Protect the x-ray tube
With AEC, each incremental density setting corresponds to a ___ change in density 25%
With which of the AEC units listed below does backscatter have the greatest impact on image quality? Phototimer type
The two most important factors affecting film density when using AEC are positioning and detector selection
All of the following can cause overexposure when using AEC except SID
It is acceptable tp use the center detector when performing abdominal radigraphy False
The outer detectors can be used with large field sizes True
OID affects density when uing AEC False
Increasing kV and mA can shorten the minimum response time False
Beam intensity affects exposure time when using AEC True
Activation of the backup timer is most often caused by Radiographic Error
Backup timers should never allow the pt to be exposed to more than ___ mAs 600
If the xray tube is not properly aligned to the Bucky grid, the exposure time will be Excessive long
The exposure time can be intentionally increased when using AEC by Decreasing mA
When using AEC, if a fast-speed sreen cassette were used instead of a medium-speed screen cassette, the exposure time would be unaffected
All of the following can affect AEC exposure time, except Film speed
Insufficient collimation __ exposure time when using AEC Reduces
The ionization chambers are situated between grid of the bucky device and the cassette. (Usually 3 chambers)
Two most important factors that affect image quality to consider are pt positioning and detector selection.
Created by: Darla1083
 

 



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