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AEC
More AEC
QA/QC
Exposure Systems
Exposure Conversion Problems
100
This should be set 1.5 times or 150% of the expected manual technique time.
What is AEC backup time
100
This measures the exposure to the receptor.
What is Ionization chambers
100
This program addresses the safe and reliable operation of equipment.
What is quality control
100
Using the maximum kVp as optimal (Fixed kV system) allows for a corresponding decrease in this
What is mAs
100
This formula is used so that the technologist knows what new mAs should be used when the SID has changed.
What is The Exposure Maintenance Formula (How is it expressed)
200
AEC eliminates the need for the radiographer to set this
What is exposure time (an ultimately mAs)
200
The number of ionization chambers used in AECs
What is Three (what's their configuration)
200
The star test pattern is used to measure
What is effective focal-spot size (list the other two)
200
This exposure system reduces x-ray tube wear and decreases patient dose
What is fixed kVp system
200
This is used to maintain the IR exposure when the only technical factor adjustment that can be made by the radiographer is increasing the kVp
What is The 15% Rule
300
This is the length of time necessary for the AEC to respond to the ionization and send a signal to terminate the exposure?
What is minimum response time
300
When more than one ionization chamber is used, the signal is
What is averaged
300
The exposure linearity test is used to measure the accuracy of adjacent _______
What is mA stations/settings
300
This exposure system increases scatter radiation and lengthens exposure latitude.
What is fixed kVp system
300
This is the grid conversion factor for an 8:1 grid
What is 4
400
Image appearance if collimation is kept wide-open.
What is underexposed.
400
Image appearance if expected density is lacking when using AEC.
What is underexposed (Give an example)
400
This test tool is used to measure poor film-to-screen contact.
What is wire mesh test tool
400
This exposure system permits finer adjustments of kVp than of time or mA settings.
What is Variable kV systems
400
An image is produced using the following factors: 80 kVp, 25 mAs, 40" SID, 8:1 grid. What will be the new mAs if you repeat the image using 80 kVp, 72" SID, 12:1 grid.
What is 101.25 mAs
500
Image appearance if the entire anatomical part doesn't cover the entire ionization chamber. (clavicle exam)
What is underexposed (open for discussion) ;)
500
AEC devices are equipped with these, which allow the radiographer to fine-tune the radiographic density.
What are density controls
500
Several different exposures are taken with the same technical factors to assess this
What is Generator Exposure Reproducibility (must be within +/- 5%)
500
Optimal kVp must ensure
What is acceptable contrast, sufficient penetration, availability of diagnostic information
500
You obtain a suboptimal image using: 92 kVp, 160 mAs, no grid, 200 RS, at 72" SID. You repeat the image in hopes of diagnostic quality using: 80 kVp, 16:1 grid, 400 RS, at 40" SID. What new mAs will be need to maintain the same image exposure?
What is 296 mAs