AEC TEST Flashcards
The primary purpose of AEC is to:
control the amount of radiation reaching the IR
AEC controls the amount of radiation reaching the IR by controlling the:
time of exposure
When using AEC , the radiographer is responsible for determining:
kVp
The predetermined level of radiation exposure needed to terminate the exposure when using AEC is set by:
the people who service the equipment
The two types of detectors used in AEC are:
phototimers and ionization chambers
The original type of AEC detector was the:
phototimer
Today’s AEC system is most likely to use a/an:
ionization chamber
There is typically a configuration of at least ___ AEC detectors in place.
3
An ionization chamber is a hollow device that contains:
air
Once the electric charge from an AEC detector reaches a preset level:
the exposure will stop
The shortest exposure time that a radiographic tube with AEC can have is the:
minimum response time
The maximum length of time that an exposure lasts when using AEC is the:
back-up time
The actual amount of exposure used for an image when AEC is being used is the:
mAs readout
These can be adjusted to increase or decrease the amount of radiation needed to terminate the exposure using AEC.
density controls
When using AEC, the kVp:
is set as appropriate for the study
Using a higher kVp during an AEC examination results in:
a shorter exposure time
The AEC minimum response time may post a problem when:
the patient is unable to hold still for the exposure
If the back-up time is set by the equipment, the exposure time should end when the mAs reaches:
600
When the radiographer has the opportunity to set the back-up time, it should be approximately _____ of the expected exposure time.
150%
If the back-up time is shorter than the actual exposure needed for a properly exposed image:
the image receptor will be underexposed
The detector(s) selected for an image should be:
the ones that are superimposed by the anatomic structure of interest
Which of the following is the most critical aspect of successfully performing an examination using AEC?
centering the anatomy of interest over the selected detector(s)
If the patient for an AP thoracic spine is centered so that the spine is not over the top of the detector:
the film image will be too light
If the AEC detectors are not completely covered by the part being imaged and are exposed to primary radiation:
the exposure will terminate very quickly
When your patient for an AP abdomen is very large, using AEC will result in:
appropriate exposure to the IR
When a patient for a unilateral AP hip image has a metal prosthesis covering the detector, how will the bony anatomy appear with film imaging?
dark
When there is a significant amount of scatter radiation reaching the detector, the exposure time will be:
shorter than needed
Automatically programmed radiography (APR) is a system in which the radiographer selects:
preset settings based on the part being imaged
With film-screen imaging using AEC, if an AP thoracic spine is imaged using an outside instead of center detector, the density in the area of interest will be _____ and the patient will be _____. (Assuming all other factors are appropriate)
light; underexposed
With film-screen imaging using AEC, if an AP thoracic spine is imaged using 110 kVp instead of the appropriate 80 kVp, the density in the area of interest will be _____ and the image contrast will be _____. (Assuming all other factors are appropriate)
the same; lower
With film-screen imaging using AEC, if an AP thoracic spine is imaged with the density setting changed form 0 to +2, the density in the area of interest will be _____ and the exposure time will be _____. (Assuming all other factors are appropriate)
darker; longer
With film-screen imaging using AEC, if an AP thoracic spine is imaged with the central ray passing 3 inches to the right of the spine, the density in the area of interest will be _____ and the exposure time will be ____. (Assuming all other factors are appropriate)
light; short
With digital imaging using AEC, if an AP thoracic spine is imaged with the central ray passing 3 inches to the right of the spine, the brightness in the area of interest is ____ and the exposure time is ____. (Assuming all other factors are appropriate)
appropriate; long
With digital imaging using AEC, if an AP thoracic spine is imaged with the density setting changed from 0 to +2, the brightness in the area of interest will is ____ and the exposure time is ____. (Assuming all other factors are appropriate)
unchanged; longer
With digital imaging using AEC, if an AP thoracic spine is imaged using 110 kVp instead of the appropriate 80 kVp, the brightness in the area of interest is _____ and the patient exposure is _____. (Assuming all other factors are appropriate)
unchanged; lower
With digital imaging using AEC, if an AP thoracic spine is imaged using an outside instead of center detector, the brightness in the area of interest will be ______ and the quantum noise will be ____. (Assuming all other factors are appropriate)
appropriate; increased
With digital imaging using AEC, if an AP thoracic spine is imaged with the density setting changed form 0 to -2, the brightness in the area of interest is ____ and the ____ is increased. (Assuming all other factors are appropriate)
appropriate; quantum noise
When using AEC, the exit radiation is converted into an electrical signal.
True
Phototimer AEC devices convert the radiation to light energy.
True
The amount of electric charge produced in an AEC detector depends on the amount of radiation absorbed by the detector.
True
The mAs readout is of little value to the radiographer.
False
If an AEC has three detectors, only one of the three can be selected for an exposure.
False
It is safe to assume that APR setting have been developed to produce the best quality images with the least amount of exposure.
False
All APR settings use the AEC.
False
Once a part has been selected using APR, the exposure factors can NOT be adjusted.
False
