
Ch 13 Exposure Technique Selection
Authored by Christina Thomas
Science
University
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38 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Primary Function of the AEC is to
reduce patient dose
control the amount of radiation reaching the IR
help the technologist not to think too much
all of the above
Answer explanation
AEC detectors DETECT radiation exposure . Once a preset radiation value is detected, it terminates the exposure. (controlling the seconds of exposure)
This is how it controls the amount of radiation reaching the IR, by not allowing too much radiation and not too little radiation.
Pt dose is affected by mAs
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
The first generation of AEC were known as
IDK
Photomultiplier Tube
Phototimers
Ionization Chamber
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
AEC controls radiation exposure reaching the IR by
controlling exposure time
controlling KVP and MAS
controlling the mA
all of the above
Answer explanation
mAs = milliamperage x seconds.
only the seconds are controlled by the AEC.
ma is controlled by the tech
AEC adjusts the seconds, which will affect the overall mAs
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Ionization Chamber AEC are known as ___type devices
Corridor
In between
Entrance Type
Exit Type
Answer explanation
Ionization Chamber AEC are located before the Image Receptor, so the radiation ENTERS the AEC and then ENTERS the IR.
Phototimer AEC are EXIT type. Radiation EXITS the IR and then EXITS the AEC
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Once X-rays reach the AEC device
they are converted into an ____
Electric Charge/Signal
Analog Signal
Digital Signal
Digital Image
Answer explanation
Xrays are ionizing radiation
Radiation interacts with the air in the ionization chamber
This creates electric charges /electric signal which travels to the meter
once the preset radiation level is reached, exposure is terminated
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
High KVP = ____contrast
low
high
medium
higher
Answer explanation
The higher the kVp, the more likely the x-ray beam will be able to penetrate through thicker or more dense material. tissues will not absorb as much of the xray beam
Low kVp photons are weak and easily absorbed by body tissues ...creating a higher contrast between adjacent tissues
7.
FILL IN THE BLANK QUESTION
1 min • 5 pts
High KVP ____ exposure time when using an AEC
Answer explanation
High KVP= more power/voltage in our xray beam. More xrays will reach the IR
If AEC detects more xrays, it will reach the preset radiation level faster, and terminate the exposure
High kvp = shorter exposure time (with AEC)
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