WorksheetsRAD 4100 Equipment & Maintenance II Worksheet #1
Total questions: 25
Worksheet time: 13mins
Why was the automatic exposure control (AEC) originally developed?
To detect the needed for a technique chart
To reduce producing retakes
To increase productivity and patient throughput
To reduce scatter radiation
Which of the following terms does not belong in the list?
Phototimer
Ionization chamber
Bucky proliferator
Photomultiplier
Which automatic exposure device works by using a gas-filled chamber?
Phototimer
Ionization chamber
Diode sensor
Photomultiplier
Where is the sensor located in an automatic exposure device with a gas-filled chamber?
Behind the patient
In front of the patient
Behind the film
In front of the film
Which automatic exposure device works by converting x-ray photons first into light and then into an electronic signal?
Diode sensor
Ionization chamber
Photomultiplier
Bucky proliferator
Where is the sensor located in an automatic exposure device that converts light into an electrical signal?
In front of the patient
In front of the film
In front of the image receptor
What variable is controlled by the automatic exposure control device?
kVp
Focal spot size
Exposure time
What would happen if a film-screen radiograph exam required an exposure time less than the minimum response time of the AEC sensor?
Image density would be optimal.
Image density would be excessive.
A good example of when the radiographer is not sure where the structure to be imaged is located is when the radiographer uses AEC.
True
False
When the radiographer is considering whether to repeat a film using AEC, it is not important to determine the reason why the first radiograph failed.
True
False
A good reason to use density control is to make the film darker to compensate for poor positioning.
True
False
The image receptor can sense image receptor speeds with AEC because the director can sense image receptor speed.
True
False
What phrase describes the shortest exposure time required for the AEC device to operate?
Response time
Master density
Backup time
AEC calibration
kVp
Master density affects the need for the radiographer to select the actual ________ the AEC combination will require.
kVp
mAs
Time
Focal spot size
Density controls
When using AEC, what should the radiographer adjust to manipulate the contrast of the image?
Time
mAs
kVp
Focal spot size
Density controls
When using AEC, what should the radiographer adjust to manipulate the overall density of the image?
Time
mAs
kVp
Focal spot size
Density controls
What is the appropriate setting for backup time?
50% of the expected mAs
100% of the expected mAs
400% of the expected mAs
500% of the expected mAs
To make certain the density is acceptable if the chosen kVp is too low
What is the primary purpose of backup time?
To make certain the density is acceptable if the patient moves
To make certain the density is acceptable if the chosen kVp is too low
To prevent excessive exposure of the patient
When improper use of the wrong detector occurs, what happens?
The image will be too excessive contrast.
The image will be insufficient density.
The image will most likely be unrecognizable.
The image will be too light.
What does APR stand for?
Anatomically Programmed Radiography
Anatomically Programmed Recording
None of the above
All of the above
A screen study using AEC should always be used with table-top exams.
True
False
When doing a film/screen study using AEC, what will happen to the density in the area of interest when changing from 70 kVp to 100 kVp?
density decreases
density increases
density remains unchanged
density quadruples
When doing a film/screen study using AEC, what will happen to the density in the area of interest when changing from -1 to +1 density setting?
density decreases
density increases
density remains unchanged
density quadruples
When doing a CR study using AEC, what will happen to the density in the area of interest when changing from -1 to +1 density setting?
density decreases
density increases
density remains unchanged
density quadruples
When doing a CR study using AEC, what will happen to patient exposure when changing to a higher density setting?
Patient exposure increases
Patient exposure decreases
Patient exposure remains unchanged
Patient exposure quadruples
