Question 1

Where is the sensor located in an automatic exposure device with a gas-filled chamber?

Accepted Answer

A)  In front of the patient 
B)  Behind the Bucky tray 
C)  In front of the image receptor 
D)  on the table-top 
A)  In front of the patient 
B)  Behind the Bucky tray 
C)  In front of the image receptor 
D)  on the table-top C

Question 2

Where is the sensor located in an automatic exposure device that converts light into an electrical signal?

Accepted Answer

A)  In front of the patient 
B)  Behind the image receptor 
C)  In front of the image receptor 
D)  On the table-top 
A)  In front of the patient 
B)  Behind the image receptor 
C)  In front of the image receptor 
D)  On the table-top B

Question 3

AEC eliminates the need for the radiographer to select the actual _____ the examination will require.

Accepted Answer

A)  kVp 
B)  SID 
C)  time 
D)  focal spot size 
A)  kVp 
B)  SID 
C)  time 
D)  focal spot size C

Question 4

Why was automatic exposure control (AEC) originally developed?

Accepted Answer

A)  To decrease the need for technique charts 
B)  To make the technologist more of a "button pusher" 
C)  To reduce repeats and improve image quality 
D)  To increase productivity and patient dose 
A)  To decrease the need for technique charts 
B)  To make the technologist more of a "button pusher" 
C)  To reduce repeats and improve image quality 
D)  To increase productivity and patient dose

Question 5

If the detector is directly exposed to the primary beam during a film-screen study, the area of interest will appear:

Accepted Answer

A)  overexposed. 
B)  underexposed. 
C)  correctly exposed. 
D)  to have high contrast. 
A)  overexposed. 
B)  underexposed. 
C)  correctly exposed. 
D)  to have high contrast.

Question 6

AEC can typically be used with table-top exams.

Accepted Answer

A) True 
 B)False

Question 7

What describes the shortest exposure time required for the AEC device to operate?

Accepted Answer

A)  Backup time 
B)  Minimum response time 
C)  Master density time 
D)  a and c 
A)  Backup time 
B)  Minimum response time 
C)  Master density time 
D)  a and c

Question 8

When the radiographer is considering whether to repeat a film using AEC, it is important to determine the reason why the first radiograph failed.

Accepted Answer

A) True 
 B)False

Question 9

In order to become familiar with manual technical factors (i.e., setting mAs and kVp and not using AEC), it is very helpful to pay attention to the:

Accepted Answer

A)  exposure time. 
B)  heat units. 
C)  density control. 
D)  mAs readout. 
A)  exposure time. 
B)  heat units. 
C)  density control. 
D)  mAs readout.

Question 10

What is the purpose of setting a backup time/mAs?

Accepted Answer

A)  To prevent excessive exposure of the patient 
B)  To make certain the contrast is acceptable if the chosen kVp is too low 
C)  To make certain the density is acceptable if the patient moves 
D)  To prevent the selection of the wrong detector 
A)  To prevent excessive exposure of the patient 
B)  To make certain the contrast is acceptable if the chosen kVp is too low 
C)  To make certain the density is acceptable if the patient moves 
D)  To prevent the selection of the wrong detector

Question 11

The most common cause for repeating images done with film-screen and AEC is inaccurate:

Accepted Answer

A)  kVp selection. 
B)  back-up mAs selection. 
C)  centering. 
D)  alignment of the tube and image receptor. 
A)  kVp selection. 
B)  back-up mAs selection. 
C)  centering. 
D)  alignment of the tube and image receptor.

Question 12

When using AEC with film-screen, what should the radiographer adjust to manipulate the overall density of the image?

Accepted Answer

A)  kVp 
B)  Backup time 
C)  Focal spot size 
D)  Density control 
A)  kVp 
B)  Backup time 
C)  Focal spot size 
D)  Density control

Question 13

When using film-screen, what happens when an outside detector is selected for an AP thoracic spine?

Accepted Answer

A)  The spine will have insufficient contrast. 
B)  The spine will be too dark. 
C)  The spine will have excessive contrast. 
D)  The spine will have insufficient density. 
A)  The spine will have insufficient contrast. 
B)  The spine will be too dark. 
C)  The spine will have excessive contrast. 
D)  The spine will have insufficient density.

Question 14

When using AEC, what should the radiographer adjust to manipulate the contrast of the image?

Accepted Answer

A)  kVp 
B)  Detector location 
C)  Time 
D)  Focal spot size 
A)  kVp 
B)  Detector location 
C)  Time 
D)  Focal spot size

Question 15

Which automatic exposure device works by converting x-ray photons first into light and then into an electronic signal?

Accepted Answer

A)  Phototimer 
B)  Gas detector 
C)  Ionization chamber 
D)  Back-up timer 
A)  Phototimer 
B)  Gas detector 
C)  Ionization chamber 
D)  Back-up timer

Question 16

A good reason to use density control is to make the film darker to compensate for improper centering.

Accepted Answer

A) True 
 B)False

Question 17

When doing a CR study using AEC, what will happen to the patient exposure when changing from the -1 to +1 density setting?

Accepted Answer

A)  Patient exposure will increase. 
B)  Patient exposure will decrease. 
C)  Patient exposure will not change. 
A)  Patient exposure will increase. 
B)  Patient exposure will decrease. 
C)  Patient exposure will not change.

Question 18

What would happen if a film-screen radiographic exam required an exposure time faster than the minimum response time of the AEC sensors?

Accepted Answer

A)  Image density would be optimal. 
B)  Image density would be excessive. 
C)  Response time has nothing to do with AEC. 
D)  Image contrast would be high. 
A)  Image density would be optimal. 
B)  Image density would be excessive. 
C)  Response time has nothing to do with AEC. 
D)  Image contrast would be high.

Question 19

What does APR stand for?

Accepted Answer

A)  All programming radiology 
B)  Anatomically programmed radiography 
C)  Accurately positioned radiographs 
D)  None of the above 
A)  All programming radiology 
B)  Anatomically programmed radiography 
C)  Accurately positioned radiographs 
D)  None of the above

Question 20

What is the appropriate setting for backup time/mAs?

Accepted Answer

A)  50% of the expected mAs 
B)  100% of the expected mAs 
C)  150% of the expected mAs 
D)  400% of the expected mAs 
A)  50% of the expected mAs 
B)  100% of the expected mAs 
C)  150% of the expected mAs 
D)  400% of the expected mAs

Where is the sensor located in an automatic exposure device with a gas-filled chamber?

Where is the sensor located in an automatic exposure device that converts light into an electrical signal?

AEC eliminates the need for the radiographer to select the actual _____ the examination will require.

Why was automatic exposure control (AEC) originally developed?

If the detector is directly exposed to the primary beam during a film-screen study, the area of interest will appear:

AEC can typically be used with table-top exams.

What describes the shortest exposure time required for the AEC device to operate?

When the radiographer is considering whether to repeat a film using AEC, it is important to determine the reason why the first radiograph failed.

In order to become familiar with manual technical factors (i.e., setting mAs and kVp and not using AEC), it is very helpful to pay attention to the:

What is the purpose of setting a backup time/mAs?

The most common cause for repeating images done with film-screen and AEC is inaccurate:

When using AEC with film-screen, what should the radiographer adjust to manipulate the overall density of the image?

When using film-screen, what happens when an outside detector is selected for an AP thoracic spine?

When using AEC, what should the radiographer adjust to manipulate the contrast of the image?

Which automatic exposure device works by converting x-ray photons first into light and then into an electronic signal?

A good reason to use density control is to make the film darker to compensate for improper centering.

When doing a CR study using AEC, what will happen to the patient exposure when changing from the -1 to +1 density setting?

What would happen if a film-screen radiographic exam required an exposure time faster than the minimum response time of the AEC sensors?

What does APR stand for?

What is the appropriate setting for backup time/mAs?

Radiation and Its Discovery

The X-Ray Beam

Radiographic Image Formation

Radiographic Image Quality: Photographic Properties

Radiographic Image Quality: Geometric Properties

Scatter Control

Image Receptors

Radiographic Film Processing

Sensitometry

Exposure Factor Selection

Digital Imaging

Filters

Exam 11: Automatic Exposure Control

Where is the sensor located in an automatic exposure device with a gas-filled chamber?

Where is the sensor located in an automatic exposure device that converts light into an electrical signal?

AEC eliminates the need for the radiographer to select the actual _____ the examination will require.

Why was automatic exposure control (AEC) originally developed?

If the detector is directly exposed to the primary beam during a film-screen study, the area of interest will appear:

AEC can typically be used with table-top exams.

What describes the shortest exposure time required for the AEC device to operate?

When the radiographer is considering whether to repeat a film using AEC, it is important to determine the reason why the first radiograph failed.

In order to become familiar with manual technical factors (i.e., setting mAs and kVp and not using AEC), it is very helpful to pay attention to the:

What is the purpose of setting a backup time/mAs?

The most common cause for repeating images done with film-screen and AEC is inaccurate:

When using AEC with film-screen, what should the radiographer adjust to manipulate the overall density of the image?

When using film-screen, what happens when an outside detector is selected for an AP thoracic spine?

When using AEC, what should the radiographer adjust to manipulate the contrast of the image?

Which automatic exposure device works by converting x-ray photons first into light and then into an electronic signal?

A good reason to use density control is to make the film darker to compensate for improper centering.

When doing a CR study using AEC, what will happen to the patient exposure when changing from the -1 to +1 density setting?

What would happen if a film-screen radiographic exam required an exposure time faster than the minimum response time of the AEC sensors?

What does APR stand for?

What is the appropriate setting for backup time/mAs?

Radiation and Its Discovery

The X-Ray Beam

Radiographic Image Formation

Radiographic Image Quality: Photographic Properties

Radiographic Image Quality: Geometric Properties

Scatter Control

Image Receptors

Radiographic Film Processing

Sensitometry

Exposure Factor Selection

Digital Imaging

Filters