Deck 33: Automatic Exposure Controls

Question 1

When an AEC is used for an AP hip, which ionization chambers are utilized?

A)the center cell
B)the left and right outer cells
C)all three cells
D)the left outer cell only

Answer 1

the center cell

Question 2

Most AEC consoles permit activation of

A)all three cells simultaneously.
B)all three cells in any combination.
C)the outer cells when the center cell is inactivated.
D)the center cell and either outer cell.

Answer 2

all three cells in any combination.

Question 3

When an AEC is used for an AP abdomen, which ionization chambers are utilized?

A)the center cell
B)the left and right outer cells
C)all three cells
D)the left outer cell only

Answer 3

all three cells

Question 4

Contemporary AEC systems work on the x-ray property

A)causing certain crystals to fluoresce.
B)causing ionization of gases.
C)of producing small amounts of heat as they pass through matter.
D)affecting photographic film.

Question 5

Early versions of AEC technology were referred to as

A)photometers.
B)phototimers.
C)photosensors.
D)voltage regulators.

Question 6

The backup time of most AECs is set at ____ of the anticipated manual exposure time.

A)10%
B)50%
C)100%
D)150%

Question 7

When more than one ionization chamber is used, the signal is

A)averaged.
B)muted.
C)multiplied.
D)all of the above

Question 8

A radiographer is performing an AP knee radiograph using AEC.The manual technique for this exam would be 12 mAs at 80 kVp.The backup mAs the radiographer should set would be

A)6 mAs.
B)12 mAs.
C)18 mAs.
D)24 mAs.

Question 9

When an AEC is used for a PA chest, which ionization chambers are utilized?

A)the center cell
B)the left and right outer cells
C)all three cells
D)the right outer cell only

Question 10

The single function of an AEC is to eliminate the need to set

A)kVp.
B)mA.
C)time.
D)all of the above

Question 11

When an AEC is used for an AP lumbar spine, which ionization chambers are utilized?

A)the center cell
B)the left and right outer cells
C)all three cells
D)the right outer cell only

Question 12

When using an AEC, the radiographer loses control of

A)distance.
B)mA.
C)kVp.
D)mAs.

Question 13

As you are performing a KUB radiograph on a patient using AEC, you notice that your post-exposure readout is unusually high.A possible explanation for this high reading could be

A)the kVp was too high.
B)the backup mAs was set too low.
C)a detector was collimated out of the field of exposure.
D)the minimum response time was too long.

Question 14

In the event that the mAs needed for a small anatomical structure is very small, in order to ensure the AEC terminates the exposure correctly,

A)the kVp should be increased.
B)the mA should be decreased.
C)all three detectors should activated.
D)the large focal spot should be used.

Question 15

U.S.public law requires that generators automatically terminate AEC exposures at ____ mAs above 50 kVp.

A)100
B)300
C)600
D)900

Question 16

Ionization chamber AECs are usually used in a ____ chamber configuration.

A)one-
B)two-
C)three-
D)four-

Question 17

Automatic exposure devices provide a diagnostic quality radiograph when the

A)anatomy of interest is positioned directly above the appropriate ionization chambers.
B)proper time is set.
C)correct focal spot is selected.
D)beam filtration is minimum.

Question 18

The most common configuration includes

A)three chambers.
B)a center chamber at the center of the image receptor.
C)the left and right chambers slightly higher and lateral.
D)all of the above

Question 19

If the primary beam is collimated from an activated chamber, the result is a

A)light radiograph.
B)dark radiograph.
C)short exposure time.
D)decrease in radiographic density.

Question 20

When an AEC is used for a lateral chest, which ionization chambers are utilized?

A)the center cell
B)the left and right outer cells
C)all three cells
D)the left outer cell only

Question 21

Match the following choices with the correct statement as each is related to automatic exposure control technology.
-1, -2, 0, +1, +2

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only

Question 22

When performing a follow-up abdomen image on a patient who recently had a small bowel study, it may be best to

A)deactivate the AEC and set the technique manually.
B)dramatically increase the backup mAs.
C)increase the minimum response time.
D)increase to 120 kVp.

Question 23

When using APR for a radiographic exposure,

A)AEC may be turned off manually.
B)a backup mAs is already set.
C)programmed AEC chamber selections may be reconfigured.
D)all of the above

Question 24

Match the following choices with the correct statement as each is related to automatic exposure control technology.
AP hip

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only

Question 25

Match the following choices with the correct statement as each is related to automatic exposure control technology.
typically 0.001 sec

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only

Question 26

Match the following choices with the correct statement as each is related to automatic exposure control technology.
Older technologists may still refer to it.

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only

Question 27

Match the following choices with the correct statement as each is related to automatic exposure control technology.
AP abdomen radiograph

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only

Question 28

AEC density controls are properly used to

A)compensate for patient thickness.
B)balance the AEC detectors.
C)compensate for asymmetrical pathology.
D)compensate for improper positioning.

Question 29

Most modern AEC systems provide a minimum response time of

A)1 millisecond.
B).001 sec.
C)1/1000 sec.
D)all of the above

Question 30

A new high frequency radiographic system is being released to a customer for first clinical use.The applications person states that the AEC density controls are in 20% increments.If a normal AEC exposure of the hip is 24 mAs, a repeat exposure at +2 would yield a mAs value of

A)26 mAs.
B)29 mAs.
C)34 mAs.
D)48 mAs.

Question 31

Match the following choices with the correct statement as each is related to automatic exposure control technology.
+2 used when N would have been optimum

A)phototiming
B)minimum response time
C)backup mAs
D)underexposed image
E)overexposed image
F)density controls
G)all three detectors
H)center detector only