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Radiology > AEC TEST > Flashcards

AEC TEST Flashcards

1
Q

The primary purpose of AEC is to:

A

control the amount of radiation reaching the IR

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2
Q

AEC controls the amount of radiation reaching the IR by controlling the:

A

time of exposure

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3
Q

When using AEC , the radiographer is responsible for determining:

A

kVp

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4
Q

The predetermined level of radiation exposure needed to terminate the exposure when using AEC is set by:

A

the people who service the equipment

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5
Q

The two types of detectors used in AEC are:

A

phototimers and ionization chambers

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6
Q

The original type of AEC detector was the:

A

phototimer

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7
Q

Today’s AEC system is most likely to use a/an:

A

ionization chamber

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8
Q

There is typically a configuration of at least ___ AEC detectors in place.

A

3

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9
Q

An ionization chamber is a hollow device that contains:

A

air

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10
Q

Once the electric charge from an AEC detector reaches a preset level:

A

the exposure will stop

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11
Q

The shortest exposure time that a radiographic tube with AEC can have is the:

A

minimum response time

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12
Q

The maximum length of time that an exposure lasts when using AEC is the:

A

back-up time

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13
Q

The actual amount of exposure used for an image when AEC is being used is the:

A

mAs readout

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14
Q

These can be adjusted to increase or decrease the amount of radiation needed to terminate the exposure using AEC.

A

density controls

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15
Q

When using AEC, the kVp:

A

is set as appropriate for the study

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16
Q

Using a higher kVp during an AEC examination results in:

A

a shorter exposure time

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17
Q

The AEC minimum response time may post a problem when:

A

the patient is unable to hold still for the exposure

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18
Q

If the back-up time is set by the equipment, the exposure time should end when the mAs reaches:

A

600

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19
Q

When the radiographer has the opportunity to set the back-up time, it should be approximately _____ of the expected exposure time.

A

150%

20
Q

If the back-up time is shorter than the actual exposure needed for a properly exposed image:

A

the image receptor will be underexposed

21
Q

The detector(s) selected for an image should be:

A

the ones that are superimposed by the anatomic structure of interest

22
Q

Which of the following is the most critical aspect of successfully performing an examination using AEC?

A

centering the anatomy of interest over the selected detector(s)

23
Q

If the patient for an AP thoracic spine is centered so that the spine is not over the top of the detector:

A

the film image will be too light

24
Q

If the AEC detectors are not completely covered by the part being imaged and are exposed to primary radiation:

A

the exposure will terminate very quickly

25
Q

When your patient for an AP abdomen is very large, using AEC will result in:

A

appropriate exposure to the IR

26
Q

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?

A

dark

27
Q

When there is a significant amount of scatter radiation reaching the detector, the exposure time will be:

A

shorter than needed

28
Q

Automatically programmed radiography (APR) is a system in which the radiographer selects:

A

preset settings based on the part being imaged

29
Q

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)

A

light; underexposed

30
Q

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)

A

the same; lower

31
Q

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)

A

darker; longer

32
Q

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)

A

light; short

33
Q

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)

A

appropriate; long

34
Q

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)

A

unchanged; longer

35
Q

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)

A

unchanged; lower

36
Q

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)

A

appropriate; increased

37
Q

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)

A

appropriate; quantum noise

38
Q

When using AEC, the exit radiation is converted into an electrical signal.

A

True

39
Q

Phototimer AEC devices convert the radiation to light energy.

A

True

40
Q

The amount of electric charge produced in an AEC detector depends on the amount of radiation absorbed by the detector.

A

True

41
Q

The mAs readout is of little value to the radiographer.

A

False

42
Q

If an AEC has three detectors, only one of the three can be selected for an exposure.

A

False

43
Q

It is safe to assume that APR setting have been developed to produce the best quality images with the least amount of exposure.

A

False

44
Q

All APR settings use the AEC.

A

False

45
Q

Once a part has been selected using APR, the exposure factors can NOT be adjusted.

A

False

Radiology (20 decks)

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