AEC TEST

Question 1

The primary purpose of AEC is to:

Answer 1

control the amount of radiation reaching the IR

Question 2

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

Answer 2

time of exposure

Question 3

When using AEC , the radiographer is responsible for determining:

Answer 3

kVp

Question 4

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

Answer 4

the people who service the equipment

Question 5

The two types of detectors used in AEC are:

Answer 5

phototimers and ionization chambers

Question 6

The original type of AEC detector was the:

Answer 6

phototimer

Question 7

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

Answer 7

ionization chamber

Question 8

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

Answer 8

3

Question 9

An ionization chamber is a hollow device that contains:

Answer 9

air

Question 10

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

Answer 10

the exposure will stop

Question 11

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

Answer 11

minimum response time

Question 12

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

Answer 12

back-up time

Question 13

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

Answer 13

mAs readout

Question 14

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

Answer 14

density controls

Question 15

When using AEC, the kVp:

Answer 15

is set as appropriate for the study

Question 16

Using a higher kVp during an AEC examination results in:

Answer 16

a shorter exposure time

Question 17

The AEC minimum response time may post a problem when:

Answer 17

the patient is unable to hold still for the exposure

Question 18

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

Answer 18

600

Question 19

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

Answer 19

150%

Question 20

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

Answer 20

the image receptor will be underexposed

Question 21

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

Answer 21

the ones that are superimposed by the anatomic structure of interest

Question 22

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

Answer 22

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

Question 23

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

Answer 23

the film image will be too light

Question 24

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

Answer 24

the exposure will terminate very quickly

Question 25

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

Answer 25

appropriate exposure to the IR

Question 26

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?

Answer 26

dark

Question 27

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

Answer 27

shorter than needed

Question 28

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

Answer 28

preset settings based on the part being imaged

Question 29

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)

Answer 29

light; underexposed

Question 30

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)

Answer 30

the same; lower

Question 31

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)

Answer 31

darker; longer

Question 32

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)

Answer 32

light; short

Question 33

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)

Answer 33

appropriate; long

Question 34

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)

Answer 34

unchanged; longer

Question 35

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)

Answer 35

unchanged; lower

Question 36

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)

Answer 36

appropriate; increased

Question 37

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)

Answer 37

appropriate; quantum noise

Question 38

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

Answer 38

True

Question 39

Phototimer AEC devices convert the radiation to light energy.

Answer 39

True

Question 40

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

Answer 40

True

Question 41

The mAs readout is of little value to the radiographer.

Answer 41

False

Question 42

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

Answer 42

False

Question 43

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

Answer 43

False

Question 44

All APR settings use the AEC.

Answer 44

False

Question 45

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

Answer 45

False