Aec Test Review

Front 1

AEC produces inconsistent levels of exposure when used properly. True or false?

Back 1

False

Front 2

Another name for AEC?

Back 2

Photo timer

Front 3

What signal does the AEC control?

A. Quality

B. Intensity

C. Calibration

D. kVp

Back 3

Intensity

Front 4

True or false? The AEC terminates exposure based on the calibrated amount of radiation that has reached the IR.

Back 4

True

Front 5

AEC determines what specific exposure factor?

Back 5

Time

Front 6

What are 2 types of AEC systems?

Back 6

Photo timer and ionization chambers

Front 7

What is the difference between the photo timer and the ionization chambers?

Back 7

How radiation is converted into electricity

Front 8

What is converted into electricity when using a photo timer?

Back 8

Light

Front 9

An electronic device that converts visible light into electrical energy?

Back 9

Photomultiplier tube

Front 10

What measures the radiation exposure to signal the timer to go off using photo timer?

Back 10

Light paddles and photomultiplier tube

Front 11

Which type of AEC device is more reliable?

Back 11

Ionization chambers

Front 12

Which type of AEC device is more accurate?

Back 12

Photo timer

Front 13

Photo timer detectors are positioned Blank to the IR and considered an Blank type.

Back 13

Positioned behind

Considered an exiting

Front 14

Ionization chambers are positioned blank to the IR and considered an blank type.

Back 14

Positioned in front

Considered an entrance

Front 15

Photo timer measures radiation before it hits the IR. True or false?

Back 15

False.

Front 16

A device that uses an ionization chamber to detect the quality of radiation exposing the patient and IR?

Back 16

Automatic exposure control

Front 17

Another name for an AEC that uses photomultiplier tubes and are not common today?

Back 17

Photo timer

Front 18

A hollow cell that contains air and is connected to the timer?

Back 18

Ionization chamber

Front 19

The shortest exposure time that the AEC system can produce?

Back 19

Minimum response time

Front 20

The maximum length of time the x-ray exposure will continue when using an AEC?

Back 20

Back up timer

Front 21

Part of the automatic exposure control device that allows the radiographer to adjust the amount of present radiation detection values?

Back 21

Density controls

Front 22

Advantages of AEC? (3)

Back 22

Lower repeats

Decrease patient exposure

Increase efficiency

Front 23

What is the best AEC set up?

A. Highest mA, lowest time

B. Lower mA, highest time

C. Highest mA, highest time

D. Lowest mA, lowest time

Back 23

A. Highest mA, lowest time

Front 24

What should be set to 150% to 200% of the expected exposure time?

Back 24

Back up timer

Front 25

What is the most common failure in the back up timer?

Back 25

Operator error

Front 26

What increases resistance making it harder for the capacitor to charge, allowing more radiation to exit the tube to make an image?

Back 26

Increases density controls

Front 27

What eliminates the need for the radiographer to set an exposure time?

Back 27

AEC

Front 28

What controls do the radiographer control using AEC? (2)

Back 28

mA

kVp

Front 29

True or false? AEC devices provide diagnostic quality exposures whether the strucures are positioned directly above the ionization chambers or not?

Back 29

False

Front 30

True or false? Ionization chambers are centered with one in the center, and the right and left chambers slightly higher?

Back 30

True

Front 31

When using more than one chamber, how is the quality of radiation calculated?

Back 31

Averaging the chambers being used

Front 32

What can fluid in the lugs do when using the AEC?

Back 32

Can cause an increase to the exposure of the patient

Front 33

Is water additive or destructive

Back 33

additive

Front 34

What can happen to AEC during a chest x-ray with a patient with exmphysema?

Back 34

Can cause a decrease exposure to patient

Front 35

What is emphysema

Back 35

Air

Front 36

What should you do if you need a longer AEC time and still want to maintain the same mAs?

Back 36

Decrease mA

Front 37

What device establishes maximum exposure time to prevent overexposure to the patient

Back 37

Back up timer

Front 38

When does the U.S. public law require AECs to terminate when operating about 50 kVp?

Back 38

600 maximum mAs

Front 39

What can happen if the backup timer is set too low?

Back 39

Under exposure

Front 40

AEC is used to consistently reproduce images of uniform denisty. True or false?

Back 40

True, as long as it is used properly

Front 41

What 3 factors can influence AEC accuracy

Back 41

Positioning

Chamber selection

Density setting

Front 42

What happens to an AEC exposure when patient is not positioned properly

Back 42

Suboptimal exposure

Front 43

How do you determine chamber selection?

Back 43

Anatomical location of the part of interest

Front 44

True or false? You should choose to increase density controls every time a patient is thicker?

Back 44

False

Front 45

AEC compensates for part thickness to a certain extent? True or false?

Back 45

True

Front 46

True or false? The AEC will compensate for all pathological conditions?

Back 46

False

Front 47

If the image is not properly collimated, this may cuase the exposure to terminate prematurely resulting in underexposure? True or false?

Back 47

True

Front 48

What happens to the image if a faster screen speed is used than what is calibrated?

Back 48

Over exposure

Front 49

what happens to the image if a slower screen speed is used?

Back 49

under exposure

Front 50

Under collimating causes over exposure to the patient. T or F?

Back 50

False. If you don't collimate enough, the AEC will shut off before it needs to.

Front 51

The radiographer controls mAs when using AEC. T or F?

Back 51

False

Front 52

What is not controlled by the AEC?

Back 52

kVP

(kVP has an effect on AEC, but AEC has no effect on kVP.)

Front 53

How can you help eliminate motion on your image when using the AEC while maintaining quanitity?

Back 53

Higher mA

(lower your time, increase mA)

Front 54

HOw can you attempt a breathing technique when using AEC?

Back 54

Lower mA

Front 55

When using the AEC with multiple chambers selected, which detector will have the most influence on exposure?

Back 55

The chamber receiving the most radiation and greater electrical signal

Front 56

If barium is over one cell and normal tissue over the other 2 cells

Back 56

The image will be overexposed

Front 57

YOu can't change present chambers using AEC. T or F?

Back 57

False

Front 58

what is normal density set at

Back 58

0

Front 59

T or F. Don't use density controls to compensate for kVP changes.

Back 59

True (Density controls increase patient dose)

Front 60

Proper positioning can

Back 60

Reduce repeats

Front 61

What causes the AEC to terminate the exposure while some areas of the image are still underexposed?

Back 61

Scatter (It detects scatter as unwanted x-ray and will shut up before it needs to)

Front 62

Minimum response time is?

Back 62

.001 seconds (Decrease mA for more time)

Front 63

If the minimum response time isn't met, how do you compensate?

Back 63

Decrease Ma

Front 64

What is APR

Back 64

Anatomically programmed radiography

Front 65

When should the radiographer override the APR (2)

Back 65

Patient considerations

Pathology

Front 66

Manual technique will (2)

Back 66

Make more precise repeats

Make it easier to get optimal imaging with incorrect positioning

Front 67

If tissue isn't covering AEC chamber completely what should radiographer do

Back 67

Unselect uncovered chamber

Front 68

If no chamber is covered by normal tissue for the area of interest (2)

Back 68

Get creative

Use a manual technique

Front 69

AEC has no impact on

Back 69

Contrast and resolution

Front 70

AEC has an impact on

Back 70

Quantity

Front 71

AEC impacts the number of photons that produce an image. T or F.

Back 71

True

Front 72

AEC impacts the density or blackness of an image. T or F?

Back 72

True

Front 73

For a pediatric exam with AEC

Back 73

mA should be increased

Front 74

FOr additive conditions, the AEC will used

Back 74

more time

Front 75

Selecting the wrong chamber causes the AEC to be used incorrectly, T or F

Back 75

True

Front 76

Thicker patients use

Back 76

increase in mAs

Front 77

What averages the signals between selected chambers?

Back 77

Operational amplifier

Front 78

which chamber gets the most exposure due to different attenuating qualities of tissue?

Back 78

left and right

Front 79

what determines the sensitivity of the chamber

Back 79

Calibrated optimal density

Front 80

What temporarily changes the sensitivity of the chambers

Back 80

Density controls

Front 81

Each increment in the density control increases/decreases exposure by;

Back 81

25%

Front 82

Osteoporosis will cause mA to be

Back 82

decreased

Front 83

Collimating a portion of the chamber off will cause

Back 83

Over exposure

Front 84

Why is the backup time important

Back 84

Radiation protection safety

Front 85

If KVP increases, how does it affect AEC

Back 85

Decreases time, density stays the same but contrast changes

Front 86

If patient is not positioned properly what can u do for a good image

Back 86

Use manual technique

Front 87

If time is selected by tech than they used

Back 87

a manual technique

Front 88

AEC for soft tissue, what should be done to increase contrast

Back 88

Decrease kVP (Contrast scale: low, long, lots)

Front 89

You should change technique when imagining through fiberglass cast? T or F

Back 89

F. only for plaster

Front 90

Calibration equals

Back 90

consistency

Front 91

The AEC is typically not used to image extremities

Back 91

True

Front 92

The AEC controls radiation exposure to the patient

Back 92

True

Front 93

What kind of grid is used inside the bucky during AEC?

Back 93

Reciprocating