Ch. 13 Test

Question 1

____ uses a photomultiplier tube or a photodiode coupled with a fluorescent screen.

Answer 1

phototimer

Question 2

____ is a hollow air-filled cell connected to a timer circuit via wire.

Answer 2

ionization chamber

Question 3

T/F - Phototimers use DAP meters to determine when to terminate the exposure.

Answer 3

false

Question 4

____ are much less prone to failure, though they are not as accurate.

Answer 4

ionization chambers

Question 5

T/F - Phototimers are the most commonly used form of AEC today.

Answer 5

false

Question 6

Because AEC only controls the amount of radiation that reaches the IR, it has ____ on contrast.

Answer 6

no effect

Question 7

Raising kVp when using AEC ____ exposure time.

Answer 7

decreases

Question 8

Lowering kVp when using AEC ____ exposure time.

Answer 8

increases

Question 9

Increasing or decreasing ____ will also effect exposure time when using AEC.
- SID
- part thickness
- mA
- all of the above
- none of the above

Answer 9

all of the above

Question 10

T/F - AEC may not be appropriate for use with pediatric patients due to increased minimum response time.

Answer 10

true

Question 11

____ is the maximum amount of time that an exposure will go before it is terminated.

Answer 11

backup time

Question 12

In general, backup time should be set to terminate when the exposure has reached ____% of the desired exposure.

Answer 12

150-200

Question 13

T/F - When using AEC, the part being examined can be placed anywhere on the receptor and still achieve ideal results.

Answer 13

false

Question 14

T/F - Collimation has no effect on AEC.

Answer 14

false

Question 15

When performing QA measures on an AEC system, the system should be able to provide multiple exposures with mR readings with __% of each other.

Answer 15

5

Question 16

When performing QA measures on an AEC system, the system should be able to provide multiple exposures that result in images with pixel brightness levels that are __% from each other.

Answer 16

30

Question 17

T/F - Exposure technique charts that are based around variable kVp are the best because they do not alter contrast.

Answer 17

false

Question 18

T/F - Exposure technique charts that are based around fixed mAs are the best because they do not alter contrast.

Answer 18

false

Question 19

T/F - The most ideal exposure technique charts are based around fixed kVp/variable mAs because they do not involve changing contrast in order to properly radiate the part being imaged.

Answer 19

true

Question 20

When using a fixed kVp/variable mAs exposure technique chart, mAs needs to ____ for every additional 4-5cm of part thickness.

Answer 20

double

Question 21

When using variable kVp/fixed mAs exposure technique charts, kVp is increased by __ for each additional cm of part thickness.

Answer 21

2

Question 22

T/F - When creating technique charts, you only need one for the entire department.

Answer 22

false

Question 23

T/F - When radiographing pediatric patients, you should opt for the longest exposure time possible.

Answer 23

false

Question 24

T/F - Bariatric patients usually require less radiation to image than geriatric patients.

Answer 24

false

Question 25

T/F - Geriatric patients often require less radiation to image due to diminished bone mineralization.

Answer 25

true

Question 26

Plaster casts require ____ radiation to penetrate.

Answer 26

more

Question 27

Fiberglass casts require ____ radiation to penetrate than plaster casts do.

Answer 27

less

Question 28

This kind of pathology can require an increase in technical factors.

Answer 28

additive

Question 29

This kind of pathology can require a decrease in technical factors.

Answer 29

destructive

Question 30

Barium is a ____ contrast

Answer 30

positive

Question 31

Air is a ____ contrast.

Answer 31

negative

Question 32

Negative contrasts show up ____ on x-ray than the surrounding tissue

Answer 32

darker

Question 33

Positive contrast shows up ____ on x-ray than the surrounding tissue.

Answer 33

lighter

Question 34

Amorphous selenium is used in ____.

Answer 34

direct DR

Question 35

Amorphous silicon is used in ____.

Answer 35

indirect DR

Question 36

This is the most inferior piece of the sternum.

Answer 36

xiphoid process

Question 37

T/F - SC joints are more lateral than AC joints.

Answer 37

false

Question 38

The kidneys are ____

Answer 38

retroperitoneal

Question 39

T/F - The hamate is a bone in the foot.

Answer 39

false

Question 40

Which view is best for visualizing the ankle mortise.

Answer 40

15 degree oblique