Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics 2 > Ch. 13 Exposure Technique Selection > Flashcards

Ch. 13 Exposure Technique Selection Flashcards

1
Q

a system that controls the duration of the exposure, thereby controlling the amount of radiation that is used

A

AEC - automatic exposure control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what are the 2 types of AEC radiation detector systems

A
  • phototimers
  • ionization chambers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

these use a fluorescent screen coupled with a photomultiplier (PM) tube or a photodiode

A

phototimers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

these convert light into electrical signal

A

photomulitplier (PM) tubes and photodiodes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

phototimer AECs are what type of devices

A

exit-type - radiation passes through the IR before it can be measure and used to terminate exposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what are most AEC devices now

A

ionization chambers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

a hollow cell filled with air, connected to a timer circuit via electrical wire

A

ionization chamber

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ionization chambers are what type of devices

A

entrance-type - positioned in front of the IR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what do ionization chambers measure

A

DAP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

which AEC device is less sophisticated and less accurate

A

ionization chambers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

which AEC device is less prone for failure

A

ionization chambers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

AEC only controls this

A

quantity of radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

does AEC have an effect on contrast

A

no

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

using a higher kVp with AEC will result in this

A

shorter exposure time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

using lower kVp with AEC will result in this

A

longer exposure time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

lower mA will result in this

A

longer exposure time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

this is the shortest exposure time that a system can produce

A

minimum response

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

is minimum response time usually longer with AEC systems

A

yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

maximum length of time an exposure can go when using AEC

A

backup time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

when setting a backup timer, the tech should set it to terminate the exposure at what percent of the desired exposure

A

150-200%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

exposure adjustment is also known as this

A

density controls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

AEC is designed to compensate for changes in this

A

patient thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

destructive pathologies may cause this (using AEC)

A

underexposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

additive pathologies can cause this (using AEC)

A

overexposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

a series of pre-built exposure techniques that a radiographer can quickly select from when preparing to image a patient

A

anatomic programming

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

exposures need to be able to be reproduced using the same technical factors that provide mR reading within ___% of each other, and with pixel brightness levels within ___% of each other

A

5%, 30%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

how much is kVp increased for every cm increase in part thickness

28
Q

mAs is adjusted by a factor of 2 for every how many cm change in part thickness

29
Q

do fiberglass casts require technique change

30
Q

do plaster casts require technique changes

31
Q

do splints require a technique change

A

not unless stabilizing piece is over anatomy of interest

32
Q

if the disease is an additive pathology what do you need to do to technique

33
Q

if the disease is a destructive pathology what do you need to do to technique

34
Q

how does positive contrast show up on an x-ray

35
Q

how does negative contrast show up on an x-ray

36
Q

what might you need to do to technique when using a positive contrast

37
Q

what might you need to do to technique when using a negative contrast

A

typically no change

38
Q

what type of disease is an aortic aneurysm

39
Q

what type of disease is ascites

40
Q

what type of disease is cirrhosis

41
Q

what type of disease is hypertrophy

42
Q

what type of disease is a bowel obstruction

A

destructive

43
Q

what type of disease is free air

A

destructive

44
Q

what type of disease is atelectasis

45
Q

what type of disease is congestive heart failure

46
Q

what type of disease is malignancy

47
Q

what type of disease is pleural effusion

48
Q

what type of disease is pneumonia

49
Q

what type of disease is emphysema

A

destructive

50
Q

what type of disease is pneumothorax

A

destructive

51
Q

what type of disease is hydrocephalus

52
Q

what type of disease is metastases (osteoblastic)

53
Q

what type of disease is osteochondroma

54
Q

what type of disease is paget disease (late stage)

55
Q

what type of disease is gout

A

destructive

56
Q

what type of disease is metastases (osteolytic)

A

destructive

57
Q

what type of disease is multiple myeloma

A

destructive

58
Q

what type of disease is paget disease (early stage)

A

destructive

59
Q

what type of disease is an abscess

60
Q

what type of disease is edema

61
Q

what type of disease is sclerosis

62
Q

what type of disease is atrophy

A

destructive

63
Q

what type of disease is emaciation

A

destructive

64
Q

what type of disease is malnutrition

A

destructive

65
Q

diseases or conditions that increase the absorption characteristics of the part, making it more difficult to penetrate

A

additive diseases

66
Q

diseases or conditions that decrease the absorption characteristics of the part, making the part less difficult to penetrate

A

destructive diseases

Physics 2 (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions