Radio Exam 2 Flashcards Preview

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Flashcards in Radio Exam 2 Deck (73):
1

Calibration of dental X-ray equipment can be performed by a dentist, hygienist or assistant

Flash

2

Annual tests for dental X-ray machines can be performed by a dentist, hygienist, or assistant

True

3

For quality control purposes, each new box of unopened film should be tested for film freshness and fogging before use

True

4

After processing, fresh film that has been properly stored and protected will appear

Clear with slight blue tint

5

After performing the screen film contact test, a wire mesh image of uniform density appears. These results indicate

Adequate film-screen contact

6

When functioning properly, a viewbox should emit a uniform and intense light

False

7

One of the most critical areas of quality control that requires daily monitoring is

Processing of film

8

The coin test is used to check

Proper safelighting

9

The following must be closely monitored with manual processing techniques

Temp of water bath, levels of processing solution, accuracy of timer/thermometer

10

On the average, processing solutions should be changed

Every 3 to 4 weeks

11

On the average, processing solutions should be replenished

Once daily

12

Fresh films and fresh chemicals must be used when preparing reference radiographs

True

13

A reference radiograph is used to check

Strength of the developer solution

14

The densities seen on the daily image appear lighter than the densities seen on the reference radiograph; this result indicates that

The developer solution is too weak/too cold

15

The clearing test is used to monitor

Fixer strength

16

Regardless of who actually exposes the patient to radiation, the dentist is ultimately responsible for the diagnostic quality of all dental images

True

17

What happens to image when the object-receptor distance is increased

Image magnification and loss of definition

18

What piece of equipment is required to hold the receptor parallel to the long axis of the tooth

Film holder

19

What do the letters X,C,P refer to

X=extension C=cone (PID) P=paralleling

20

What size receptor is typically used with the anterior RINN XCP instrument

Size 1 (in book)OCC/offices size 2

21

What size receptor is used for posterior RINN XCP instrument

Size 2

22

Which beam alignment devices are recommended for use with paralleling tech to reduce radiation exposure

Precision film holders RINN XCP instruments with snap on rings

23

How is patients head positioned before exposing receptors

Maxillary arch parallel to floor and midline perpendicular to the floor

24

Why is increased target receptor distance required in the paralleling tech

To avoid image magnification

25

Which describes the relationship of the central ray to the receptor in the paralleling tech

90 degrees to the receptor and long axis of the tooth

26

Right angle

Formed by two perpendicular lines

27

Which describes the relationship between the receptor and that long axis of the tooth with paralleling tech

Receptor and tooth are parallel to each other

28

What describes the distance between the receptor and the tooth in parallel tech

Receptor placed away from tooth and toward middle of oral cavity

29

What are advantages of paralleling tech

Increased accuracy, simplicity of use, ease of duplication

30

Advantages of paralleling outweigh disadvantages

True

31

If the lack of parallelism is less than ______ the image is generally acceptable

20

32

What happens to dental image when a short PID is used

Magnification

33

Which size receptor used with bisecting tech

1 or 2

34

Which beam alignment device recommended for bisecting tech because it aids in alignment of PID and reduces exposure

RINN BAI instruments

35

Proper direction of central ray in bisecting tech

90 degrees to imaginary bisector

36

Distance between receptor and tooth in bisecting tech

Receptor placed as close as possible to tooth

37

Advantage of bisecting tech

Shorter exposure time

38

Disadvantages of bisecting outweigh advantages

True

39

Anatomic order refers to how teeth are arranged in dental arches

True

40

A clear film mount is preferred for better interpretation of radiographs

False

41

Only the dentist is qualified to mount dental radiographs

False

42

Films may be mounted at any time after processing

False

43

Film viewing refers to the placing of films in a supporting structure

False

44

If viewbox screen is not completely covered by the mounted radiographs, the harsh light around the mounted films must be masked to reduce glare and for better interpretation

True

45

Optimal viewing conditions are typically present in the dental setting

False

46

Rule of isometry

Central ray hits receptor to make 90 degree angle with bisector

47

Elongation

Too little/flat angulation

48

Foreshortening

Too much/steep angulation

49

To conduct the film-screen contact test,the PID should have a _____-inch target-film distance

40

50

Areas of poor film-screen contact appear darker than good contact areas

True

51

To conduct the coin test, the film and coin are exposed for

3-4 minutes

52

How to test automatic film processor

Unwrap two unexposed films, expose one to light, and then process both film in the automatic processor

53

A reference radiograph is compared with a radiograph taken each day for matched

Density

54

When the stepwedge tech is used to evaluate developer strength, if density on the daily radiograph differs from that on the standard radiograph by more than ____ steps, the developer solution is depleted

2

55

The clearing test is used to monitor

Fixer strength

56

Incisive foramen maxilla anterior

Radiolucent

57

Anterior border of maxillary

Radiopaque

58

Nasal septum maxilla anterior

Radiopaque

59

Soft tissue of nose maxilla anterior

Radiopaque

60

Maxillary sinus maxilla posterior

Radiolucent

61

Maxillary tuberosity maxilla posterior

Radiopaque

62

Lingual foramen anterior mandible

Radiolucent

63

Mental foramen posterior mandible

Radiolucent

64

Denton and decay are

Radiolucent

65

Enamel is

Radiopaque

66

Posterior indicator arm

2 curves in metal

67

Anterior ring

Extension located off to the side rather than straight

68

Steps for fresh film test

Prepare the film by unwrapping unexposed film, process film. If clear then good if foggy may be expired

69

Safelight coin test

Prep the darkroom turn off all lights in darkroom, prep film unwrap and place 4 feet from safelight place coin on top, turn on safelight and expose for 3-4 minutes, process film

70

Clearing test steps

Unwrap and place immediately in fixer, measure time takes film to clear if fast fixer is right strength

71

Rules for paralleling tech

Receptor placement, receptor position, vertical angulation, horizontal angulation, receptor exposure

72

Radiopaque

Can't see through

73

Radiolucent

Can see through