Radiology Best Answer

1. When exposing a radiograph the operator should stand

Al least six feet from the xray head

Two feet to the right of the primary beam

Any distance in back of the xray head

Four feet in front of patient

2. Film fog may occur if there is

A light leak in the darkroom

Bending of the film

Reversal of the film

Extremely thick bone

3. The best technique for reducing the radiation exposure to both patient and operator is the use of

An automatic timer

Fast film

Thinner films

A thicker cellulose acetate base

4. When seating the patient the operator should

Tell the patient what is being done

Have the patient remove eyeglasses

Have the patient remove intraoral removable appliances

All of the above

5. The x ray which is at the center of the primary beam is called the

Cathode ray

Secondary ray

Restricted beam

Central ray

6. To avoid gonadal exposure to x ray which of the follwing may be used

Higher kvp

Lead apron

Finer detailed film

Increased vertical angulation

7. The operator must avoid

Stray radiation

Secondary radiation

The primary beam

All of the above

8. The gratest danger to the operator is

The central ray

Secondary radiation

Primary x ray beam

All of the above are of equal danger

9. A technique used to measure the operator 's exposure to radiation is

To check the color of the operator's fingers

For the operator to wear a radiation film badge

The frequency of stomach pains

To multiply the nunber of films the operator has exposed by 0.1 rem

10. Blurred films may result from

Incorrect vertical angulation

Movement of the patient

Increased kvp

Old film

11. If a radiograph remains in the developing solution too long the film will be

Lighter

Darker

Lighter only if the temperature is increased

Unaffected because time is not a factor

12. The penetrating power of xrays depend on

Kvp

Ma

Film speed

Focal film distance

13. Scatter radiation is a type of

Secondary radiation

Primary radiation

Stray radiation

None of the above

14. Periapical film

Show the entire tooth

Show the supporting structure of the tooth

Come in various sizes

All of the above

15. The best way to dry processed films is to

Place them on paper towels

Hang them suspending the films in air

Place them in envelopes

Place them flat on the counter

16. The most penetrating xrays have

Low frequencies

Soft rays

Long wavelengths

Short wavelengths

17. The first sign of x ray dermatitis is

Loss of hair

Purulent exudate

Erythema

Pain

18. The most radiopaque structure of the tooth is the

Enamel

Dentin

Cementation

Pulp chamber

19. Which characteristic of xrays makes them both beneficial and hazardous?

They destroy tissue

They cause embolisms

They use the body's heat

They cause large fatty deposits to form

20. The radiograph film is covered with an emulsion of

Silver bromide salts

Cellulose

Silver acetate

Potassium bromide

21. The amount of radiation a person receives

Begings anew each day

Is cumulative only on the skin

Is cumulative in the entire body

None of the above

22. The raised button on the radiogph aids in

Processing

Drying

Mounting

Determining film speed

23. A constant source of radiation is

Strontium 90

Natural elements

The sun

All of the above

24. Extraoral films are placed in rigid frames called

Fim frames

Skull plates

Jaw plates

Cassttes

25. Black lines across the film may be the result of

Cone cutting

Souble exposure

Excessive bending

Underexposure

26. Exposure of a radiograph on a child

Requires less time than an adult

Requires more time than an adult

Requires the same time as an adult

Should never be taken

27. Wich cells are the most sensitive to xrays?

Muscle

Nerve

Sperm

Epithelial

28. Which type of film cannot be used intraorally?

Bitewing

Occlusal

Periapical

None of the above

29. Which cells are the least sensitive to x rays?

Ova

Blood

Sperm

Nerve

30. The quality or penetrating power of secondary radiation is

More than that of primary radiation

Less than that of primary radiation

The same as that of primary radiation

Unrelated to that of primary radiation

31. The fixing solution is

Acidic

Neutral

Basic

First basic then neutral after dilution

32. The panoramic radiograph is not diagnostic for

Caries detection

General survey

Confirmation of mandibular fractures

Detection of impacted wisdom teeth

33. Who should hold the film in a patient's mouth if he or she is unable to do so

The dentist

The assistant

A friend or relative

The receptionist

34. The temperature of the radiographic processing solutions is adjusted by

Individual heaters

Chemical interaction

A temperature adjustable water bath

Gas heaters

35. Xray are most effectively stopped by

A vacuum

Tungsten

Copper

Lead

36. The chemicals used in processing solutions are dissolved in

Cellulose acetate

Distilled water

A thick emulsion

Potassium bromide

37. The maximum whole body dose cosidered permissible to those who work with radiation is

0.1 rem /wk

1 rem/wk

10 rems/wk

100rem/wk

38. The usual number of films in a complete dentulous radiographic survey is

10

18

24

26

39. The size of the collimated beam for intraoral radiology measured at the patient skin is

1.5 to 1.75 inches

2.0 to 2.25 inches

2.75 to 3.00 inches

3.25 to 3.50 inches

40. Overlapping is a result of

Incorrect vertical angulation

Incorrect horizontal angulation

Excessive bending of the film

All of the above

41. Reticulation is

Cracking of the film emulsion

An electric charge in the developing solution

A latent image

Due to excess radiation

42. Bitewing radiographs are useful in helping to determine

Interproximal caries

Proximal bone height

Fit of crowns

All of the above

43. If a film is exposed on the wrong side the result will be

Darker films

No image at all

No effect

A herringbone pattern

44. Fixing the film

Removes the unaffected silver salts

Removes the affected silver salts

Softens the film

Peels the emulsion from the film base

45. The most radiolucent structure of a tooth is the

Enamel

Dentin

Cementation

Pulp chamber

46. Secondary radiation emanates from the

Patient mouth

Exposed film

Closed end of cone

All of the above

47. Cone cutting results from the central ray

Not being aimed at the center of film

Having incorrect horizontal angulation

Having insufficient vertical angulation

Being eliminated from a closed plastic cone

48. Film racks should be

Clean and dry

Numbered and lettered

Neither of the above

Both of the above

49. As the target film distance is increased there is

More chance of elongation

More chance of overlapping

More chance of foreshortening

Less distortion

50. Film is washed after removing it from the developing solution to

Remove any debris on the film

Speed up the developing process

Stop the developing process

Remove the precipitated silver salts

51. Filtration of the xray beam protects the patient by

Eliminating all radiation from the xray head

Eliminating weak wavelength xrays from the x ray beam

Eliminating short wavelength x rays from the xray beam

Decreasing exposure time

52. Films not fixed for a long enough period of time will appear

To have black lines running through them

To be brittle

To have a brown tint

White

53. The ala-tragus line is parallel to the floor when taking

Maxillary periapical films

Bitewings

Maxillary occlusal films

All of the above

54. Film speed is determined by the

Amount of silver bromide salt

Thickness of cellulose acetate base

Size of the silver bromide crystal

Side of the film exposed

55. After a film is exposed, the target film distance is doubled. the exposure time necessary to obtain a second film of equal density to the first film is

The same as the first film

Twofold

Threefold

Fourfold

56. Maximum protection of the patient requires that the xray beam pass though a (n)

Plastic closed ended cone

Shielded open ended cone

Water filter

Oil filter

57. How often should the processing solutions be changed

Each week

Every 3 to 4 weeks

Every5 to 6 weeks

Every 7 to 8 weeks

58. In order for the developing chemicals to work, the solution must be

Acidic

Neutral

Basic

59. If an unexposed film is processed it will appear

White

Black

Blue

Clear

60. Dark films will result from

Underdeveloping

Overdeveloping

Underexposing

Overexposing

Overfixing

Submit

61. a latent image is

An image taken with a long exposure

Found on only fast films

Composed of energized silver halide crystals

A very light image on the developed film

62. Vertical angulation in the bisecting technique for the same radiograph may differ in patients due to

The size of the teeth

Anatomic differences

Gagging

Age

63. Intensifying screems

Are used in intraoral films

Decrease exposure

Create additional x rays

Fuse with the film

64. The occlusal plane of the arch being radiographed should be

Perpendicular to the floor

Parallel to the floor

At an angle of 45 degree to the floor

At an angle of 30 degree to the floor

65. Occlusal films are used to determine

Mesiodistal orientation of a tooth

Buccal lingual orientation of a tooth

The presence of anterior caries

None of the above

66. Which extraoral film is used to visualized the sinus?

Lateral oblique film

Lateral skull film

Waters films

Posterior anterior film

67. When using the paralleling technique

The film is parallel to the tooth

The film always touches the tooth

You must use an 8 inch plastic cone

All of the above

68. The housing of the xray tube is

Copper

Plastic

Tungsten

Glass

69. Periapical films should extend beond the occlusal plane

1/8 inch

1/4 inch

3/8 inch

1/2 inch

70. Film placement of the film will help prevent

Overlapping

Foreshortening

Gagging

Elongation

71. When radiographs are taken of a pregnant patient

Periapical rather than bitewing films should be taken

Bitewing rather than periapical films should be taken

The patient should be treated as all other patients

As few film as possible should be taken

72. Extraoral films are

More sensitive to light than intraoral films

Less sensitive to light than intraoral films

Just as sensitive to light as intraoral films

Not sensitive to light

73. The optimum time temperature relationship for processing dental radiographs is

74 f for 4 1/2 minutes

68 F for 6 minutes

50 F for 5 minutes

Varied according to manufactures specification

74. Elongation is caused by

Insufficient vertical angulation

Too much vertical angulation

Insufficient horizontal angulation

Excessive bending of the film

75. The thermometer used to measure the temperature of the processing solutions is located

In the developer

In the wash water

In the fixer

Above the processing solutions

76. Proper patient positioning for intraoral films requires the sagittal plane be

Parallel to the floor

Perpendicular to the floor

Parallel to the central ray

Perpendicular to the central ray

77. The principle used in panoramic radiography is

Long cone

Laminography

Horizontal curvature

Panoramography

78. Which of the following conditions cannot be identified radiographically?

Herpetic lesions

Periodontitis

Salivary stones

Frenum

Root tips

Submit

79. The strength of the safelight permitted in the darkroom depends on the

Bulb in the safelight

Light tightness of the room

Sensitivity of the film

Tooth being radiographed

80. In the paralleling technique a device which is used to hold the film in the patient's mouth is

The patient's finger

A bite block

A second film

All of the above

81. The lead foil in the xray film packet is used to

Stop unused radiation

Tell the front of the film from the back

Prevent film fogging

Decrease operator's radiation exposure

Submit

82. If the sagittal plane of the patient 's head is positioned incorrectly the result may be

Overlapping

Elongation

Darker films

All of the above

83. To visualize the two roots on the maxillary first premolar the central ray should be directed.

Perpendicular to the buccal surface

Slightly from the mesial surface

Slightly from the distal surface

Submit

84. When using the bisecting the angle technique

The central beam is perpendicular to the floor

The central beam is perpendicular to the tooth

The central beam is perpendicular to the line

Bisecting the angle formed by the tooth and film

The central beam is perpendicular to the cheek

85. Light films will result from

Underdeveloping

Overdeveloping

Underexposure

Overexposure

Overfixing

Submit

86. Small silver halide crystals on the film result in

More radiation to the patient

Better detail

Slower film

Faster film

Film fogging

Submit

87. Exposure time is determine by

Kvp

Ma

The patient's weight

Vertical angulation

Area being radiographed

Submit

Radiology Best Answer

1. When exposing a radiograph the operator should stand

2.

What first name or nickname would you like us to use?

2. Film fog may occur if there is

3. The best technique for reducing the radiation exposure to both patient and operator is the use of

4. When seating the patient the operator should

5. The x ray which is at the center of the primary beam is called the

6. To avoid gonadal exposure to x ray which of the follwing may be used

7. The operator must avoid

8. The gratest danger to the operator is

9. A technique used to measure the operator 's exposure to radiation is

10. Blurred films may result from

11. If a radiograph remains in the developing solution too long the film will be

12. The penetrating power of xrays depend on

13. Scatter radiation is a type of

14. Periapical film

15. The best way to dry processed films is to

16. The most penetrating xrays have

17. The first sign of x ray dermatitis is

18. The most radiopaque structure of the tooth is the

19. Which characteristic of xrays makes them both beneficial and hazardous?

20. The radiograph film is covered with an emulsion of

21. The amount of radiation a person receives

22. The raised button on the radiogph aids in

23. A constant source of radiation is

24. Extraoral films are placed in rigid frames called

25. Black lines across the film may be the result of

26. Exposure of a radiograph on a child

27. Wich cells are the most sensitive to xrays?

28. Which type of film cannot be used intraorally?

29. Which cells are the least sensitive to x rays?

30. The quality or penetrating power of secondary radiation is

31. The fixing solution is

32. The panoramic radiograph is not diagnostic for

33. Who should hold the film in a patient's mouth if he or she is unable to do so

34. The temperature of the radiographic processing solutions is adjusted by

35. Xray are most effectively stopped by

36. The chemicals used in processing solutions are dissolved in

37. The maximum whole body dose cosidered permissible to those who work with radiation is

38. The usual number of films in a complete dentulous radiographic survey is

39. The size of the collimated beam for intraoral radiology measured at the patient skin is

40. Overlapping is a result of

41. Reticulation is

42. Bitewing radiographs are useful in helping to determine

43. If a film is exposed on the wrong side the result will be

44. Fixing the film

45. The most radiolucent structure of a tooth is the

46. Secondary radiation emanates from the

47. Cone cutting results from the central ray

48. Film racks should be

49. As the target film distance is increased there is

50. Film is washed after removing it from the developing solution to

51. Filtration of the xray beam protects the patient by

52. Films not fixed for a long enough period of time will appear

53. The ala-tragus line is parallel to the floor when taking

54. Film speed is determined by the

55. After a film is exposed, the target film distance is doubled. the exposure time necessary to obtain a second film of equal density to the first film is

56. Maximum protection of the patient requires that the xray beam pass though a (n)

57. How often should the processing solutions be changed

58. In order for the developing chemicals to work, the solution must be

59. If an unexposed film is processed it will appear

60. Dark films will result from

61. a latent image is

62. Vertical angulation in the bisecting technique for the same radiograph may differ in patients due to

63. Intensifying screems

64. The occlusal plane of the arch being radiographed should be

65. Occlusal films are used to determine

66. Which extraoral film is used to visualized the sinus?

67. When using the paralleling technique

68. The housing of the xray tube is

69. Periapical films should extend beond the occlusal plane

70. Film placement of the film will help prevent

71. When radiographs are taken of a pregnant patient

72. Extraoral films are

73. The optimum time temperature relationship for processing dental radiographs is

74. Elongation is caused by

75. The thermometer used to measure the temperature of the processing solutions is located

76. Proper patient positioning for intraoral films requires the sagittal plane be

77. The principle used in panoramic radiography is