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Radiology Quizzes & Trivia

  
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  • 1. 
    The penetrating power of xrays depend on
    • A. 

      Kvp

    • B. 

      Ma

    • C. 

      Film speed

    • D. 

      Focal film distance


  • 2. 
    The size of the collimated beam for intraoral radiology measured at the patient skin is
    • A. 

      1.5 to 1.75 inches

    • B. 

      2.0 to 2.25 inches

    • C. 

      2.75 to 3.00 inches

    • D. 

      3.25 to 3.50 inches


  • 3. 
    Filtration of the xray beam protects the patient by
    • A. 

      Eliminating all radiation from the xray head

    • B. 

      Eliminating weak wavelength xrays from the x ray beam

    • C. 

      Eliminating short wavelength x rays from the xray beam

    • D. 

      Decreasing exposure time


  • 4. 
    The most penetrating xrays have
    • A. 

      Low frequencies

    • B. 

      Soft rays

    • C. 

      Long wavelengths

    • D. 

      Long wavelengths

    • E. 

      Short wavelengths


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

      Cathode ray

    • B. 

      Secondary ray

    • C. 

      Restricted beam

    • D. 

      Central ray


  • 6. 
    The housing of the xray tube is
    • A. 

      Copper

    • B. 

      Plastic

    • C. 

      Tungsten

    • D. 

      Glass


  • 7. 
    As the target film distance is increased there is
    • A. 

      More chance of elongation

    • B. 

      More chance of overlapping

    • C. 

      More chance of foreshortening

    • D. 

      Less distortion


  • 8. 
    Overlapping is a result of
    • A. 

      Incorrect vertical angulation

    • B. 

      Incorrect horizontal angulation

    • C. 

      Excessive bending of the film

    • D. 

      All of the above


  • 9. 
    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
    • A. 

      The same as the first film

    • B. 

      Twofold

    • C. 

      Threefold

    • D. 

      Fourfold


  • 10. 
    Wich cells are the most sensitive to xrays?
    • A. 

      Muscle

    • B. 

      Nerve

    • C. 

      Sperm

    • D. 

      Epithelial


  • 11. 
    Which cells are the least sensitive to x rays?
    • A. 

      Ova

    • B. 

      Blood

    • C. 

      Sperm

    • D. 

      Nerve


  • 12. 
    The first sign of x ray dermatitis is
    • A. 

      Loss of hair

    • B. 

      Purulent exudate

    • C. 

      Erythema

    • D. 

      Pain


  • 13. 
    Scatter radiation is a type of
    • A. 

      Secondary radiation

    • B. 

      Primary radiation

    • C. 

      Stray radiation

    • D. 

      None of the above


  • 14. 
    The lead foil in the xray film packet is used to
    • A. 

      Stop unused radiation

    • B. 

      Tell the front of the film from the back

    • C. 

      Prevent film fogging

    • D. 

      Decrease operator's radiation exposure


  • 15. 
    The quality or penetrating power of secondary radiation is
    • A. 

      More than that of primary radiation

    • B. 

      Less than that of primary radiation

    • C. 

      The same as that of primary radiation

    • D. 

      Unrelated to that of primary radiation


  • 16. 
    If a radiograph remains in the developing solution too long the film will be
    • A. 

      Lighter

    • B. 

      Darker

    • C. 

      Lighter only if the temperature is increased

    • D. 

      Unaffected because time is not a factor


  • 17. 
    Film fog may occur if there is
    • A. 

      A light leak in the darkroom

    • B. 

      Bending of the film

    • C. 

      Reversal of the film

    • D. 

      Extremely thick bone


  • 18. 
    Films not fixed for a long enough period of time will appear
    • A. 

      To have black lines running through them

    • B. 

      To be brittle

    • C. 

      To have a brown tint

    • D. 

      White


  • 19. 
    Film is washed after removing it from the developing solution to
    • A. 

      Remove any debris on the film

    • B. 

      Speed up the developing process

    • C. 

      Stop the developing process

    • D. 

      Remove the precipitated silver salts


  • 20. 
    In order for the developing chemicals to work, the solution must be
    • A. 

      Acidic

    • B. 

      Neutral

    • C. 

      Basic


  • 21. 
    Fixing the film
    • A. 

      Removes the unaffected silver salts

    • B. 

      Removes the affected silver salts

    • C. 

      Softens the film

    • D. 

      Peels the emulsion from the film base


  • 22. 
    The fixing solution is
    • A. 

      Acidic

    • B. 

      Neutral

    • C. 

      Basic

    • D. 

      First basic then neutral after dilution


  • 23. 
    Reticulation is
    • A. 

      Cracking of the film emulsion

    • B. 

      An electric charge in the developing solution

    • C. 

      A latent image

    • D. 

      Due to excess radiation


  • 24. 
    The optimum time temperature relationship for processing dental radiographs is
    • A. 

      74 f for 4 1/2 minutes

    • B. 

      68 F for 6 minutes

    • C. 

      50 F for 5 minutes

    • D. 

      Varied according to manufactures specification


  • 25. 
    The panoramic radiograph is not diagnostic for
    • A. 

      Caries detection

    • B. 

      General survey

    • C. 

      Confirmation of mandibular fractures

    • D. 

      Detection of impacted wisdom teeth


  • 26. 
    Bitewing radiographs are useful in helping to determine
    • A. 

      Interproximal caries

    • B. 

      Proximal bone height

    • C. 

      Fit of crowns

    • D. 

      All of the above


  • 27. 
    The radiograph film is covered with an emulsion of
    • A. 

      Silver bromide salts

    • B. 

      Cellulose

    • C. 

      Silver acetate

    • D. 

      Potassium bromide


  • 28. 
    The raised button on the radiogph aids in
    • A. 

      Processing

    • B. 

      Drying

    • C. 

      Mounting

    • D. 

      Determining film speed


  • 29. 
    Film speed is determined by the
    • A. 

      Amount of silver bromide salt

    • B. 

      Thickness of cellulose acetate base

    • C. 

      Size of the silver bromide crystal

    • D. 

      Side of the film exposed


  • 30. 
    The best technique for reducing the radiation exposure to both patient and operator is the use of
    • A. 

      An automatic timer

    • B. 

      Fast film

    • C. 

      Thinner films

    • D. 

      A thicker cellulose acetate base


  • 31. 
    The most radiolucent structure of a tooth is the
    • A. 

      Enamel

    • B. 

      Dentin

    • C. 

      Cementation

    • D. 

      Pulp chamber


  • 32. 
    The most radiopaque structure of the tooth is the
    • A. 

      Enamel

    • B. 

      Dentin

    • C. 

      Cementation

    • D. 

      Pulp chamber


  • 33. 
    To visualize the two roots on the maxillary first premolar the central ray should be directed.
    • A. 

      Perpendicular to the buccal surface

    • B. 

      Slightly from the mesial surface

    • C. 

      Slightly from the distal surface


  • 34. 
    The operator must avoid
    • A. 

      Stray radiation

    • B. 

      Secondary radiation

    • C. 

      The primary beam

    • D. 

      All of the above


  • 35. 
    The chemicals used in processing solutions are dissolved in
    • A. 

      Cellulose acetate

    • B. 

      Distilled water

    • C. 

      A thick emulsion

    • D. 

      Potassium bromide


  • 36. 
    If an unexposed film is processed it will appear
    • A. 

      White

    • B. 

      Black

    • C. 

      Blue

    • D. 

      Clear


  • 37. 
    Secondary radiation emanates from the
    • A. 

      Patient mouth

    • B. 

      Exposed film

    • C. 

      Closed end of cone

    • D. 

      All of the above


  • 38. 
    To avoid gonadal exposure to x ray which of the follwing may be used
    • A. 

      Higher kvp

    • B. 

      Lead apron

    • C. 

      Finer detailed film

    • D. 

      Increased vertical angulation


  • 39. 
    When radiographs are taken of a pregnant patient
    • A. 

      Periapical rather than bitewing films should be taken

    • B. 

      Bitewing rather than periapical films should be taken

    • C. 

      The patient should be treated as all other patients

    • D. 

      As few film as possible should be taken


  • 40. 
    Who should hold the film in a patient's mouth if he or she is unable to do so
    • A. 

      The dentist

    • B. 

      The assistant

    • C. 

      A friend or relative

    • D. 

      The receptionist


  • 41. 
    When exposing a radiograph the operator should stand
    • A. 

      Al least six feet from the xray head

    • B. 

      Two feet to the right of the primary beam

    • C. 

      Any distance in back of the xray head

    • D. 

      Four feet in front of patient


  • 42. 
    The maximum whole body dose cosidered permissible to those who work with radiation is
    • A. 

      0.1 rem /wk

    • B. 

      1 rem/wk

    • C. 

      10 rems/wk

    • D. 

      100rem/wk


  • 43. 
    The gratest danger to the operator is
    • A. 

      The central ray

    • B. 

      Secondary radiation

    • C. 

      Primary x ray beam

    • D. 

      All of the above are of equal danger


  • 44. 
    Which characteristic of xrays makes them both beneficial and hazardous?
    • A. 

      They destroy tissue

    • B. 

      They cause embolisms

    • C. 

      They use the body's heat

    • D. 

      They cause large fatty deposits to form


  • 45. 
    A technique used to measure the operator 's exposure to radiation is
    • A. 

      To check the color of the operator's fingers

    • B. 

      For the operator to wear a radiation film badge

    • C. 

      The frequency of stomach pains

    • D. 

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


  • 46. 
    A constant source of radiation is
    • A. 

      Strontium 90

    • B. 

      Natural elements

    • C. 

      The sun

    • D. 

      All of the above


  • 47. 
    The amount of radiation a person receives
    • A. 

      Begings anew each day

    • B. 

      Is cumulative only on the skin

    • C. 

      Is cumulative in the entire body

    • D. 

      None of the above


  • 48. 
    Maximum protection of the patient requires that the xray beam pass though a (n)
    • A. 

      Plastic closed ended cone

    • B. 

      Shielded open ended cone

    • C. 

      Water filter

    • D. 

      Oil filter


  • 49. 
    Occlusal films are used to determine
    • A. 

      Mesiodistal orientation of a tooth

    • B. 

      Buccal lingual orientation of a tooth

    • C. 

      The presence of anterior caries

    • D. 

      None of the above


  • 50. 
    Small silver halide crystals on the film result in
    • A. 

      More radiation to the patient

    • B. 

      Better detail

    • C. 

      Slower film

    • D. 

      Faster film

    • E. 

      Film fogging


  • 51. 
    Intensifying screems
    • A. 

      Are used in intraoral films

    • B. 

      Decrease exposure

    • C. 

      Create additional x rays

    • D. 

      Fuse with the film


  • 52. 
    Which extraoral film is used to visualized the sinus?
    • A. 

      Lateral oblique film

    • B. 

      Lateral skull film

    • C. 

      Waters films

    • D. 

      Posterior anterior film


  • 53. 
    The principle used in panoramic radiography is
    • A. 

      Long cone

    • B. 

      Laminography

    • C. 

      Horizontal curvature

    • D. 

      Panoramography


  • 54. 
    The temperature of the radiographic processing solutions is adjusted by
    • A. 

      Individual heaters

    • B. 

      Chemical interaction

    • C. 

      A temperature adjustable water bath

    • D. 

      Gas heaters


  • 55. 
    Which type of film cannot be used intraorally?
    • A. 

      Bitewing

    • B. 

      Occlusal

    • C. 

      Periapical

    • D. 

      None of the above


  • 56. 
    Periapical film
    • A. 

      Show the entire tooth

    • B. 

      Show the supporting structure of the tooth

    • C. 

      Come in various sizes

    • D. 

      All of the above


  • 57. 
    The occlusal plane of the arch being radiographed should be
    • A. 

      Perpendicular to the floor

    • B. 

      Parallel to the floor

    • C. 

      At an angle of 45 degree to the floor

    • D. 

      At an angle of 30 degree to the floor


  • 58. 
    The ala-tragus line is parallel to the floor when taking
    • A. 

      Maxillary periapical films

    • B. 

      Bitewings

    • C. 

      Maxillary occlusal films

    • D. 

      All of the above


  • 59. 
    When using the bisecting the angle technique
    • A. 

      The central beam is perpendicular to the floor

    • B. 

      The central beam is perpendicular to the tooth

    • C. 

      The central beam is perpendicular to the line

    • D. 

      Bisecting the angle formed by the tooth and film

    • E. 

      The central beam is perpendicular to the cheek


  • 60. 
    When using the paralleling technique
    • A. 

      The film is parallel to the tooth

    • B. 

      The film always touches the tooth

    • C. 

      You must use an 8 inch plastic cone

    • D. 

      All of the above


  • 61. 
    Film racks should be
    • A. 

      Clean and dry

    • B. 

      Numbered and lettered

    • C. 

      Neither of the above

    • D. 

      Both of the above


  • 62. 
    Light films will result from
    • A. 

      Underdeveloping

    • B. 

      Overdeveloping

    • C. 

      Underexposure

    • D. 

      Overexposure

    • E. 

      Overfixing


  • 63. 
    Dark films will result from
    • A. 

      Underdeveloping

    • B. 

      Overdeveloping

    • C. 

      Underexposing

    • D. 

      Overexposing

    • E. 

      Overfixing


  • 64. 
    Film placement of the film will help prevent
    • A. 

      Overlapping

    • B. 

      Foreshortening

    • C. 

      Gagging

    • D. 

      Elongation


  • 65. 
    Periapical films should extend beond the occlusal plane
    • A. 

      1/8 inch

    • B. 

      1/4 inch

    • C. 

      3/8 inch

    • D. 

      1/2 inch


  • 66. 
    If a film is exposed on the wrong side the result will be
    • A. 

      Darker films

    • B. 

      No image at all

    • C. 

      No effect

    • D. 

      A herringbone pattern


  • 67. 
    Xray are most effectively stopped by
    • A. 

      A vacuum

    • B. 

      Tungsten

    • C. 

      Copper

    • D. 

      Lead


  • 68. 
    Blurred films may result from
    • A. 

      Incorrect vertical angulation

    • B. 

      Movement of the patient

    • C. 

      Increased kvp

    • D. 

      Old film


  • 69. 
    The usual number of films in a complete dentulous radiographic survey is
    • A. 

      10

    • B. 

      18

    • C. 

      24

    • D. 

      26


  • 70. 
    In the paralleling technique a device which is used to hold the film in the patient's mouth is
    • A. 

      The patient's finger

    • B. 

      A bite block

    • C. 

      A second film

    • D. 

      All of the above


  • 71. 
    Elongation is caused by
    • A. 

      Insufficient vertical angulation

    • B. 

      Too much vertical angulation

    • C. 

      Insufficient horizontal angulation

    • D. 

      Excessive bending of the film


  • 72. 
    Cone cutting results from the central ray
    • A. 

      Not being aimed at the center of film

    • B. 

      Having incorrect horizontal angulation

    • C. 

      Having insufficient vertical angulation

    • D. 

      Being eliminated from a closed plastic cone


  • 73. 
    Black lines across the film may be the result of
    • A. 

      Cone cutting

    • B. 

      Souble exposure

    • C. 

      Excessive bending

    • D. 

      Underexposure


  • 74. 
    Proper patient positioning for intraoral films requires the sagittal plane be
    • A. 

      Parallel to the floor

    • B. 

      Perpendicular to the floor

    • C. 

      Parallel to the central ray

    • D. 

      Perpendicular to the central ray


  • 75. 
    If the sagittal plane of the patient 's head is positioned incorrectly the result may be
    • A. 

      Overlapping

    • B. 

      Elongation

    • C. 

      Darker films

    • D. 

      All of the above


  • 76. 
    Exposure time is determine by
    • A. 

      Kvp

    • B. 

      Ma

    • C. 

      The patient's weight

    • D. 

      Vertical angulation

    • E. 

      Area being radiographed


  • 77. 
    When seating the patient the operator should
    • A. 

      Tell the patient what is being done

    • B. 

      Have the patient remove eyeglasses

    • C. 

      Have the patient remove intraoral removable appliances

    • D. 

      All of the above


  • 78. 
    Vertical angulation in the bisecting technique for the same radiograph may differ in patients due to
    • A. 

      The size of the teeth

    • B. 

      Anatomic differences

    • C. 

      Gagging

    • D. 

      Age


  • 79. 
     a latent image is
    • A. 

      An image taken with a long exposure

    • B. 

      Found on only fast films

    • C. 

      Composed of energized silver halide crystals

    • D. 

      A very light image on the developed film


  • 80. 
    Exposure of a radiograph on a child
    • A. 

      Requires less time than an adult

    • B. 

      Requires more time than an adult

    • C. 

      Requires the same time as an adult

    • D. 

      Should never be taken


  • 81. 
    Which of the following conditions cannot be identified radiographically?
    • A. 

      Herpetic lesions

    • B. 

      Periodontitis

    • C. 

      Salivary stones

    • D. 

      Frenum

    • E. 

      Root tips


  • 82. 
    The strength of the safelight permitted in the darkroom depends on the
    • A. 

      Bulb in the safelight

    • B. 

      Light tightness of the room

    • C. 

      Sensitivity of the film

    • D. 

      Tooth being radiographed


  • 83. 
    Extraoral films are
    • A. 

      More sensitive to light than intraoral films

    • B. 

      Less sensitive to light than intraoral films

    • C. 

      Just as sensitive to light as intraoral films

    • D. 

      Not sensitive to light


  • 84. 
    How often should the processing solutions be changed
    • A. 

      Each week

    • B. 

      Every 3 to 4 weeks

    • C. 

      Every5 to 6 weeks

    • D. 

      Every 7 to 8 weeks


  • 85. 
    The thermometer used to measure the temperature of the processing solutions is located
    • A. 

      In the developer

    • B. 

      In the wash water

    • C. 

      In the fixer

    • D. 

      Above the processing solutions


  • 86. 
    The best way to dry processed films is to
    • A. 

      Place them on paper towels

    • B. 

      Hang them suspending the films in air

    • C. 

      Place them in envelopes

    • D. 

      Place them flat on the counter


  • 87. 
    Extraoral films are placed in rigid frames called
    • A. 

      Fim frames

    • B. 

      Skull plates

    • C. 

      Jaw plates

    • D. 

      Cassttes


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