Radiology 5

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  • 1/35 Questions

    Intraoral film packets must be

    • Resistant to salivary seepage
    • Flexible
    • Light tihgt
    • Easy to open in the darkroom
    • All of the above
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  • 2. 

    Radiographs should always be viewed

    • In a well lit room

    • On a viewbox

    • In the operatory

    • By holding them up to a celling light

    • Using hight from a window

    Correct Answer
    A. On a viewbox
  • 3. 

    Intraoral film packets must be

    • Resistant to salivary seepage

    • Flexible

    • Light tight

    • Easy to open in the darkroom

    • All of the above

    Correct Answer
    A. All of the above
  • 4. 

    The advantage of a film that has emulsion on both sides is that

    • The film requires less radiation exposure

    • The image produced is less distorted

    • The film has less sensitivity to radiation

    • Processing solutions work better

    • The film is easier to mount

    Correct Answer
    A. The film requires less radiation exposure
  • 5. 

    Which of the following materials is most resistant to x radiation?

    • Copper

    • Molybdenum

    • Tungsten

    • Lead

    • Aluminum

    Correct Answer
    A. Lead
  • 6. 

    What is the major advantage in using the fastest speed film and high kilovolt peak?

    • It increases film density

    • It increases film contrast

    • It produces a clearer image

    • It reduces the radiation exposure to the patient

    • It makes film easier and faster to develop

    Correct Answer
    A. It reduces the radiation exposure to the patient
  • 7. 

    The ALARA principles refers to

    • Obtaining informed consent

    • The disinfection procedures recommended in dental radiography

    • Obtaining diagnostically acceptable radiographs with minimal exposure to radiation

    • Decreasing the processing time for exposed radiographs

    • None of above

    Correct Answer
    A. Obtaining diagnostically acceptable radiographs with minimal exposure to radiation
  • 8. 

    Which of the following film sizes is considered to be standard adult film?

    • Size#0

    • Size#1

    • Size#2

    • Size#3

    • Size#4

    Correct Answer
    A. Size#2
  • 9. 

    Which form of radiation can cause ionization of atoms?

    • Radar

    • Microwaves

    • Radio waves

    • Visible light

    • Gamma rays

    Correct Answer
    A. Gamma rays
  • 10. 

    The difference in degrees of blackness on a radiograph is called

    • Density

    • Tone

    • Contrast

    • Fogging

    • Shades

    Correct Answer
    A. Contrast
  • 11. 

    Film fog occurs when all or part of a radiograph is darkened by

    • An imbalance or exhaustion of processing solutions

    • A light leak

    • Improper safelighting

    • Improper safelilghting

    • All of the above are potential sources

    Correct Answer
    A. All of the above are potential sources
  • 12. 

    The device that converts x ray energy into visible light is called a(n)

    • Cassette holder

    • Step down transformer

    • Intensitying screen

    • Nonscreen film

    • Screen film

    Correct Answer
    A. Intensitying screen
  • 13. 

    If the intensitying screens are not in perfect contact with the film which of the following will occur?

    • The screen may be damaged

    • The film may be damaged

    • There will be a light leak

    • There will be a loss of image sharpness

    • A thin film will result

    Correct Answer
    A. There will be a loss of image sharpness
  • 14. 

    The intensity of the beam is affected by the

    • Kilovolt peak

    • Milliamperage

    • Exposure time

    • Focal film distance

    • All of the above

    Correct Answer
    A. All of the above
  • 15. 

    Nonscreen film is routinely used in extraoral radiography

    • True

    • False

    Correct Answer
    A. False
  • 16. 

    How many times per second is the polarity reversed in a dental xray machine operating on an alternating current?

    • 30

    • 15

    • 60

    • 45

    Correct Answer
    A. 60
  • 17. 

    For x ray timers calibrated in impulses how many impulses are there in a second?

    • 10

    • 30

    • 60

    • 120

    • 15

    Correct Answer
    A. 60
  • 18. 

    To what does the term film speed refer?

    • The developing time needed

    • Sensitivity to x radiation

    • Half life

    • Degree of blackness on the exposed radiograph

    • Shelf life

    Correct Answer
    A. Sensitivity to x radiation
  • 19. 

    The intensifying screen that emits blue light and must be used with film that is sensitive to blue light is a

    • Nonlight screen

    • Calcium tungstate screen

    • Rare tungstate screen

    • Rare earth screen

    • Phosphor calcium screem

    Correct Answer
    A. Calcium tungstate screen
  • 20. 

    A long FFD is desirable because

    • More radiation is absorbed by the tissues

    • The resulting radiation is more penetrating

    • More soft radiation strikes the object

    • The central rays of the primary beam are less divergent

    • Overexposure rarely occurs

    Correct Answer
    A. The central rays of the primary beam are less divergent
  • 21. 

    Ionization has occurred when

    • Cell death occurs

    • Photons penetrate matter

    • Radiant energy is converted to heat

    • An electron is displaced from its orbit

    • None of the above

    Correct Answer
    A. An electron is displaced from its orbit
  • 22. 

    Under the new metric system for measuring dose SI the rem replaced by the

    • Rad

    • Gray

    • Sievert

    • Becquerel

    • Curie

    Correct Answer
    A. Sievert
  • 23. 

    In taking dental radiographs the greatest dose of radiation to structures in the patient jaw comes from

    • The primary beam

    • Leakage from the xray machine

    • Scatter from the patient face

    • Scatter from the pid

    • Secondary radiation

    Correct Answer
    A. The primary beam
  • 24. 

    Which of the following travel at the greatest speed?

    • X ray

    • Gamma rays

    • Light

    • Microwaves

    • They all travel at the same speed

    Correct Answer
    A. They all travel at the same speed
  • 25. 

    The advantage of a film that has emulsion on both sides is that

    • The film requires less radiation exposure

    • The image produced is less distorted

    • The film has less sensitivity to radiation

    • Processing solutions work better

    • The film is easier to mount

    Correct Answer
    A. The film requires less radiation exposure
  • 26. 

    Which of the following statements cocerning background radiation is most accurate?

    • It gives us the maximum recommended dosage for radiation exposure

    • It can be avoided if an individual is cautious

    • It is found everywhere

    • It is only present in dental offices and medical facilities

    • None of the above are correct

    Correct Answer
    A. It is found everywhere
  • 27. 

    The best way to clean the intensifying screens in extraoral cassettes is with

    • Detergent

    • Disinfectant solution

    • Cold sterillizing solution

    • Soapy water

    • A wire brush

    Correct Answer
    A. Soapy water
  • 28. 

    Flexible cassettes are

    • Not used because of cracking of the emulsion

    • Are used in all panoramic units

    • Are used in some panoramic units

    • Are used for lateral oblique projections only

    • None of the above

    Correct Answer
    A. Are used in some panoramic units
  • 29. 

    Use of a kilovolt peak between 45 65 profuces

    • Scatter radiation

    • Fogging

    • A blurred image

    • An underexposed film

    • None of the above

    Correct Answer
    A. Scatter radiation
  • 30. 

    Which of the following statement is false concerning film duplication?

    • The films to be duplicated are in close contact with the duplicating film.

    • The shiny side of the film is the nonemulsion side

    • If less film density is needed on the duplicate radiograph the exposure time is shortened.

    • The raised portion of the orientation dot faces toward the light source

    • The radiographs being duplicated should be removed from their respective mounts.

    Correct Answer
    A. If less film density is needed on the duplicate radiograph the exposure time is shortened.
  • 31. 

    If the intensity of a beam of radiation is 12 at a point 12 inches from the target the intensity of the beam at 24 inches is

    • 2

    • 3

    • 4

    • 5

    • 6

    Correct Answer
    A. 3
  • 32. 

    In 16 inch cylinder is used in the paralleling technique to

    • Reduce secondary radiation

    • Avoid magnification of the image

    • Avoid distortion of the image

    • Avoid superimposition of anatomic structures

    • Facilitate correct vertical angulation of the position indicating device pid

    Correct Answer
    A. Avoid magnification of the image
  • 33. 

    Which of the following types of scatter radiation occurs most often with dental x rays

    • Thompson

    • Compton

    • Photoelectric

    • Coherent

    • All of the above occur equally with dental x rays

    Correct Answer
    A. Compton
  • 34. 

    In recent years the focus of prime concern from the effects of ionizing radiation used in dentistry has centered on

    • Somatic damage to the patient

    • Occupational exposure of dental workers

    • Genetic damage to patients

    • Cancer induction in patients

    • Its contribution to background radiation

    Correct Answer
    A. Cancer induction in patients
  • 35. 

    X rays that are most likely to be absorbed by the skin are

    • Those with a short wavelength

    • Aluminum filtered rays

    • Those with ling wavelengths

    • High energy waves

    • Sonic waves

    Correct Answer
    A. Those with ling wavelengths

Quiz Review Timeline (Updated): Jan 17, 2013 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jan 17, 2013
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 10, 2010
    Quiz Created by
    Yarilsa
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