Radiology

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Author:
sweetpea281
ID:
43169
Filename:
Radiology
Updated:
2010-10-20 19:29:32
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Quiz1
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quiz 1
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  1. what are films with low contrast and great or equal to 90 kVp good for?
    useful for detection of perio and periapical disease, also has many shades of gray
  2. what is the purpose of collimation of the xray beam?
    reduces the diameter of the primary beam
  3. what provides the greatest reduction in radiation to the patient?
    film w/fast emulsion speed
  4. which component of the tubehead aims and shapes the beam?
    PID
  5. what are the electrons are generated by?
    tungsten filament in the cathode
  6. what is the purpose of the anode?
    to convert electrons into x-ray photons
  7. what part of the x-ray beam is most detrimental to the patient and operator
    scatter radiation
  8. when kvp is increased what happens to the xray beam?
    a higher energy x-ray beam with higher penetrating ability results
  9. low contrast film greater than or equal to 90 kvp is useful for?
    detection of perio andperiapical diseases and has many shades of gray
  10. _____ regulates the quantity of electrons produced at the cathode
    mA
  11. 10 mA, exposure 3 seconds = 30 mA sec. if mA is increased to 15, time = ____ seconds to
    maintain the same density (30 mA sec)
    2 seconds
  12. what is affected if the mA changes and the kvp is the same setting
    density
  13. what percent of electron energy is converted to x-rays
    1%
  14. what does collimation do?
    reduces the diameter of the primary beam
  15. radio intense screens are used to
    reduce exposure time
  16. how many impulses are in one second in an x-ray timer?
    60
  17. secondary (scatter) originates when?
    x-rays strike matter
  18. source to film distance increased without changing exposure time =
    lighter image
  19. increase of mA and same kvp=
    increase of generated x-rays, increase of quantity of electrons
  20. Which can occur when x-ray photons interact with matter and is responsible for producing densities on film that make radiography possible?
    no interaction
  21. ________ the emission and propagation of energy through space or material in the form of waves or stream of particles
    ________ the process by which certain unstable atoms or elements undergo spontaneous disintegrationin an effort to attain a more balanced nuclear state.
    • radiation
    • radioactivity

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