RAD-172 QUIZ 1 REVIEW- INTENSIFYING SCREENS

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Author:
anatomy12
ID:
262889
Filename:
RAD-172 QUIZ 1 REVIEW- INTENSIFYING SCREENS
Updated:
2014-02-22 12:23:36
Tags:
XRAY
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Description:
XRAY
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  1. Intensifying screens are used to _____
    reduce patient dose
  2. What quality control test is done to sepcifically test for poor film/screen contact
    wire mesh test
  3. the phosphor layer of the screen lies between the
    reflective layer and protective coat
  4. what material maybe used in the reflective layer of the screen
    titanium dioxide
  5. how much of the latent image is formed by xray photons
    1%
  6. How does the presence of a reflective layer affect patient dose
    it increases the amount of light hitting the film thereby decreasing patient dose
  7. why is a high atomic number desirable for intensifying screen phosphors
    to increase the probability of an photoelectric incident xray interaction
  8. the ability of a phosphor to emit light per xray photons interaction as possible is a measurement of its
    conversion efficiency
  9. what type of luminescence is unfavorable for intensifying screens
    phosphorescence
  10. why have rare earth phosphors gained widespread acceptance
    they offer increased speed while maintaining resolution
  11. the emission spectra for gadolinium oxysulfide
    green
  12. as conversion efficency increases
    patient dose decreases
  13. _______ phosphor size decreases resolution/recorded detail
    increase
  14. the normal life of intensifying screens is
    5-7 years
  15. what is the radiographic result when the film has a loss of contact with the phosphor layer
    increased radiographic density
  16. list the components of the intensifying screen when a photon hits it
    • photon hits
    • film then phosphor layer then reflective layer then base
  17. what would be the result of mismatching screen emission spectra to film sensitivty
    the film would be underexposed
  18. what can be done to improve quantum mottle
    increase mas
  19. under ideal conditions, the naked eye can resolve approximately
    10-20lp/mm

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