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RAD-172 QUIZ 1 REVIEW- INTENSIFYING SCREENS
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Intensifying screens are used to _____
reduce patient dose
What quality control test is done to sepcifically test for poor film/screen contact
wire mesh test
the phosphor layer of the screen lies between the
reflective layer and protective coat
what material maybe used in the reflective layer of the screen
titanium dioxide
how much of the latent image is formed by xray photons
1%
How does the presence of a reflective layer affect patient dose
it increases the amount of light hitting the film thereby decreasing patient dose
why is a high atomic number desirable for intensifying screen phosphors
to increase the probability of an photoelectric incident xray interaction
the ability of a phosphor to emit light per xray photons interaction as possible is a measurement of its
conversion efficiency
what type of luminescence is unfavorable for intensifying screens
phosphorescence
why have rare earth phosphors gained widespread acceptance
they offer increased speed while maintaining resolution
the emission spectra for gadolinium oxysulfide
green
as conversion efficency increases
patient dose decreases
_______ phosphor size decreases resolution/recorded detail
increase
the normal life of intensifying screens is
5-7 years
what is the radiographic result when the film has a loss of contact with the phosphor layer
increased radiographic density
list the components of the intensifying screen when a photon hits it
photon hits
film then phosphor layer then reflective layer then base
what would be the result of mismatching screen emission spectra to film sensitivty
the film would be underexposed
what can be done to improve quantum mottle
increase mas
under ideal conditions, the naked eye can resolve approximately
10-20lp/mm
Author
anatomy12
ID
262889
Card Set
RAD-172 QUIZ 1 REVIEW- INTENSIFYING SCREENS
Description
XRAY
Updated
2014-02-22T17:23:36Z
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