Term
| used to amplify the affects of incoming xray beam and produce a large amount of light photons |
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Definition
| purpose of intensifying screen |
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Term
| intensifying screens are normally used in ___ |
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Definition
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Term
base
reflective layer
phosphor layer
protective coating |
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Definition
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Term
layer farthest from film
1 mm thick
chemically inert |
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Definition
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Term
made of magnesium oxide or titanium dioxide
adds nearly twice as much light to film, improves efficiency |
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Definition
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Term
the active layer
converts xray beam into visible light |
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Definition
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Term
active substance of most phosphor screens before 1980
embedded in a polymer matrix |
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Definition
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Term
composed of gadolinium, lanthanum, and yttrium
newer and faster of the intensifying screens |
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Definition
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Term
layer closest to the radiographic film
eliminates buildup of static electricity
transparent |
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Definition
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Term
| two types of luminescence |
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Definition
| fluorescence and phosphorescence |
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Term
visible light is emitted only when phosphor is stimulated
instantaneous emission |
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Definition
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Term
occurs if the phosphor continues to emit light after stimulation
delayed emisison |
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Definition
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Term
| spatial resolution is limited by |
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Definition
| effective focal spot size |
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Term
| high speed screens have ___ spatial resolution |
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Definition
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Term
appears as a speckled background
occurs when fast screens and high kVp techniques are used |
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Definition
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Term
an insufficient quantity of photons striking the intensifying screens
image will appear grainy |
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Definition
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Term
| an increase in ___ eliminates quantum mottle |
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Definition
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Term
| speed/sensitivity of the intensifying screen is controlled by |
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Definition
phosphor layer thickness
size of phosphor crystals |
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Term
| causes of white spots on film |
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Definition
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Term
| intensifying screens should be cleaned |
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Definition
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