SWGTC-R/T-Chapter 13-Wallace-Intensifying Screens
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| Two parts of an intensifying screen. | base and an active layer
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| What is the base of an intensifying screen made of? | piece of cardboard or plastic
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| Why does the base have a white reflective surface? | to direct light given off by the intensifying screen back to the film.
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| Layers of an intensifying screen | base, reflecting layer, active layer
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| what is the active layer of an intensifying screen made of? | microscopic crystals of a phospor suspended in a matrix
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| What do the phospors do? | give off light when struck by the x-ray photons
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| In areas where not a lot of radiation got through the patient, the light from the phospors will ______________________. | not be very bright.
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| areas that are exposed by only a little light will develop as a ____________. | light grey tone or white.
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| isotropically | in all directions
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| ability of a material to giveoff light when struck by x-rays. | flourescence
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| _______________ is a problem that can occur in older intensifying screens. | phosphorescence
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| phosphorescence | continued light emission after the x-rays have been turn off
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| phosphorescence causes _____________ density | increased
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| Fast screens emit __________ than slower screens. | more light
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| The density is greater in _________ screens. | fast
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| ___________ screens decrease patient dose, but also cause a decrease in ______________. | fast, recorded detail
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| Poor screen contact _____________ recorded detail. | reduces
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| Why is the wire mesh test performed? | to check for areas of poor screen contact
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| Two types of intensifying screens used today. | calcium tungstate and rare earth
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| this screen's phospors emit a blue-violet light hen struck by x-ray photons | calcium tungstate
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| This type of intensifying screen emits a yellow light when struck by x-ray photons. | rare earth
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| This type of intensifying screen is able to produce about the same amount of recorded detail as the other, but does so with a reduced radiation dose to the patient. | rare earth
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| True/False: It is not neccesary to change exposure factors when changing screen speeds. | False: exposure factors must be changed to prevent the film from being too light or too dark.
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