intensifying screens
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each of the black spaces below before clicking
on it to display the answer.
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| what is a intensifying screen used for | used for lowers the patients dose
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| what is a intensifying screen | a device that converts the energy of the x-ray beam into visible light
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| what is psp | Digital IR:photostimulable phosphor plate
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| what is psp used for | used in CR is barium flourochalide bromides with europium activitors
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| what is DR radiation detectors made of | amorphous selenium
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| what are the layers of the intensifying screens | base,reflective layer,phosphor layer,propective coating
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| what does the protective coating do | closest to the film,protects screen from damage,help eliminate static electricity
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| what does the phosphor layer do | active layer of screen
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| what are our screens made out of | lanthanum and yttranium
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| what converts the x-ray beam into light | the phosphor
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| what does the reflective layer do | increases the efficiency of the beam
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| what is isotopic emission | radiation with equal intensities in all directions.
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| what does the base do | mechanical support for phosphor layer
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| what is the base made out of | polyester
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| what is luminescence | the light emitted from the screen
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| what does luminescence do | excite the outer electrons and forms light as they fall back into place
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| what are the 2 types of luminescence | flouorescence and phosphorescence
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| what is flouorescence | if visible light is emitted,only when the phosphor is stimulated
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| what is phosphorescence | if the phosphor continues to emit light after stimulation(screen lag/afterglow)
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| what does the screen speed tell us | describes how efficiency x-rays are converted into light
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| what is the intensification factor | the ratio of the exposure require to produce the same optical density with a screen to the exposure required to produce a optical density without a screen
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| what is the intensification factor | IF=exposure required without screen------------------------------------ exposure required with screen
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| what is the cassette made of | plastic-low atomic# for minimal attenuation of the beam
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| why is metal used as a back cover | to reduce backscatter
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| what do you get if you used faster speed | low contrast,wider latitude,less detail,increase density,less dose.
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| what do you get if you used slower speed | high contrast,narrow latitude,greater detail,decrease density,increase dose
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| why do we do a wire mesh test | checks for good screen-film contact
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| what is film sensitometry | measurement of the response of film to exposures & processing & then measuring & evaluating the densities
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| most screens must be cleaned | every 2 to 3 months,in busy center cleaning every month
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| what are artifacts on the radiograph | undesirable optical densities or blemishes on a radiograph
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| what color is the artifacts after exposure | artifacts appear black
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| what color is the artifact before exposure | artifact appear white
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| radiation fog & safelight fog will do what do density | both will show increased density
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| kink marks(cresent) fingernail or bending will show what density | increased density
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| what is a penetrometer | (step wedge) aluminum steps used to monitor x-ray equipment
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| what is a sensitrometer | used for processor quality control
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| what is a densitometer | instrument that provides a readout of the amount of density on a film
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