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intensifying screens

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