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Chapter 13

SWGTC-R/T-Chapter 13-Wallace-Intensifying Screens

QuestionAnswer
Two parts of an intensifying screen. base and an active layer
What is the base of an intensifying screen made of? piece of cardboard or plastic
Why does the base have a white reflective surface? to direct light given off by the intensifying screen back to the film.
Layers of an intensifying screen base, reflecting layer, active layer
what is the active layer of an intensifying screen made of? microscopic crystals of a phospor suspended in a matrix
What do the phospors do? give off light when struck by the x-ray photons
In areas where not a lot of radiation got through the patient, the light from the phospors will ______________________. not be very bright.
areas that are exposed by only a little light will develop as a ____________. light grey tone or white.
isotropically in all directions
ability of a material to giveoff light when struck by x-rays. flourescence
_______________ is a problem that can occur in older intensifying screens. phosphorescence
phosphorescence continued light emission after the x-rays have been turn off
phosphorescence causes _____________ density increased
Fast screens emit __________ than slower screens. more light
The density is greater in _________ screens. fast
___________ screens decrease patient dose, but also cause a decrease in ______________. fast, recorded detail
Poor screen contact _____________ recorded detail. reduces
Why is the wire mesh test performed? to check for areas of poor screen contact
Two types of intensifying screens used today. calcium tungstate and rare earth
this screen's phospors emit a blue-violet light hen struck by x-ray photons calcium tungstate
This type of intensifying screen emits a yellow light when struck by x-ray photons. rare earth
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
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.
Created by: kristinalyn on 2006-10-29



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