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XR 102

Chapter 8

what is the purpose of the cassette? prevent light from exposing the film maintaining good film-screen contact
what is the purpose of the intensifying screen? to reduce the exposure required to produce the image
what color light do rare earth phospohors emit? green, green yellow blue, blue-violet
where does the light come from that exposes the film? the intensifying screens
which phosphor was used previously, but is now obsolete? calcium tungstate
rare earth intensifying screens are about how many times more efficient than calcium tungstate intensifying screens? 4 time more efficient
what is spectral emissions? the color of light emitted by a phosphor
what is the term we use to describe the efficiency of a screen in converting xrays to light? screen speed
a screen with a greater efficiency requires less exposure, so the screen is said to be _____? faster
large crystals and a thick phosphor layer produce (more or less)______ film exposure and (more or less) ______radiographic detail? large crystals produce MORE exposure and LESS recorded detail
screens with RS (relative speed) 200-600 are used for what type of radiography? routine or general radiography
fine phosphors in a thin layer provide (lesser or greater)_______ radiographic detail, and require (more or less) ______ exposure? fine phosphors produce GREATER recorded detail, and require MORE exposure
screens with the RS (relative speed)of 50-100 are (slower or faster)_____ than regular screens, and provide (high or low)_____ detail images for small anatomical parts screens with a RS of 50-100 are SLOWER and provide HIGH detail images
Quantum mottle will become more or less pronounced as the speed of the intensifying screen increases? MORE pronounced
A discharge of static electricity may expose the film, creating _____ _____ _____ on the radiograph black static artifacts
how frequently should we clean the intensifying screens in our radiology department? every 3 months
when we store film, should we store it flat, or on edge? on edge
poor film-screen contact is a condition that exists when the 2 intensifying screens are ______ not in firm contact with both surfaces of the film
what is the name of the quality control test we perform on the cassettes to check the film-screen contact? screen contact mesh test
how often should we be performing the mesh on the cassettes? semiannually
what is the term used to describe the fact that the xray film has emulsion on both sides of it? duplitized
what is the term used to describe the radiographic film along with contrast? latitude
True or False: latitude and contrast and inversely related TRUE
when we are referring to the sensotometric or H&D curve, what does the toe of the curve represent? base + fog
when we are referring to the sensotometric or H&D curve, what does the shoulder of the curve represent? D-max
when we are referring to the sensotometric or H&D curve, what does the body of the curve represent? Density
what does the D-max portion of the H&D curve represent? the films maximum density
what does the base + fog portion of the H&D curve represent? the amount of light absorbed by the film plus any fog exposure to the film BEFORE processing
what does the straight-line portion of the H&D curve represent? film speed
The closer the straight line portion of the H&D curve graph is to the left, the (slower or faster) the film is? FASTER