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XR 102
Chapter 8
| Question | Answer |
|---|---|
| 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 |
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cambridgeuniversity
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