Term
| The tendency of a luminescent compound to continue to give off light after x-radiation has stopped. |
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Definition
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Term
| A transparent flexible polyester support layer of radiographic film |
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Definition
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Term
| A lightproof encasement designed to hold x-ray film and intensifying screens in close contact. |
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Definition
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Term
| A layer of radiographic film made of gelatin containing suspended silver halide crystals |
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Definition
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Term
| The exposure range of a film that will produce acceptable densities |
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Definition
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Term
| A special radiographic diagnostic method by which a "live view" of the internal anatomy is possible |
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Definition
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Term
| Sheets of luminescent phosphor crystals bound together and mounted on a cardboard or plastic base |
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Definition
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Term
| An invisible image on the x-ray film after it is exposed to ionizing radiation or light before processing |
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Definition
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Term
| Film that is more sensitive to ionizing radiation than to fluorescent light |
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Definition
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Term
| An artifact of faster screens that results in density variation due to random spatial distribution of the phosphor crystals within the screen |
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Definition
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Term
| A layer of an intensifying screen that reflects the light from the phosphor layer toward the film |
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Definition
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Term
| Film with silver crystals that is more sensitive to fluorescent light emitted form intensifying screens than to ionizing radiation |
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Definition
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Term
| A compound of silver and bromine, chlorine, or iodine, all of which are in the halogen group of elements |
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Definition
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Term
| A clear protective layer on radiographic film |
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Definition
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Term
| How often should screens be cleaned |
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Definition
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Term
| What is material can the front of a cassette be made of? |
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Definition
| Aluminum, polycarbonate, magnesium and carbon fiber |
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Term
| The back of a cassette is lined with this material to help in prevention of backscatter which would cause fogging of the film |
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Definition
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Term
| The area marked in the corner of the cassette front to indicate the prescence of a lead blocker is approximately what in measurement? |
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Definition
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Term
| Inside the cassette, both sides can be lined with what material to ensure close contact of the film and screens? |
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Definition
| Felt or Foam Pressure Pads |
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Term
| How many intensifying screens are normally inside the cassette to sandwhich the x-ray film? |
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Definition
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Term
| Over 95% of the exposure to film is due to: |
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Definition
| Light emitted form the intensifying screens |
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Term
| What layers make up intensifying screens? |
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Definition
- Base or support
- Reflective layer
- Phosphor crystal layer
- Protective coat
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Term
| Rare-earth phosphors fall in the___light part of the spectrum. |
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Definition
Green
Note: Calcium Tungastate falls under the blue light part of the spectrum |
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Term
True or False
The light conversion of rare-earth screen is four times as great as that of calcium tungstate screen. |
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Definition
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Term
True or False
Within certain limits, the larger the crystals the greater its light emulsion resulting in less x-radiation necessary to expose the x-ray film |
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Definition
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Term
| In radiography, screen speed is inversely proportional to the exposure required to produce a given effect. So if a fast screen requires a small exposure a slow screen requires _____. |
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Definition
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Term
| An invisible image on a film after exposure to xrays and before developing due to silver halide crystals in the film absorbing x-rays and splitting apart |
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Definition
Latent Image
Note:Partially split crystals convert and turn black unecposed crystals are cleared away from the film in the fixer |
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Term
| What is the most common versatile speed? |
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Definition
| 300-400 speed (medium speed) |
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Term
True or False
Screened film has greater detail then non-screen film |
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Definition
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Term
| Film care/storgae: The film should be held vertically kept in a cool place (50-59°F) and should be kept at low humidity (____). |
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Definition
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