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32 Cards in this Set
- Front
- Back
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Film Base
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A blue-tinted, transparent sheet of polyester plastic, makes up the base of the radiographic film. The main purpose is to provide a support for the emulsion. |
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Emulsion
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Consists of a mixture of gelatin and silver halide crystals (covers both sides of the film base)
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Silver Halide Crystal
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Comprised of 95 percent silver bromide and 5 percent silver iodine |
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Latent Image
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Before the radiographic film is developed the, the image, which cannot yet be seen, is called... |
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Manifest Image
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The actual radiographic image that is visualized after the film is processed is called... |
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Nonscreen Film
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Sensitive to direct action of x-ray and is used only in special application. Is used in a cardboard holder and is not recommended for use in Florida. |
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Screen Film
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Sensitive to the fluorescent light of the intensifying screen. |
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Light-tight
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Radiographic film in sensitive to light, it is protected by a ... film holder until it is exposed and processed. |
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Radiolucent
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Radiation can pass through to expose the film emulsion.
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Cardboard Holder
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Is a lightproof envelope for holding the film. |
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Cassette
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Is a light-tight film holder that contains intensifying screens and film. |
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Intensifying Screens
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Are thin, fluorescent sheets of plastic or cardboard inside the cassette. They are used in the production of nearly all medical radiographs to reduce radiation needed to make exposure. |
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Protective Coating
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Protects the phosphor crystals, makes the screens resident to abrasion and damage from handling, prevents the buildup of static electricity, and provides a surface to facilitate cleaning. |
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Active Layer
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Converts the x-radiation beam energy into light energy. |
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Reflective Layer
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Made from shiny substance such as magnesium oxide or titanium dioxide, intercepts the light emitted by active phosphor crystals with equal intensity in all directions and reflects it towards the film. |
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Base
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Must be radiolucent, rugged, chemically inert, flexible, and free from impurities. |
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Fluorescence
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The emission of light during the stimulation of the phosphor is know as ... |
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Phosphorescence
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The continued emission of light by the phosphor after the exposure has ceased is known as ... |
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Screen Lag
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Unwanted condition |
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Speed
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Less than 100 (slow), 100 (medium), greater than 100 (fast) |
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Grid
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Parallel strips of lead alternating with relatively radiotransparent substance- aluminum, wood, or plastic. |
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Grid Ratio
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The ratio of the height of the lead strips to the distance between two strips. The higher the ratio, the more scatter radiation the grid absorbs. |
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Strip Density (Grid Frequency)
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The number of lead strips per inch is known as ...
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Linear Grid |
Constructed with parallel grid strips. Least expensive but only clean up scattered radiation in one direction. |
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Crossed Grid |
Had lead grid strips running parallel to the long and short axes. More expensive but cleans up scattered radiation in many directions. |
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Grid Cutoff |
Absorption of the x-ray beam by the grid is called ... |
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Focused Grid |
Designed to minimize grid cutoff. |
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Moving Grid |
Grid which is moved by any mechanism. |
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Stationary Grid |
Grid used without a moving mechanism. |
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Automatic Phototimer |
Device measures the radiation transmitted through the patient and stops the exposure after the desired amount of radiation has reached the film. |
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Immobilization Devices |
Helps reduce radiation exposure- don't have to retake image. |
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X-ray Table |
Bakelite, plastic, or graphite, designed to let as many x-rays go through as possible without affecting the radiographic image. |
