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Radiology
Chapter 8 Vocab
Question | Answer |
---|---|
Radiolucent | A substance that is easily penetrated by the x-ray beam. |
Backscatter | Radiation from the cassette back and the cassette tray that is directed back toward the film. |
Film/screen contact | The tightly pressing of the intensifying screens against the film when the cassette is closed. |
Fluoresce | As phosphors glow, giving off light when exposed to x-rays. |
Phosphors | Fluorescent crystals in the surface of an intensifying screen. |
Screen speed | The efficiency of a screen in converting x-rays to light. |
Rare earth phosphors | Crystals containing either gadolinium, lanthanum, yttrium. |
Artifacts | Unwanted marks or images on the radiograph. |
Spectral sensitivity | The portion of the electromagnetic spectrum to which the film is most sensitive. |
Sensitometric curve | An S shaped curve demonstrating the response of a film to a full range of exposure. |
D-Max | The maximum density on a sensitometric curve. |
Optical density (OD) | A numerical representation of the films ability to transmit light. |
Base+Fog Density | The measure of light absorbed by the film base plus any fog exposure to the film before processing. |
Latitude | The term used to describe the range of densities that can be recorded on an x-ray film. |
Straight-line portion | The portion of the graph that is in a relatively straight, vertical position and indicates film speed. |
Spectral emission | The color of light emitted by a phosphor. |
Silver halide | Silver salts of the halogen elements that are mixed with gelatin to form the film emulsion. |