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14 Cards in this Set
- Front
- Back
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Radiograph is?
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an image produced on a specialty sensitized photographic film or plate by radiation, usually by X-rays or gamma rays.
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Radiology is?
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The production of radiographs of opaque objects for use in medicine, surgery, industry, etc.
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Radiology is?
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The use of x-rays and radioactive substances in diagnosis and treatment of disease
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What are the Exposure Factors that Control Density?
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Milliampere-seconds (Quantitiy)
Kilovoltage (Penetrating Power) Source Film distance (Inverse-square law) |
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What are the 3 inherent Film Qualities?
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Density, Detail, Contrast
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What is the minimum amount of kV to visually detect changes in density?
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5 kV
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What is the inverse square law?
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The intensity of radiation becomes weaker as it spreads out from the source since the same amount of radiation becomes spread over a larger area. The intensity is inversely proportional to the distance from the source.
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High Contrast
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Few shades of Gray (Short Scale)
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Low Contrast
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Many shades of gray (Long Scale)
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What is contrast?
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Differences in film density when a film is exposed to varying amounts of radiation.
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How many shades of gray?
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7
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What are the rules for Shadow casting?
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1. Source of radiation as small as possible
2. Source to object distance as long as practical 3. Object to film distance as short as possible 4. Object and film parallel 5. Source perpendicular to object and film. |
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Umbra
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The total shadow area.
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Penumbra
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The amount of unsharpness (Fuzziness at the edge of an image.
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