Term
| what are the 3 types of image receptors |
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Definition
| film-screen, photosensitive phosphor plate, or a charged electronic device |
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Term
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Definition
| when x-rays pass through body and hit psp plate, some giving off light and some giving off a latent image |
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Term
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Definition
| x-rays create a latent image in the form of an electrical signal that is not visible to the human eye |
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Term
| what is a radiographic film composed of? |
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Definition
| emulsion spread on a thin transparent sheet of polyester plastic |
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Term
| what forms the emulsion on a film |
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Definition
| microscopic bromide crystals in a gelatin suspension |
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Term
| percentage of image produced from x-rays versus light from cyrstals |
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Definition
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Term
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Definition
| process in a chemical solution (developer) to create a visible image |
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Term
| how a CR image is captured |
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Definition
| when x-rays strike the psp plate electrons are trapped in a high energy state then scanned by laser and digitized |
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Term
| advantages of digital radiography |
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Definition
| no wet processing=faster, range of techniques=less exposure+less retakes |
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Term
| reduction of fog in digital radiography |
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Definition
| is minimized and creates an image with more contrast and higher quality |
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Term
| what are the 3 types of control a typical radiographic machine has |
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Definition
| time, voltage, and amperage |
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Term
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Definition
| the force or penetrating ability of the radiation |
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Term
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Definition
| the amount of radiation per unit time |
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Term
| what are the 4 radiographic densities of the human body? |
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Definition
| gas/air, fat, muscle, bone |
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Term
| in what ways does metal show up on an image |
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Definition
| foreign bodies, prostheses, and contrast media |
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Term
| what are cones and collimators |
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Definition
| beam limiting devices that reduce exposure field size and scatter |
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Term
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Definition
| the variation in densities |
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Term
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Definition
| the variation in densities in the human anatomy |
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Term
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Definition
| any medium that has a different that has a different radiation absorbing potential then the body |
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Term
| the grid will decrease density and the amount of radiation because |
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Definition
| the grid absorbs up to 90% of scatter and remnant radiation |
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Term
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Definition
| false representation of the true shape of the object |
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Term
| what 2 factors contribute to magnification and distortion |
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Definition
| object to image distance and source to image receptor distance |
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Term
| magnification can be reduced by: |
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Definition
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Term
| what is radiographic detail? |
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Definition
| the distinctness with which images of structures are recorded for viewing |
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Term
| what is the most important quality of an image? |
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Definition
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Term
| factor that most frequently occurs that affects detail negatively |
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Definition
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Term
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Definition
| the spot or source from which the x-rays originate (the smaller the spot, the sharper the lines) |
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Term
| as distance from the focus to the object/patient decreases. . . |
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Definition
| a loss of detail occurs (magnification) |
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