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24 Cards in this Set
- Front
- Back
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radiographic quality
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the ease with which details can be perceived on a radiograph
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radiographic density
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the degree of blackness or "darkness" on a radiograph
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radiographic contrast
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the density difference between two adjacent areas on a radiograph
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subject contrast
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the difference in density and mass of two adjacent anatomic structures
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scatter radiation
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non-image0forming radiation that is scattered in all directions because of objects in the path of the x-ray beam
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backscatter
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process of scattering or reflecting radiation in the opposite direction from that intended. radiation that is reflected from behind the image plane back to the image
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grid
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a device made of lead strips embedded in a spacing material, placed between the patience and the film, designed to absorb non-image-forming radiation
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grid focus
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the distance between the source of x-rays and the grid in which the grid is effective without grid cutoff
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grid cutoff
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a progressive decrease in transmitted x-ray intensity caused by absorption of primary x-rays by the grid lines
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grid efficiency
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the ability of a grid to absorb non-image-forming radiation in the production of a quality radiograph
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grid ratio
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the relation of the height of the lead strips to the distance between them
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lines per centimeter
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the number of lead strips per centimeter area of a grid
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grid factor
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the amount of exposure needs to be increased to compensate for the grid's absorption of a portion of the primary beam
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linear grid
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grid in which the lead strips are parallel
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crossed grid
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two parallel or two focused grids that are set at right angles
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focused grid
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a grin with a parallel center lead strip and inclined strips on either side that radiate at progressively greater angles
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unfocused grid
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a grid with lead strips that are parallel and at right angles to the film
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pseudofocused grid
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a grid with parallel lead strips that are progressively reduced in height toward the edges of the grid
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Potter-Bucky diaphragm
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a mechanical device that consists of a focused grid within a diaphragm, which moves the grid across the x-ray beam during the exposure
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geometric unsharpness
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loss of detail due to geometric distortion
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geometric distortion
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variation in normal size and shape of anatomic structures due to their position in relation to the x-ray source and film
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magnification
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distortion of anatomic structures when the image appears larger than actual size
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elongation
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distortion of anatomic structures so that the image appears longer than actual size, owing to the x-ray beam not being directed perpendicular to the film surface
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foreshortening
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distortion of anatomic structures when the image appears shorter than actual size due to the plane of interest not being parallel to the film surface
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