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24 Cards in this Set

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radiographic quality
the ease with which details can be perceived on a radiograph
radiographic density
the degree of blackness or "darkness" on a radiograph
radiographic contrast
the density difference between two adjacent areas on a radiograph
subject contrast
the difference in density and mass of two adjacent anatomic structures
scatter radiation
non-image0forming radiation that is scattered in all directions because of objects in the path of the x-ray beam
backscatter
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
grid
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
grid focus
the distance between the source of x-rays and the grid in which the grid is effective without grid cutoff
grid cutoff
a progressive decrease in transmitted x-ray intensity caused by absorption of primary x-rays by the grid lines
grid efficiency
the ability of a grid to absorb non-image-forming radiation in the production of a quality radiograph
grid ratio
the relation of the height of the lead strips to the distance between them
lines per centimeter
the number of lead strips per centimeter area of a grid
grid factor
the amount of exposure needs to be increased to compensate for the grid's absorption of a portion of the primary beam
linear grid
grid in which the lead strips are parallel
crossed grid
two parallel or two focused grids that are set at right angles
focused grid
a grin with a parallel center lead strip and inclined strips on either side that radiate at progressively greater angles
unfocused grid
a grid with lead strips that are parallel and at right angles to the film
pseudofocused grid
a grid with parallel lead strips that are progressively reduced in height toward the edges of the grid
Potter-Bucky diaphragm
a mechanical device that consists of a focused grid within a diaphragm, which moves the grid across the x-ray beam during the exposure
geometric unsharpness
loss of detail due to geometric distortion
geometric distortion
variation in normal size and shape of anatomic structures due to their position in relation to the x-ray source and film
magnification
distortion of anatomic structures when the image appears larger than actual size
elongation
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
foreshortening
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