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a disturbance in a recorded radiographic image.
grid mottle in radiology, a widening of grid lines when the grid is in motion.
quantum mottle variations in optical density on a radiograph.
mottle caused by the statistical fluctuation of the number of photons absorbed by the intensifying screens to form the light image on the film; faster screens produce more quantum mottle.
In radiography, a speckled, snowy-looking, nonuniform mottle caused by an insufficient number of x-ray photons striking the radiographic image receptor during an exposure. The mottle is corrected by increasing milliampere seconds.
See also: mottle