quantum mottle

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

quan·tum mot·tle

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.
Farlex Partner Medical Dictionary © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners
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