mottle

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mottle

 [mot´'l]
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.

mot·tle

(mot'tĕl),
Fine inhomogeneity of an area of generally uniform opacity on a photograph or radiograph; noise.
[fr. motley, fr. M.E. mot, speck]

mottle

Etymology: ME, motley, mixed colors
an effect observed in radiographic imaging when the dose of radiation used is reduced to a level at which individual quantum effects can be seen. At very low doses, the number of photons being produced is so small that the statistical variations in x-ray production can be visualized. Also called noise, quantum mottle.

mot·tle

(mot'tĕl)
Fine inhomogeneity of an area of generally uniform opacity on a photograph or radiograph; noise.
[fr. motley, fr. M.E. mot, speck]
References in periodicals archive ?
The position of this first restrictive layer coincides with the Btv4-horizon, which still has its original coarse (20-50 mm) platy structure, and a grey matrix with mostly red mottles, the mostly unaltered old `mottled zone' (for details see Brouwer and Fitzpatrick 2000, 2002 this issue).
Above this restrictive layer cutans have partially changed colour from black to reddish brown, and the mottles have changed from red to more yellow or brown (for details see Brouwer and Fitzpatrick 2000, 2002 this issue).
The correlation coefficients for linear regressions in Table 2 indicate that the Bt-horizon redness rating of Hurst (1977); the matrix + mottles, and matrix + mottles + clay films indices of Mokma and Cremeens (1991); and the chroma + hue index of Evans and Franzmeier (1988), are more or less equally useful for the prediction of the duration of waterlogging at the bottom of the E-horizon.