gray scale

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gray′ scale`

a scale of achromatic colors having equal gradations ranging from white to black.
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References in periodicals archive ?
In the light of the established ultrasound criteria, (1) normal (no presence of stenosis) was defined that internal carotid artery (ICA) peak systolic velocity (PSV) was less than 125 cm/s and no plaque or intimal thickening was visible; (2) <50% stenosis was defined that ICA PSV was less than 125 cm/s but plaque or intimal thickening was visible; and (3) ≥50% stenosis or occlusion was considered when ICA PSV was greater than 125 cm/s and plaque was visible, or there was no detectable patent lumen on gray-scale ultrasonography and no flow on spectral, power, and color Doppler ultrasonography.[10],[15],[16] Moreover, the higher value (left or right) was considered for analysis if bilateral stenosis was present.
Gray-scale ultrasonography in the evaluation of renal trauma.
Patient A: Real-time, gray-scale ultrasonography demonstrated testes that were symmetric in size and homogenous in echotexture.