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Twinkling Artifact 2 tiny stones were detected by color Doppler twinkling artefact which they were otherwise unrecognizable on grey scale images. Small renal stones (less than 4 mm) may go undetected at routine ultrasonography due to lack of acoustic shadowing. However, twinkling artefact is a very useful color Doppler artefact that may assist in detecting renal stones as small as 1-2 mm. The twinkling artefact is a random strong reflection of the incident ultrasound beam at a rough surface formed by mater
