Colour comet-tail artefact
The colour comet-tail artefact is an ultrasonographic sign seen in a number of situations, when colour Doppler scanning is performed.
Typically the artefact, which resembles the grey-scale comet-tail artefact, is seen in situation when a small highly refractive (usually calcific) object is interrogated with colour Doppler. Twinkle artefact occurs and immediately deep to the object a tail linear aliased band of colour extends away from the probe.
The following are situations in which this sign may be present and helpful: