Colour comet-tail artifact
The colour comet-tail artifact is an ultrasonographic sign seen in a number of situations when colour Doppler scanning is performed.
Typically the artifact, which resembles the grey-scale comet-tail artifact, is seen in a situation when a small highly refractive (usually calcific) object is interrogated with colour Doppler. Twinkle artifact 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: