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Radiology, Vol 177, 153-156, Copyright © 1990 by Radiological Society of North America

ARTICLES

Comet-tail artifact from cholesterol crystals: observations in the postlithotripsy gallbladder and an in vitro model

RS Shapiro and F Winsberg
Department of Radiology, Mount Sinai School of Medicine, City University of New York 10029-6574.

The "comet tail" is a well-known ultrasound artifact that appears as a series of parallel bands radiating from a source. This artifact was observed in the gallbladder lumen in eight of 10 patients after extracorporeal shock wave lithotripsy of radiolucent calculi. To investigate the cause of the comet tail artifact, cholesterol crystals were studied in an in vitro model. The comet-tail appearance was reproduced in vitro and was found to be directly related to the interrogating frequency and the size of the crystal aggregates. The authors conclude that cholesterol crystals can serve as the source of the comet-tail artifact secondary to reverberation within the crystals.


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