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Journal of Ultrasound in Medicine, Vol 4, Issue 1 21-28, Copyright © 1985 by American Institute of Ultrasound in Medicine
The ring-down artifact
L. Avruch and P. L. Cooperberg
"Ring-down" is an ultrasound artifact that appears as a solid streak or a
series of parallel bands radiating away from abdominal gas collections.
Using an in vitro system of bubbles in water or gelatin, it was found that
the ring-down artifact originated from the center of a cluster of four
bubbles (bubble tetrahedron), three on top and one nestled beneath.
Entrapped between the bubbles is a horn- or bugle-shaped fluid collection
that we theorize emits a continuous sound wave back to the transducer when
struck by an ultrasound pulse. Electronic processing by the scanner
converts this continuous sound wave into the series of bands seen in the
ring-down artifact.
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