Ring down artifact
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At the time the article was created Matt A. Morgan had no recorded disclosures.View Matt A. Morgan's current disclosures
At the time the article was last revised Sonam Vadera had no recorded disclosures.View Sonam Vadera's current disclosures
The artifact is only associated with gas bubbles, and occurs when an ultrasound pulse encounters a "horn" or "bugle" shaped fluid collection that is trapped between an inverted tetrahedron of 4 bubbles (3 on top and 1 nestled deep to them). The trapped fluid resonates, emitting a continuous signal back to the transducer. Whereas the transducer pulse is broad spectrum, the returning signal consists of one or more discrete (resonant) frequencies. "Beats" between these frequencies produce the variable appearance of the ring down. There is no "reverberation" ( i.e. multiple reflectances).
This artifact can be eliminated by angling the ultrasound probe.
- 1. Avruch L, Cooperberg PL. The ring-down artifact. J Ultrasound Med. 1985;4 (1): 21-8. Pubmed citation