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Proceedings Paper

Modeling refraction and attenuation effects in invasive ultrasound probes
Author(s): Joe F. Guess
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Paper Abstract

With the current clinical interest in invasive probes, small size has become paramount in many applications. When a mechanically steered probe is reduced in size, the exit window becomes tightly curved around the transducer. Angles of incidence upon that window increase, differences in sound speed at interfaces are more significant, and refraction increases. The incident angles may approach critical angles. How much does this hurt performance? A ray tracing technique of predicting field behavior is used to analyze the performance of annular array transesophageal probes, as an example. The properties of several different candidate polymers and fluids properties were determined at 37 degree(s)C. Probe performance was calculated when these comprised the fluid and exit window. With sound speed differences of 20%, degradation of resolution is significant, but subtle. Electronic focusing has to be chosen to produce optimum resolution.

Paper Details

Date Published: 5 November 1992
PDF: 9 pages
Proc. SPIE 1733, New Developments in Ultrasonic Transducers and Transducer Systems, (5 November 1992); doi: 10.1117/12.130596
Show Author Affiliations
Joe F. Guess, Sonovolt (United States)


Published in SPIE Proceedings Vol. 1733:
New Developments in Ultrasonic Transducers and Transducer Systems
Frederick L. Lizzi, Editor(s)

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