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Analysis of acoustic impedance matching in dual-band ultrasound transducers

Myhre, Ola Finneng; Johansen, Tonni Franke; Angelsen, Bjørn Atle J.
Journal article, Peer reviewed
Published version
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URI
http://hdl.handle.net/11250/2461992
Date
2017
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  • Institutt for sirkulasjon og bildediagnostikk [1382]
  • Publikasjoner fra CRIStin - NTNU [26593]
Original version
Journal of the Acoustical Society of America. 2017, 141 (2), 1170-1179.   10.1121/1.4976096
Abstract
Dual-frequency band probes are needed for ultrasound (US) reverberation suppression and are useful for image-guided US therapy. A challenge is to design transducer stacks that achieve high bandwidth and efficiency at both operating frequencies when the frequencies are widely separated with a frequency ratio ∼6:1–20:1. This paper studies the loading and backing conditions of transducers in such stacks. Three stack configurations are presented and analyzed using one-dimensional models. It is shown that a configuration with three layers of material separating the transducers is favorable, as it reduces high frequency ringing by ∼20 dB compared to other designs, and matches the low frequency (LF) transducer to the load at a lower frequency. In some cases, the LF load matching is governed by a simple mass–spring interaction in spite of having a complicated matching structure. The proposed design should yield improved performance of reverberation suppression algorithms. Its suitability for reduction of probe heating, also in single-band probes, should be investigated.
Publisher
Acoustical Society of America
Journal
Journal of the Acoustical Society of America

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