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Analysis of acoustic impedance matching in dual-band ultrasound transducers

Analysis of acoustic impedance matching in dual-band ultrasound transducers

Category
Journal publication
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.
Client
  • Norges forskningsråd / 256290
  • Samarbeidsorganet mellom Helse Midt-Norge og NTNU / 46056805
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • St. Olavs Hospital, Trondheim University Hospital
  • SINTEF Digital / Connectivity Technologies and Platforms
Year
2017
Published in
Journal of the Acoustical Society of America
ISSN
0001-4966
Volume
141
Issue
2
Page(s)
1170 - 1179