Effects of leaky Lamb-like wave propagation in single-element highintensity focused ultrasound transducer by vibration analysis

Kenji Otsu, Yasuhiro Kaneshima, Shin Ichiro Umemura, Yuji Komura, Shin Yoshizawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In a spherical piezoceramic transducer for HIFU (High Intensity FocusedUltrasound) treatment, a mode of plate wave propagation within the ceramic wereexperimentally observed in addition to the pure thickness-mode vibration. Inthis study, we experimentally and numerically analyzed the vibration behavior ofan air-backed single-element spherical PZT transducer. The acoustic pressuredistribution on the ceramic surface was obtained in the experimental analysisusing time reversal, and the numerical analysis was performed using FEM. In thetwo-dimensional Fourier analysis, the radial wavenumber spectrum showed asecondary peak, corresponding to a leaky Lamb-like mode. The leaked waves mayhave propagated into water and formed the relatively large lobes on thepropagation axis. These unwanted nearside lobes may potentially cause additionalnear-field heating of the tissues which should not be treated.

Original languageEnglish
Title of host publication2010 IEEE International Ultrasonics Symposium, IUS 2010
Pages1230-1233
Number of pages4
DOIs
Publication statusPublished - 2010 Dec 1
Event2010 IEEE International Ultrasonics Symposium, IUS 2010 - San Diego, CA, United States
Duration: 2010 Oct 112010 Oct 14

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117

Other

Other2010 IEEE International Ultrasonics Symposium, IUS 2010
CountryUnited States
CitySan Diego, CA
Period10/10/1110/10/14

Keywords

  • High Intensity Focused Ultrasound
  • Lamb wave
  • PZT
  • acoustic field
  • transducer

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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