Effects of lamb wave in therapeutic ultrasound transducer by vibration analysis

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

研究成果: Conference contribution

抄録

A typical single-element High Intensity Focused Ultrasound (HIFU) transducer has a spherical shell in order to focus the acoustic energy onto the focal spot. In a prototype PZT transducer we constructed, a mode of plate wave propagation in the shell was experimentally observed in addition to the uniform thickness vibration mode. Such an unwanted wave component may deform the ultrasonic power deposition pattern, which can potentially influence the therapeutic effects. In this study, we analyzed the vibrating behavior of a spherical piezoelectric transducer in two ways: by the reconstruction of the sound source distribution from a measured pressure field and by a numerical simulation of vibration based on a Finite Element Method (FEM). In the two-dimensional Fourier analysis performed in both time and space domain, the radial wavenumber spectrum showed a high peak, second to the highest peak corresponding to the uniform vibration. This corresponds to the waves propagating from the circumference towards the center of the spherical transducer like a symmetric mode of leaky Lamb waves. The leaked waves propagate at a constant angle with the shell surface in water and form a relatively large lobe on the axis at the nearside of the geometric focus. This nearside lobe, also observed in the measurement, may cause additional near field heating of tissues.

本文言語English
ホスト出版物のタイトル6th World Congress of Biomechanics, WCB 2010 - In Conjunction with 14th International Conference on Biomedical Engineering, ICBME and 5th Asia Pacific Conference on Biomechanics, APBiomech
ページ1640-1643
ページ数4
DOI
出版ステータスPublished - 2010 10 22
イベント6th World Congress of Biomechanics, WCB 2010 - In Conjunction with 14th International Conference on Biomedical Engineering, ICBME and 5th Asia Pacific Conference on Biomechanics, APBiomech - Singapore, Singapore
継続期間: 2010 8 12010 8 6

出版物シリーズ

名前IFMBE Proceedings
31 IFMBE
ISSN(印刷版)1680-0737

Other

Other6th World Congress of Biomechanics, WCB 2010 - In Conjunction with 14th International Conference on Biomedical Engineering, ICBME and 5th Asia Pacific Conference on Biomechanics, APBiomech
CountrySingapore
CitySingapore
Period10/8/110/8/6

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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