Effects of Lamb waves in a single-element High Intensity Focused Ultrasound transducer

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

研究成果: Conference contribution

抄録

In a spherical single-element piezoceramic transducer for HIFU (High Intensity Focused Ultrasound) treatment, the modes of plate wave propagation within the ceramic were observed in addition to the pure thickness-mode vibration in experiment. These may potentially influence the therapeutic effects. In this study, we analyzed the vibrational behavior of an air-backed single-element spherical PZT transducer in two ways: by reconstruction of the sound source distribution from the measured ultrasound pressure field, and by numerical simulation of vibration based on a Finite Element Method (FEM). In the two-dimensional Fourier analysis performed in the time and space domains, the radial wavenumber spectrum at the driving frequency showed a high peak, second to the highest peak corresponding to the uniform vibration. This corresponds to waves propagating as leaky Lamb waves from the circumferential edge towards the center of the spherical transducer. These waves propagate at a constant angle with the shell surface in water, and form the relatively large lobes on the acoustic axis on the nearside of the geometric focus. The acoustic energy of the nearside lobes may cause additional near-field heating of tissues which should not to be treated.

本文言語English
ホスト出版物のタイトル10th International Symposium on Therapeutic Ultrasound, ISTU 2010
ページ211-214
ページ数4
DOI
出版ステータスPublished - 2011 10 13
イベント10th International Symposium on Therapeutic Ultrasound, ISTU 2010 - Tokyo, Japan
継続期間: 2010 6 92010 6 12

出版物シリーズ

名前AIP Conference Proceedings
1359
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

Other10th International Symposium on Therapeutic Ultrasound, ISTU 2010
国/地域Japan
CityTokyo
Period10/6/910/6/12

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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