TY - GEN
T1 - Effects of leaky Lamb-like wave propagation in single-element highintensity focused ultrasound transducer by vibration analysis
AU - Otsu, Kenji
AU - Kaneshima, Yasuhiro
AU - Umemura, Shin Ichiro
AU - Komura, Yuji
AU - Yoshizawa, Shin
PY - 2010/12/1
Y1 - 2010/12/1
N2 - 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.
AB - 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.
KW - High Intensity Focused Ultrasound
KW - Lamb wave
KW - PZT
KW - acoustic field
KW - transducer
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U2 - 10.1109/ULTSYM.2010.5935572
DO - 10.1109/ULTSYM.2010.5935572
M3 - Conference contribution
AN - SCOPUS:80054055911
SN - 9781457703829
T3 - Proceedings - IEEE Ultrasonics Symposium
SP - 1230
EP - 1233
BT - 2010 IEEE International Ultrasonics Symposium, IUS 2010
T2 - 2010 IEEE International Ultrasonics Symposium, IUS 2010
Y2 - 11 October 2010 through 14 October 2010
ER -