Title: Analysis of bubble cavitation in ultrasound therapy by wavelet technique
Author: Yufeng Zhou
Address: Division of Gastroenterology, Department of Medicine, University of Washington, Seattle, WA, 98195, USA
Abstract: Bubble cavitation is one of the major mechanisms for ultrasound treatment. To understand its characteristics, cavitation signals were picked up using passive cavitation detection and then analysed by wavelet transform. Although the Fast Fourier Transform (FFT) has been used widely in signal analysis, the absence of temporal information is one of its limitations. The inertial cavitation strength detected by wavelet method was ∼60 folds higher than that using FFT. Furthermore, the relationship of waveform profile and acoustic pressure with the corresponding bubble cavitation were investigated. All together, wavelet approach could be new tool for studying bubble cavitation.
Keywords: bubble cavitation; PCD; passive cavitation detection; wavelet transforms; ultrasound therapy; waveform profile; acoustic pressure.
Int. J. of Functional Informatics and Personalised Medicine, 2008 Vol.1, No.4, pp.378 - 389
Available online: 21 Dec 2008