The simulated sound field of an annular ultrasound transducer is given based on Fourier-Bessel series method. After analyzing the axial acoustic pressure, especially the near-field disturbance, wavelet multi-resolution analysis of the noise reduction is carried out for removing the near-field complex frequency components and increasing the sound pressure amplitude. The results show that the wavelet analysis technique can be used for improving the fundamental ultrasound imaging quality of Bessel field.
LI Qin
,
TAN Guan-Zheng
. Bessel field pre-treatment based on wavelet analysis[J]. Journal of University of Chinese Academy of Sciences, 2012
, 29(4)
: 524
-528
.
DOI: 10.7523/j.issn.2095-6134.2012.4.014
[1] Durnin J. Exact soulutions for nondiffracting beam. I. The scalar theory[J]. Journal of the Optical Society of America A, 1987, 4(4):651-654.
[2] Jian Y L, Greenleaf J F. Ultrasonic nondiffracting transducer for medical imaging[J]. IEEE Transactions on Ultrasonics,Ferroelectrics and Frequency Control, 1990, 37(5):438-447.
[3] Fox P D, Cheng J Q, Lu J Y. Fourier-Bessel field calculation and tuning of a CW annular array[J]. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2002, 49(9):1179-1190.
[4] Du H W, Peng H, Jiang Z H, et al. Simulation study on the second harmonic ultrasound field of a Bessel beam[J]. Journal of Harbin Institute of Technology, 2009, 41(3):108-112. 杜宏伟,彭虎,江朝晖. Bessel波二次谐波声场的仿真研究[J]. 哈尔滨工业大学学报,2009,41(3):108-112.
[5] Zhong J M, Sun H F. Wavelet-based multiscale anisotropic diffusion with adaptive statistical analysis for image restoration[J]. IEEE Transactions on Circuits and Systems I, 2008, 55(9):2716-2725.
[6] Tang Q X, Jiao L C. Image denoising with geometrical thresholds[J]. Electronics Letters, 2009, 45 (8):405-406.
[7] Wang P, Guo C S, Tao C B, et al. A filtering algorithm of optimal threshold function based on spatial correlation and its virtual realization[J]. Journal of Tianjin University, 2009, 42(6):476-482(in Chinese). 王萍,郭翠双,陶陈彬,等. 基于空域相关的优化阈值函数滤波算法及其虚拟实现[J]. 天津大学学报,2009,42(6):476-482.
