摘要
非线性声参量Ｂ／Ａ是生物组织超声辨认的一个重要的新参量．本文从Ｂｕｒｇｅｒｓ’方程出发分析了有限振幅平面声波在层状介质中的非线性传播理论，并将它用于二次谐波的声成像，利用通常的ＣＴ算法而得的二次谐波数据进行了非线性声参量的计算机模拟成像，用滤波逆投影算法进行图像重建，对简单的样品模型得到了较好的非线性声参量断层图像．
Acoustic nonlinearity parameter B/A is a new important parameter in ultrasonictissue characterization. In this paper we present the nonlinear theory of a finite amplitudeplane sound wave propagating in layer medium by Burgers' equation and extend this analysisto the case of imaging with the second harmonic wave. A computer simulation of acousticnonlihear parameter imaging was carried out from the second harmonic data in a conventionalCT algorithm. The reconstructed images are obtained by using filtered backprojectionalgorithm. The tomography of acoustic nonlinear parameter for simple phantomsisreconstructed with quite good quality.
出处
《声学学报》
EI
CSCD
北大核心
1994年第2期140-146,共7页
Acta Acustica
基金
国家自然科学基金
关键词
非线性声参量
计算机模拟
声成象
Acoustic wave effects
Computer simulation
Harmonic analysis
Second harmonic generation
