非线性声参量阵成像系统设计

非线性声参量B/A描述了有限振幅声波在媒质中传播的非线性特性，该参量用于生物组织成像，有可能成为生物组织定征的新参量。声参量阵效应是声波传播过程中的一种非线性效应，参量B/A的大小决定了参量阵非线性的大小，利用声传播参量阵效应建立了一套非线性参量B/A成像系统，对动物组织进行成像。着重介绍硬件成像系统的建立，以及系统中提高信噪比、抗干扰等所采取的措施。用该系统对样品所成的像效果良好。
  Design of System of Acoustic Nonlinear Parameter Tomography
Fan Bin1,Zhang Dong2,Yan Yongsheng2,Wang Huanlei2,Gong Xiufen2
(1.University of Science and Technology of Suzhou, Suzhou 215009；2.Institute of Acoustics,Nanjing University,Nanjing 210093)
Abstract：The acoustic nonlinear parameter B/A describes the features of the propagation of the finite amplitude sound wave .It is used in tomography of biological tissues and may be a new parameter for the ultrasound tissue characterization.The acoustic parametric array is a kind of nonlinear interaction and it depends on the parameter B/A.This nonlinear interaction is used to set up a system of nonlinearity parameter B/A tomography of biological tissues.Introduce some methods for seting up system and raising signal-to-noise ratio.The image of biological tissues gaining by this sytem is well.
Key Words：Acoustic Nonlinear Parameter;Signal-to-noise Ratio;System of Tomography