Modeling of Nonlinear Propagation in Multi-layer Biological Tissues for Strong Focused Ultrasound  

作　　者：范庭波 刘振波 张喆 章东 龚秀芬 

机构地区：[1]Institute of Acoustics, Key Laboratory of Modern Acoustics (Ministry of Education), Nanjing University, Nanjing 210093

出　　处：《Chinese Physics Letters》2009年第8期171-174,共4页中国物理快报（英文版）

基　　金：Supported by the Program for New Century Excellent Talents in University （06-0450）, the National Natural Science Foundation of China under Grant No 10774071, and the Natural Science Foundation of Jiangsu Province （BK2007518）.

摘　　要：A theoretical model of the nonlinear propagation in multi-layered tissues for strong focused ultrasound is proposed. In this model, the spheroidal beam equation （SBE） is utilized to describe the nonlinear sound propagation in each layer tissue, and generalized oblique incidence theory is used to deal with the sound transmission between two layer tissues. Computer simulation is performed on a fat-muscle-liver tissue model under the irradiation of a 1 MHz focused transducer with a large aperture angle of 35°. The results demonstrate that the tissue layer would change the amplitude of sound pressure at the focal region and cause the increase of side petals.A theoretical model of the nonlinear propagation in multi-layered tissues for strong focused ultrasound is proposed. In this model, the spheroidal beam equation （SBE） is utilized to describe the nonlinear sound propagation in each layer tissue, and generalized oblique incidence theory is used to deal with the sound transmission between two layer tissues. Computer simulation is performed on a fat-muscle-liver tissue model under the irradiation of a 1 MHz focused transducer with a large aperture angle of 35°. The results demonstrate that the tissue layer would change the amplitude of sound pressure at the focal region and cause the increase of side petals.

关 键 词：sea surface nonliear interaction numerical method 

分 类 号：P433[天文地球—大气科学及气象学] TB552[理学—物理]