Influence of the abdominal wall on the nonlinear propagation of focused therapeutic ultrasound  

作　　者：刘振波 范庭波 章东 龚秀芬 

机构地区：[1]Institute of Acoustics,Key Lab of Modern Acoustics,Nanjing University [2]Nanjing Normal University

出　　处：《Chinese Physics B》2009年第11期4932-4937,共6页中国物理B（英文版）

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

摘　　要：This article theoretically studies the influence of inhomogeneous abdominal walls on focused therapeutic ultrasound based on the phase screen model. An inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Variations of acoustic parameters such as peak positive pressure, peak negative pressure, and acoustic intensity are discussed with respect to the phase screen statistics of human abdominal walls. Results indicate that the abdominal wall can result in energy loss of the sound in the focal plane. For a typical human abdominal wall with correlation length of 7.9 mm and variance of 0.36, the peak acoustic intensity radiated from a 1MHz transmitter with a radius of 30 mm can be reduced by about 14% at the focal plane.This article theoretically studies the influence of inhomogeneous abdominal walls on focused therapeutic ultrasound based on the phase screen model. An inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Variations of acoustic parameters such as peak positive pressure, peak negative pressure, and acoustic intensity are discussed with respect to the phase screen statistics of human abdominal walls. Results indicate that the abdominal wall can result in energy loss of the sound in the focal plane. For a typical human abdominal wall with correlation length of 7.9 mm and variance of 0.36, the peak acoustic intensity radiated from a 1MHz transmitter with a radius of 30 mm can be reduced by about 14% at the focal plane.

关 键 词：phase aberration focused therapeutic ultrasound abdominal wall 

分 类 号：R310[医药卫生—基础医学] O426.9[理学—声学]