人体组织相位畸变模型仿真研究  

Simulations of phase aberration models in human tissues

作　　者：夏新源 李平[1] 孟晓辉[1] 理华[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《应用声学》2016年第4期334-342,共9页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11204346)

摘　　要：为研究医学超声成像中的相位畸变模型,通过Westervelt方程的时域有限差分方法,仿真比较了近场相位屏模型、全局声速误差模型以及分层介质模型在聚焦发射过程和回波信号接收过程的特点,并参考理想均匀介质与人体非均匀介质的结果,发现几种相位畸变模型都难以准确模拟人体腹壁对发射声场的影响,同时近场相位屏模型相对其他两种模型虽然能够较好地描述出非均匀组织的相位畸变特点,但无法表现出全局声速误差模型及分层介质模型中相位误差跟随目标方位变化的关系。In order to have a close study in phase aberration models of medical ultrasound imaging, a series of comparative simulations of sound field in transmission and received signal in reception were conducted through Westervelt equation solved by finite difference in time domain. The results of the ideal homogeneous media and human abdominal tissues were used as the reference for the three different phase aberration models including near-field screen model, gross velocity error model and multi-layer model, which pointed out that near-field screen model outperformed in description for misalignment of human tissues but failed to reflect the connections between phase errors and the location of the target.

关 键 词：医学超声成像 相位畸变模型 时域有限差分 

分 类 号：R455.1[医药卫生—运动医学]