二维超声应变重建的有限元仿真与组织实验  

A study on two-dimensional ultrasonic strain reconstruction using finite element analysis model and tissue experiment

作　　者：丁楚雄[1] 白净[1] 

机构地区：[1]北京清华大学电机系生物医学工程研究所,北京100084

出　　处：《声学学报》2002年第4期345-350,共6页Acta Acustica

基　　金：本文工作得到了国家自然科学基金资助

摘　　要：近几年来,利用超声散射回波测量生物组织弹性系数的超声应变成象方法得到了很大的发展。本文建立了基于有限元分析的二维软组织超声散射模型,并通过这一模型获得了组织在压缩前后的仿真超声散射回波。对模型组织超声散射回波的应变重建实验结果表明,组织在压缩过程中垂直于压缩方向的形变会引入重建应变误差,采用中心部位的扫描线,减小压缩比能减小该误差,提高应变图象的质量。组织实验的结果表明,有限元散射模型能模拟实际组织应变成象的情况,为组织实验提供参考。Elastography, which is a method for imaging the elastic behavior of soft tissues using ultrasonic echoes, has been under development recently. In this paper, a two-dimensional soft-tissue scattering simulation model based on Finite Element Analysis is established. Radio-frequency ultrasonic back-scattering signals from pre- and post- tissue compression models are obtained. The strain images are reconstructed by a cross-correlation based elastography procedure. The results show that the tissue lateral displacement introduce large errors into reconstructed strain. Use ultrasound beams which close the compression center, decrease the compression ratio can reduce this kind of errors. Experiment on soft tissue corroborates that the model presented in this article can be used to simulate elastographic experiment.

关 键 词：二维超声应变重建 有限元 仿真 组织实验 应变成象 疾病诊断 弹性系数 

分 类 号：O426[理学—声学]