环形阵列超声断层扫描高分辨率成像方法  

High resolution imaging methods for circular-array based ultrasound computed tomography

作　　者：李盼盼 李玉冰 苏畅[1,2] 武小晴 林伟军 LI Panpan;LI Yubing;SU Chang;WU Xiaoqing;LIN Weijun(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

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：《声学学报》2023年第1期182-192,共11页Acta Acustica

基　　金：中国科学院声学研究所自主部署“目标导向”类项目(MBDX202113)资助。

摘　　要：介绍了针对环形阵列超声断层扫描的高分辨率全波形反演成像方法,不同于传统的延时叠加和渡越时间断层扫描,该方法充分考虑声传播的透射、反射、散射等特点,通过数据匹配的方法重构目标体声学参数图像。开发了环形超声换能器阵列构建超声断层扫描成像系统,并设计了适合检验成像算法的数值和物理模型,分别使用基于射线理论的回波延时叠加和初至波渡越时间断层扫描、以及基于波动理论的全波形反演方法对目标体进行图像重建,并对比其原理、分辨率、计算量等方面的特点,系统性分析了波动方法相对传统射线方法的优点和不足。结果表明,全波形反演这类充分考虑接收信号多种物理特征的方法可用于较高分辨率的声参数成像,适合与传统方法结合设计有效的超声断层扫描成像系统。A full waveform inversion method is presented for ultrasound computed tomography imaging based on the circular array.Different from conventional ultrasound computed tomography methods,such as delay-and-sum and timeof-flight tomography,this method fully considers the sound propagation effects including transmitting,reflecting,and scattering.The acoustic parametric image of the target is reconstructed by fitting the synthetic and observed data.Based on the circular-array acquisition system,numerical and experimental tests are designed to evaluate algorithms,including ray-based(i.e.,delay-and-sum and time-of-flight tomography) and wave-equation based(i.e.,full waveform inversion)methods.Imaging results are compared to analyze the theoretical and practical aspects.The results of simulation and physical experiments show that full waveform inversion,which fully considers multiple physical characteristics of the received data,can reconstruct the parametric image at high resolution.Full waveform inversion can be combined with traditional methods to design an effective ultrasonic computed tomography imaging system.

关 键 词：高分辨率成像 图像重建 数据匹配 成像系统 渡越时间 断层扫描 射线理论 声学参数 

分 类 号：TB553[理学—物理]