基于相对PMUT线阵的乳腺超声断层重建算法研究  

Research on Ultrasound Tomography Reconstruction Algorithm with Two Opposite PMUT Linear Arrays

作　　者：刘畅 程义军[1] 薛晨阳[2] 张斌珍[2] LIU Chang;CHENG Yijun;XUE Chenyang;ZHANG Binzhen(Department of Electronic Engineering,Taiyuan Institute of Technology,Taiyuan Shanxi 030008,China;Key Laboratory of Instrumentation Science&Dynamic Measurement(North University of China),Ministry of Education,Taiyuan Shanxi 030051,China)

机构地区：[1]太原工业学院电子工程系,山西太原030008 [2]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《传感技术学报》2020年第10期1432-1437,共6页Chinese Journal of Sensors and Actuators

基　　金：国家重点研发项目(2016YFC0101900,2016YFC0105004)。

摘　　要：依据已设计的乳腺超声CT系统中超声换能器配置方案的特征,提出了一种基于相对压电微机械超声换能器(PMUT)线阵的乳腺超声断层重建算法。以等距扇形束为基础,制定空间复合重建测试方案,在此基础上,详细推导沿直线轨迹运动的重建算法公式。利用MATLAB建立数值乳腺模型,并对不同重建方案下的图像进行仿真及量化分析。结果表明,将B型超声图像作为先验信息的图像融合测试方案下的重建图像,能够较好的重建脂肪、腺体、肿块、纤维瘤、癌症和钙化点等组织类型的数量、位置、大小和形态,在ROI区域内的PSNR为144.89,RMSE为0.0608。有效地改善了在有限角度下超声断层成像受到沿深度方向的伪像困扰,提高了图像重建性能。According to the characteristics of ultrasound transducer configuration in breast ultrasound CT system,an algorithm of breast ultrasound tomography reconstruction based on opposite Piezoelectric Micromachined Ultrasonic Transducer(PMUT)linear array was proposed.Based on the isometric sector beam,a space compound reconstruction test scheme is developed.On this basis,the reconstruction algorithm formula of the motion along the linear trajectory is derived in detail.MATLAB was used to establish a numerical breast model,and the images under different reconstruction schemes were simulated and quantitatively analyzed.The results showed that the reconstructed image under the image fusion test scheme with B-mode ultrasound image as the prior information could better reconstruct the number,location,size and shape of tissue types such as fat,gland,mass,fibroma,cancer and calcification,with a PSNR and RMSE of 144.89 and 0.0608 in the ROI region.This method can effectively improve the image reconstruction performance of the ultrasound tomography in limited angle.

关 键 词：超声断层成像算法 PMUT线阵 直线轨迹 感兴趣区域 有限角度 

分 类 号：TB552[理学—物理]