Chirp编码激励用于高频医学超声系统的实验及性能评价  

Experiments and Performance Evaluation of the Chirp Coded Excitation for High-Frequency Medical Ultrasound Systems

作　　者：张耀楠[1,2] 付强[2] 唐亮[1] ZHANG Yaonan;FU Qiang;TANG Liang(College of Electronics and Information Engineering, Siyuan University, Xi’an Shaanxi 710038, China;School of Sino-Dutch Biomedical and Information Engineering, Northeastern University, Shenyang Liaoning 110169, China)

机构地区：[1]西安思源学院电子信息工程学院,陕西西安710038 [2]东北大学中荷生物医学与信息工程学院,辽宁沈阳110169

出　　处：《中国医疗设备》2018年第1期34-38,56,共6页China Medical Devices

基　　金：陕西省自然科学基础研究计划(2017JM8085);西安思源学院校级重大科研项目(XASY-B1601)

摘　　要：针对编码激励技术的各种激励模式在高频超声成像系统中的性能评价问题,本文设计了一个可以进行编码/脉冲激励的实验系统并基于其进行了一系列实验。该实验系统由FPGA芯片XC7K325T、激励模块、AD7982、T/R开关、探头、二维控制平台、软件部分等组成,以N7系统TR电路板为核心进行构建。在实验中对比在编码激励方式与传统脉冲激励方式下,高频超声成像系统的分辨率、探测深度、信噪比,帧速率等一系列重要参数,然后将高频超声编码成像系统进一步应用于线模、体模等仿体以及离体组织的成像,进一步与传统激励模式相对比,获得在实际应用场景下编码激励方式与传统激励方式优劣势的对比。实验结果表明,Chirp激励模式的确可以对高频超声的穿透深度、横向分辨率、CNR等成像参数进行优化,但是会牺牲一定的轴向分辨率。Aiming at the performance evaluation problem of various excitation modes of coding excitation technology used in high frequency ultrasound imaging system,this paper designed an experimental system which could carry out coding and pulse excitation and conducted a series of experiments based on it.The experimental system was composed of FPGA chip XC7K325T,excitation module,AD7982,T/R switch,probe,two-dimensional control platform,software components,and so on,which was based on the TR circuit board of Neusoft medical N7system.In the experiments,comparing with the traditional excitation mode,the resolution,the detection depth,the signal to noise ratio and the frame rate of the high frequency ultrasound imaging system were discussed.The high frequency ultrasound imaging system was further applied to the imaging of the various phantoms.The advantages and disadvantages of the coded excitation mode were obtained in the practical application in comparison with traditional mode.The experimental results showed that the chirp mode could be used to optimize the penetration depth,lateral resolution,CNR and other imaging parameters of high frequency ultrasound with some sacrifices in axial resolution.

关 键 词：医学超声 编码激励技术 高频超声成像 分辨率 信噪比 

分 类 号：R445.1[医药卫生—影像医学与核医学]