合成孔径超声成像信号相位畸变的自适应校正技术研究

项目名称： 合成孔径超声成像信号相位畸变的自适应校正技术研究

项目编号： No.61471304

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 高晓蓉

作者单位： 西南交通大学

项目金额： 81万元

中文摘要： 超声合成孔径成像是结构材料无损检测的主要技术，进一步改善超声图像信噪比和分辨率，提高实时性，一直是该领域的重要课题。本项目拟通过理论分析、数值模拟和实验验证等手段，根据换能器相位延迟与成像波前的关系，采用自适应技术实时控制相位延迟，并通过成像目标函数判断校正的成像质量，达到校正波前畸变目的，从而实现高分辨成像。首先建立超声合成孔径成像理论模型，通过数值模拟，研究相位延迟与成像波前、成像分辨率之间的关系。其次，根据自适应校正技术原理，建立通过相位延迟控制成像波前的数值模型，并研究实现自适应校正的最优化方法，在此基础上，研究通过FPGA与DSP相结合的技术，建立超声合成孔径自适应成像实验系统。本项目还将基于图像配准方法，研究提高超声图像信噪比的方法。通过上述研究，全面认识超声合成孔径自适应高分辨成像的理论和技术原理，并提出今后的研究策略，为进一步研究实际应用系统，提供理论基础和实验数据。

中文关键词： 高分辨率超声成像；合成孔径超声；超声图像处理；自适应校正；相位畸变

英文摘要： The ultrasonic synthetic aperture imaging is one main technique of nondestructive testing for structure material. It has always been an important subject in the field, which further improving SNR and spatial resolution of ultrasonic images. From the approach of theoretical analysis, numerical simulation and experimental verification, this project will investigate that of the technique to real time control the transducers phase delay by adaptive technique according the relation between the phase delay and wave front. The imaging quality is estimated by the objective function of imaging system, and the high resolution image will be obtained. First, the theoretical model of ultrasonic synthetic aperture imaging is found. We will investigate the relations between the phase delay, wave front and spatial resolution through numerical simulation. Then, the numerical model of the phase delay controlling the wave front will be set on base of the adaptive correct principle. The optimization methods for adaptive technique also will be considered. With this methods, a experiment system of ultrasonic synthetic aperture adaptive imaging will be set with using FPGA and DSP joint technique. Also, the project will investigate the approach of image registration to increase the ultrasonic image SNR. Through above research, completely and systematically know the theory and principle of ultrasonic synthetic aperture adaptive high resolution imaging, and propose the study strategy in future. It will provide important fundamental basis and experimental data for further studying the real system.

英文关键词： high resolution ultrasonic imaging;synthetic aperture ultrasonic;ultrasonic image processing;adaptive correction;phase distortion