基于线性调频信号的高帧率超声成像系统  

High Frame Rate Ultrasonic Imaging System Based-on Linear Frequency-Modulated Signal

作　　者：韩雪梅[1] 彭虎[1] 杜宏伟[1] 冯焕清[1] 

机构地区：[1]中国科学技术大学电子科学与技术系,合肥230026

出　　处：《中国生物医学工程学报》2005年第6期700-704,共5页Chinese Journal of Biomedical Engineering

基　　金：国家自然科学基金资助项目(60471057)

摘　　要：基于有限衍射波束的高帧率超声成像系统能实现快速成像,但由于仅通过一次发射事件成像,信噪比较低,本研究针对该问题提出一种改进方案。它采用合成孔径雷达中所使用的线性调频信号作为激励信号,在接收端则利用线性调频信号的脉冲压缩比等于信号的时间带宽积的特征,将接收信号通过匹配滤波器处理。结果表明该方案不仅能显著提高成像系统的信噪比,改善重构图像的质量,增加成像深度,而且不损失分辨率。The high frame rate （HFR） ultrasonic imaging system developed with limited diffraction beams constructs images at a high frame rate. Because of constructing image by one transmission, the system has an obvious limitation of low signal-to-noise rate（SNR）. In this paper, we proposed a method using linear frequency-modulated signal （or chirp） as excited signal. For the higher time-bandwidth（TB） products available in chirp, the received signals Were passed through a matched filter. The results show that the higher SNR offered by chirp excitation exhibited improved image quality and provided increased penetration in medical ultrasonic imaging.

关 键 词：高帧率 平面波 线性调频信号 超声成像 

分 类 号：R318.04[医药卫生—生物医学工程]