超声增益补偿中的带通滤波器设计  

Design of bandpass filter in amplified & time gain compensation

作　　者：陈晓冬[1] 付永强[1] 王小华[1] 温世杰[1] 郁道银[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《现代仪器》2007年第5期43-45,共3页Modern Instruments

基　　金：教育部重点项目"医用超声内窥镜关键技术及数字化研究(106048)"

摘　　要：根据内窥超声成像系统的要求,设计一种用于超声增益补偿中的改进结构带通滤波电路。增益补偿将超声回波按增益——传播距离的曲线放大,同时系统中的噪声也按照此曲线放大,在图像上表现为距离探头越远,噪声越大,图像信噪比受到影响。实验表明,由运算放大器AD8021组成的改进结构带通滤波器能够有效避免常规滤波器调试过程中的自激现象,同时满足微型高频超声探头滤波要求。This paper introduces a band -pass filter （BPF） circuit which is used in Time Gain Compensation （TGC） of medical ultrasonic endoscope imaging system. The function of TGC is to compensate the signal attenuation at the rate of curve , however, the noise is amplified in the same way, which leads to the error of the image and the loss of signal - to - noise ratio （SNR）. Using the ADS021, an improved BPF circuit which is different from conventional ones is designed to solve these problems. The experiment proves that the circuit can avoid the selfexcitation and also meet the requirement of the high frequency miniature ultrasonic probe.

关 键 词：内窥成像 微型超声探头 增益补偿 带通滤波 

分 类 号：TN713[电子电信—电路与系统]