基于FPGA的数字超声内窥镜接收系统设计  

Design of Receiving System of Digital Ultrasonic Endoscope Based on FPGA

作　　者：温世杰[1] 鲁冬杰[1] 陈晓冬[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,教育部光电信息技术科学重点实验室,天津300072

出　　处：《传感技术学报》2008年第8期1329-1332,共4页Chinese Journal of Sensors and Actuators

基　　金：教育部重点项目资助"医用超声内窥镜关键技术研究(106048)";863专项资助"医学超声电子内窥镜的研制(2007AA04Z339)"

摘　　要：根据数字超声成像的要求和超声信号的特点,设计了由高速采样电路和FPGA正交解调电路组成的数字超声内窥镜接收系统。采样电路由AD8138和AD9235实现,对放大后的超声回波信号直接进行模数转换;FPGA利用内部RAM、乘法器、IP核和宏模块构建数字正交解调电路,提取超声回波信号的幅度;获取的幅度信息经USB2.0接口电路送入计算机显示。对玻璃杯进行的静止扫描成像实验,验证了接收系统的小信号检测能力,可以检测到信噪比约为4dB的回波信号;对玻璃杯进行的旋转扫描成像实验,表明接收系统可用于数字超声内窥镜成像。According to the requirement of digital ultrasonic imaging, a receiving system is designed for digital ultrasonic endoscope which is composed of a high-speed ADC and a quadrature demodulation circuit based on FPGA. The ADC directly samples the amplified echo using AD8138 and AD9235; FPGA extracts the envelope of digital echo by its internal digital quadrature demodulation circuit which is implemented by RAM, multiplier, IP core and megafunctions in FPGA; amplitude of echo is transferred to computer for imaging through USB2. 0 interface. The experiment of stationary scanning glass proves the detecting ability of the receiving system, which can obtain the amplitude of signals whose SNR is 4 dB. The experiment of rotating scanning glass proves that the receiving system can be utilized in digital ultrasonic endoscope.

关 键 词：内窥镜 超声信号 正交解调 FPGA 

分 类 号：TH785.5[机械工程—仪器科学与技术]