超声内窥镜图像数字扫描变换的研究与实现  

Digital Scanning Converter for Medical Endoscopic Ultrasound Imaging

作　　者：陈晓冬[1] 张红旭[1] 周佩璠[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：《生物医学工程学杂志》2009年第1期18-21,共4页Journal of Biomedical Engineering

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”资助(106048)

摘　　要：主要介绍了一种应用于医学超声内窥镜的数字扫描变换器(Digital scanning converter,DSC)原理、设计和实现。应用快速旋转矢量CORDIC算法(Fast modified vector rotational CORDIC,FMVR-CORDIC)进行坐标变换,用索引查找的方法替代算法中畸变因子的繁琐计算,提高超声扫描成像的速度。以FPGA为控制核心,完成数字信号处理及相关电路、芯片的逻辑控制。本设计结构简单,灵活性强,方便易行,完全满足医学超声内窥镜系统实时显示图像的要求。实验对采集到的原始图像进行坐标变换,获得了按直角坐标显示的灰度图像,验证了设计方案的正确性。This paper mainly introduces the design of digital scanning converter（DSC）for medical endoscopic ul- trasound imaging. Fast modified vector rotational CORDIC （FMVR-CORDIC） arithmetic complete coordinate con- version is used to increase the speed of. ultrasonic scanning imaging. FPGA is used as the kernel module to control data transferring, related circuits and relevant chips＇ working, and to accomplish data preprocessing. With the ad- vantages of simple structure, nice flexibility and convenience, it satisfies the demand for real-time displaying in this system. Finally, the original polar coordinate image is transformed to rectangular coordinate grey image through co- ordinate transformation. The system performances have been validated by the experimental result.

关 键 词：医学超声内窥镜 快速旋转矢量CORDIC算法 超声扫描成像 坐标变换 FPGA 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]