用软件无线电方法实现MRI回波信号接收  

Receiving MRI Echo with Software-Defined Radio Approach

作　　者：胡曾千[1] 金涛[1] 章新明 

机构地区：[1]1.深圳清华大学研究院,广东深圳518057 [2]Analog Device Inc.深圳代表处,广东深圳518031

出　　处：《波谱学杂志》2013年第1期29-39,共11页Chinese Journal of Magnetic Resonance

摘　　要：该文首先简要介绍了软件无线电的基本原理和基于软件无线电的射频接收系统的3种结构形式:射频全宽开低通采样结构,射频直接带通采样结构和宽带中频带通采样结构;并介绍了磁共振成像(MRI)回波信号接收的基本原理和将软件无线电方法应用于MRI回波信号接收的意义.然后该文重点介绍了采用3种软件无线电结构实现MRI回波信号接收系统的具体设计方案,包括接收系统方框图、工作原理、设计参数的选择和分析、部分功能模块的实现方法、设计和实现中需要注意的问题.最后以一个低场通用MRI回波接收系统为实例,分析比较了3种设计方案并给出了实际系统的测试结果.This paper briefly introduces software-defined radio, as well as three types of radio frequency （RF） receiving system based on the method of software-defined radio. RF sampling with low-pass filtering for fully bandwidth; RF directly sampling with band-pass filtering for narrow band signal and IF sampling with band-pass filtering for broad band signal. Then basic principles of receiving MRI echo with the method of soft- ware-defined radio are explained. The actual design of RF receiving system for MRI echo with the software-defined radio was presented, including receiving system dia- gram, working principle, selection and analysis of design parameters, implementation of some function module, and issues that should be considered during design and imple- mentation. Analysis and comparison of three types of RF receiving system based on software-defined radio for low field MRI spectrometer were given.

关 键 词：磁共振成像(MRI) 回波信号接收 软件无线电 中频采样 射频采样 带通采样 

分 类 号：R445.2[医药卫生—影像医学与核医学]