基于单片FPGA的多通道磁共振成像接收模块

波谱学杂志 ›› 2012, Vol. 29 ›› Issue (2): 239-247.

基于单片FPGA的多通道磁共振成像接收模块

王洪¹，孙宏宇²，汤伟男²，林先钗³，王为民^2*

1. 泰山医学院放射学院，山东泰安 271016;
2. 北京大学信息科学技术学院量子电子学研究所，北京 100871；
3. 北京万东医疗装备股份有限公司磁共振成像产品事业部，北京 100016

收稿日期:2011-10-24 修回日期:2011-11-30 出版日期:2012-06-05 发布日期:2012-06-05
基金资助:
国家科技重大专项资助项目（2011ZX05008-004）.

An FPGA-Based Multi-Channel Receiver Module for Magnetic Resonance Imaging

WANG Hong¹, SUN Hong-Yu², TANG Wei-Nan², LIN Xian-Chai³, WANG Wei-Min^2*

1. Department of Radiology, Taishan Medical University, Tai'an 271016, China; 
2. Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China;
3. Beijing Wandong Medical Equipment Co., Ltd, Beijing 100016, China

Received:2011-10-24 Revised:2011-11-30 Online:2012-06-05 Published:2012-06-05
Supported by:
国家科技重大专项资助项目（2011ZX05008-004）.

摘要/Abstract

摘要：

提出了一种基于FPGA的多通道磁共振成像接收模块，能对多个独立通道的磁共振信号进行直接采样、数字下变频，以及数据流控制，并对其进行了成像实验. 设计中采用Xilinx公司的系统级DSP开发工具——System Generator对FPGA内部所有功能进行建模、仿真并生成相应的硬件描述语言. 模块的采样速率为80MSPS，能灵活实现1 kHz~1 MHz范围的可变接收带宽，适用于1 T以下的磁共振成像系统；在单片FPGA内完成1~4个通道采样信号的数字正交解调，抽取滤波和数据流的处理，并可扩展至8通道. 实验证明模块具有体积小，集成度高，可重构性强和成本低等特点，为磁共振成像谱仪的多通道接收系统提供了一种高性能的数字化解决方案.

关键词: 磁共振成像（MRI）, 数字化接收模块, 数字下变频, 现场可编程门阵列（FPGA）

Abstract:

A field programmable gate array (FPGA)-based multi-channel receiver module was developed for magnetic resonance imaging (MRI), with its performance evaluated by MRI experiments. Based on a single FPGA, this apparatus operates direct sampling, digital down conversion and data flow control for multi-channel MR signals. The system-level digital signal processing (DSP) development tools offered by Xilinx company——System Generator was used for FPGA function modeling, simulation and automatic code generation of HDL. The sampling rate of this module is 80 MSPS and the receiver bandwidth can be varied between 1 kHz and 1 MHz, thus the module is suitable for an MRI system with a magnetic field lower than 1 T. Inside the FPGA, digital quadrature demodulation, decimation filtering and data stream processing of one to four channels of sampled signals are performed, and the module is expandable to 8 channels. This module has features of small size, highly integrated and reconfigurable and low cost, providing a high-performance digital solution for multi-channel reception system of an MRI spectrometer.

Key words: MRI, digital receiver, digital down conversion, field programmable gate array

中图分类号:

O482.53

王洪, 孙宏宇, 汤伟男, 林先钗, 王为民. 基于单片FPGA的多通道磁共振成像接收模块[J]. 波谱学杂志, 2012, 29(2): 239-247.

WANG Hong, SUN Hong-Yu, TANG Wei-Nan, LIN Xian-Chai, WANG Wei-Min. An FPGA-Based Multi-Channel Receiver Module for Magnetic Resonance Imaging[J]. Chinese Journal of Magnetic Resonance, 2012, 29(2): 239-247.

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