| 磁共振信号并行高速接收系统设计 |
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| 引用本文： | 严政,赵武贻,王慧贤,胡丽丽,杨文晖.磁共振信号并行高速接收系统设计[J].波谱学杂志,2011,28(2):198-206. |
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| 作者姓名： | 严政 赵武贻 王慧贤 胡丽丽 杨文晖 |
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| 作者单位： | 1.中国科学院 电工研究所，北京 100190； 2.中国科学院 研究生院，北京 100049 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 针对低场磁共振成像系统，该文设计了一种紧凑灵活的信号接收方案，实现对多通道磁共振信号的高速采样与直接数字解调. 系统采用高速模数转换器(A/D)对磁共振信号直接采样；以单片数字下变频器(DDC)--AD6636, 完成4路采样信号的数字解调；以数字信号处理器（DSP）作为控制器,实现对AD6636的配置以及I/Q数据的读取. 信号采样频率可达100 MSPS，适用于1 T以下的系统. 实验证明该设计具有结构紧凑，采样速率高，配置方便快速，滤波器设计丰富灵活等特点，为磁共振成像谱仪的研制提供了一种高性能的信号接收方案.
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| 关 键 词： | 磁共振成像(MRI) 多通道 数字下变频 AD6636 |
| 收稿时间： | 2010-09-16 |
Design of a Parallel High-Speed Receiving System |
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| YAN Zheng,ZHAO Wu-yi,WANG Hui-xian,HU Li-li,YANG Wen-hui.Design of a Parallel High-Speed Receiving System[J].Chinese Journal of Magnetic Resonance,2011,28(2):198-206. |
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| Authors: | YAN Zheng ZHAO Wu-yi WANG Hui-xian HU Li-li YANG Wen-hui |
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| Institution: | 1. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;;
2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In this paper,a compact and flexible signal receiving system mainly designed for low-field MRI systems is presented,which is capable of sampling multi-channel magnetic resonance signals simultaneously at a high speed and demodulating them directly.A digital down conversion chip(AD6636) was used to demodulate and decimate the signals from the four channels in a quadrature way.Digital signal processing(DSP) methods were used to complete the configuration of AD6636 and read out the I/Q data either from all cha... |
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| Keywords: | AD6636 |
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