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磁共振成像信号的数字化接收系统设计
引用本文:李睿,肖亮,王为民.磁共振成像信号的数字化接收系统设计[J].波谱学杂志,2009,26(3):359-368.
作者姓名:李睿  肖亮  王为民
作者单位:北京大学,信息科学技术学院,北京,100871;万东医疗装备股份有限公司,北京,100016;北京大学,信息科学技术学院,北京,100871;万东医疗装备股份有限公司,北京,100016;北京大学,信息科学技术学院,北京,100871;万东医疗装备股份有限公司,北京,100016
基金项目:北京市重大攻关资助项目 
摘    要:磁共振成像信号的采集是磁共振成像系统当中最重要的环节之一,设计性能良好的信号接收系统直接关系到成像质量的好坏. 本文根据磁共振信号强度弱、频率高、带宽窄的特性对接收系统进行了统一设计. 详细地对可控增益放大、高速A/D、数字解调以及抽样滤波器等几个部分进行了讨论,给出一整套设计方案,尤其对多级抽样滤波器,根据磁共振成像的性能需求和滤波器的不同特性给出了抽样系数分配和滤波器设计的一般方法. 根据该方案设计出的磁共振信号接收系统有较高的信噪比,已经应用在临床医疗诊断当中. 

关 键 词:磁共振成像(MRI)  数字化接收系统  可控增益放大器  高速A/D  数字解调  抽样滤波器
收稿时间:2009-02-04
修稿时间:2009-02-23

The Design of a Digital Receiver System for MRI Scanners
LI Rui,XIAO Liang,WANG Wei-min.The Design of a Digital Receiver System for MRI Scanners[J].Chinese Journal of Magnetic Resonance,2009,26(3):359-368.
Authors:LI Rui  XIAO Liang  WANG Wei-min
Institution:1.School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China; 2.Wan Dong Medical Equipment Company, Beijing 100016, China
Abstract:The receiver system is an integrating part in the magnetic resonance imaging (MRI) scanner, and the performance of which affects the image quality directly. In this paper, the design of a digital receiver system was presented, which took into account the intrinsic properties of the MRI signals including weak amplitude, high frequency and narrow bandwidth. The role and the design of each part of the receiver system, such as controlled amplifier, high speed A/D, digital demodulator and decimating filter, were discussed in detail. A special sample rate distribution and filter design method were developed for the multi-stage decimating filter. The receiver system designed was used on diagnostic MRI systems, and showed good performance in terms of signal noise ratio.
Keywords:magnetic resonance imaging  digital receiving system  controlled amplifier  high speed A/D  digital demodulator  decimating filter
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