MRI系统中的正交技术

北京大学学报（自然科学版）

MRI系统中的正交技术

姜忠德,俎栋林,谷晓芳

北京大学物理学院重离子物理研究所，医学物理和工程北京市重点实验室，北京，100871

收稿日期:2005-04-08 出版日期:2006-05-20 发布日期:2006-05-20

Quadrature Modulation, Quadrature Exciting, Quadrature Receiving and Quadrature Demodulation in MRI System

JIANG Zhongde, ZU Donglin, GU Xiaofang

Institute of Heavy Ion Physics, Beijing Key Lab of Med Phys & Eng, Peking University, Beijing, 100871

Received:2005-04-08 Online:2006-05-20 Published:2006-05-20

摘要/Abstract

摘要： 阐明了MRI系统中所使用的正交调制、正交解调、正交激发和正交接收的概念。正交调制的目的是产生单边带RF激发脉冲，以避免激发镜像层面。正交解调能够区分正负频率，克服图像数据空间定位的不确定性。正交激发和正交接收是指运用圆极化RF线圈。指出在MRI系统中，这些正交处理是系统最佳化所要求的。阐述了这些正交处理所要求的条件以及所带来的好处，以及在系统设计和机器调试时所应遵循的原则。

关键词: MRI, 正交调制, 正交激发, 正交接收, 正交解调

Abstract: It is clearly clarified the conceptions of quadrature modulation, quadrature exciting, quadrature receiving, and quadrature demodulation in the MRI system. The purpose of quadrature modulation is to generate the SSB RF exciting pulse that avoids exciting it's mirror slice. Quadrature demodulation can distinguish positive and negative frequency so it can overcome position uncertainties on imaging data space. Quadrature exciting and quadrature receiving refer to make use of circular polarization RF coils. These quadrature operations are necessary for the optimization of MRI system and they bring some significant benefit.

Key words: MRI, quadrature modulation, quadrature exciting, quadrature receiving, quadrature demodulation

中图分类号:

O482.53⁺²

姜忠德,俎栋林,谷晓芳. MRI系统中的正交技术[J]. 北京大学学报（自然科学版）.

JIANG Zhongde,ZU Donglin,GU Xiaofang. Quadrature Modulation, Quadrature Exciting, Quadrature Receiving and Quadrature Demodulation in MRI System[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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https://xbna.pku.edu.cn/CN/Y2006/V42/I3/320

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