波谱学杂志 ›› 2007, Vol. 24 ›› Issue (4): 439-445.

• 祝贺邬学文先生八十华诞(专辑) • 上一篇    下一篇

磁共振成像数字谱仪的射频发射/接收通道相位相干性的研究

宁瑞鹏,刘燕,任洁静,李鲠颖*   

  1. 上海市功能磁共振成像重点实验室,华东师范大学 物理系,上海 200062
  • 收稿日期:2007-08-28 出版日期:2007-12-05 发布日期:2007-12-05
  • 作者简介:宁瑞鹏(1980-),女,黑龙江人,硕士,无线电物理专业.*通讯联系人:李鲠颖,电话:021-62233286,  E-mail:gyli@phy.ecnu.edu.cn.
  • 基金资助:

    上海市科委科研计划项目资助(06DZ22014, 06DZ11315).

Phase Coherence between RF Transmitter and Receiver in Digital MRI Spectrometer

NING Rui-peng, LIU Yan, REN Jie-jing, LI Geng-ying*   

  1. Shanghai Key Laboratory of Functional Magnetic Resonance Imaging, Department of Physics, East China Normal University, Shanghai 200062 China
  • Received:2007-08-28 Online:2007-12-05 Published:2007-12-05
  • About author:*Corresponding author:Li Gengying, Tel:02162233286, Email:gyl@phy.ecnu.edu.cn.
  • Supported by:

    上海市科委科研计划项目资助(06DZ22014, 06DZ11315).

摘要:

讨论了一种在核磁共振成像数字谱仪中保证射频发射机与接收机之间射频信号相位相干的方法,该方法在成像脉冲序列执行过程中,同步切换发射机与接收机的频率,并在脉冲序列最后,将发射和接收频率恢复到脉冲序列最初的频率值,从而实现发射与接收的信号相干,其优点是无需加入额外的"回绕延时",从而使得脉冲序列的编写得到简化,并且该方法不依赖于磁共振谱仪发射机和接收机硬件部分的具体结构,是适用于数字化谱仪的一种普遍的方法.

关键词: 磁共振成像, 射频发射, 射频接收, 相位相干

Abstract:

Phase coherence between RF transmitter and receiver in digital MRI spectrometer was studied. In order to keep phase coherence between the transmitter and the receiver, we implemented a method in which the frequencies of the transmitter and the receiver were switched simultaneously during pulse sequence execution, and reset to their original values, respectively, at the end of sequence. The experimental results showed that this method is suitable for digital spectrometer and independent on the structure of transmitter and receiver.

Key words: magnetic resonance imaging, RF transmitter, RF receiver, phase coherence

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