波谱学杂志 ›› 2007, Vol. 24 ›› Issue (4): 433-438.

• 祝贺邬学文先生八十华诞(专辑) • 上一篇    下一篇

一种具有自触发功能的高精度梯度波形发生器

刘燕,宁瑞鹏,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:刘燕(1983-),女,江西人,硕士研究生,无线电物理专业.*通信联系人: 李鲠颖,电话:021-62233286,  E-mail:gyli@phy.ecnu.edu.cn.
  • 基金资助:

    上海市科委项目(06DZ22014, 06DZ22922)资助.

A Self-riggering Gradient Waveform Generator for MRI Scanner

LIU Yan, NING Rui-peng, 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:gyli@phy.ecnu.edu.cn.
  • Supported by:

    上海市科委项目(06DZ22014, 06DZ22922)资助.

摘要:

提出一种具有自触发功能的高精度梯度波形发生器,其主要特点在于其采用了高精度(24 位)DAC,并具有自触发功能,使梯度波形发生器能独立于脉冲序列发生器工作,从而解决了高精度DAC群延时的问题.

关键词: 磁共振成像, 梯度延时, 梯度波形发生器

Abstract:

A design of a gradient waveform generator with self-triggering function for magnetic resonance imaging (MRI) is proposed. In the present design, a high precision DAC (24-bit) chip having a relatively large group delay is used. With this design and the proposed self-triggering technique, the group delay of gradient waveforms can be eliminated. As a result, high precision DAC can be applied to MRI scanner.

Key words: MRI, group delay, gradient waveform generator

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