波谱学杂志 ›› 2009, Vol. 26 ›› Issue (1): 44-50.

• 研究论文 • 上一篇    下一篇

基于DSP技术的梯度波形发生器

戴祎栋; 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:2008-09-09 修回日期:2008-10-05 出版日期:2009-03-05 发布日期:2009-12-05
  • 通讯作者: 李鲠颖

A Gradient Waveform Generator Based on DSP Technology

DAI Yi-dong; NING Rui-peng; LI Geng-ying*   

  1. (Key Laboratory of Functional Magnetic Resonance Imaging, Department of Physics, East China Normal University, Shanghai 200062, China)
  • Received:2008-09-09 Revised:2008-10-05 Online:2009-03-05 Published:2009-12-05
  • Contact: LI Geng-ying

摘要: 提出一种用于磁共振成像的数字预加重梯度波形发生器. 它基于PCI总线,特点是采用数字信号处理(DSP)技术,以及高精度、高转换速率、低群延时的数模转换(DA)芯片. 因为所选DSP具有很强的实时运算能力,所以此梯度波形发生器能够包含5个不同时间常数及相应幅度的预加重信号处理单元. 本文给出了详细的设计过程,并给出了实验结果.

关键词: 梯度波形发生器, 磁共振成像, DSP, 涡流, 预加重

Abstract: A high performance gradient waveform generator based on the peripheral component interconnect (PCI) bus, digital signal processing (DSP) and 24-bit digital-to-analog converter (DAC) technologies were designed and made for uses in magnetic resonance imaging. The main feature of the design is that the gradient waveform generator contains up-to 5 pre-emphasis units with different time constants and corresponding amplitudes. The details about the design of the gradient waveform generator and the experimental result obtained using this device were given in the paper.

Key words: MRI, gradient waveform generator, DSP, eddy current, pre-emphasis

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