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• Technical Article •
The digital method for eddy-current precompensation based on high resolution gradient waveform generator
YANG Fan  XU Juncheng  YAO Shouquan  LI Jianqi  JIANG Yu 

Cite this article as: Yang F, Xu JC, Yao SQ, et al. The digital method for eddy-current precompensation based on high resolution gradient waveform generator. Chin J Magn Reson Imaging, 2020, 11(5): 354-359. DOI:10.12015/issn.1674-8034.2020.05.007.


[Abstract] Objective: A digital method for eddy-current precompensation based on high resolution gradient waveform generator is proposed.Materials and Methods: Digital precompensation waveform is calculated from standard gradient waveform by field programmable gate array (FPGA). Then the original waveform and precompensation waveform are transmitted into two separated digital-to-analog converters (DAC) and transformed to analog signals respectively. Finally, compensated waveform is generated by adding the two analog waveforms. Besides, the precompensation waveform described by five various exponential decay terms is calculated timely using high-speed clock and synchronization trigger method.Results: Digital eddy-current precompensation based on two 20 bit DACs achieved higher resolution, and more precise than 23 bit resolution. Meanwhile, this method considerably reduced delay time between compensated waveform and trigger signal as well as keep it constant.Conclusions: High resolution method achieves better experimental result than analog or traditional digital eddy-current precompensation method.
[Keywords] magnetic resonance imaging；gradient；eddy-current precompensation；preemphasis；field programmable gate array；digital-to-analog converter

YANG Fan Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China

XU Juncheng Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China

YAO Shouquan Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China

LI Jianqi Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China

JIANG Yu* Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China

*Correspondence to: Jiang Y, E-mail: yjiang@phy.ecnu.edu.cn

Conflicts of interest   None.

ACKNOWLEDGMENTS  This article is supported by the National Natural Science Foundation of China No. 21874045 Shanghai Science and Technology Innovation Action Plan No. 19142202900
Received  2020-02-22
Accepted  2020-04-10
DOI: 10.12015/issn.1674-8034.2020.05.007
Cite this article as: Yang F, Xu JC, Yao SQ, et al. The digital method for eddy-current precompensation based on high resolution gradient waveform generator. Chin J Magn Reson Imaging, 2020, 11(5): 354-359. DOI:10.12015/issn.1674-8034.2020.05.007.

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