Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Shielded High-Order Gradient Coil Design for Magnetic Resonance Spectroscopy and Imaging

자기공명분석과 영상촬영을 위한 차폐된 고차경사자계코일의 설계

  • Oh, Chang-Hyun (Department of Medical Electronics, Korea University) ;
  • Hilal, Sadek K. (Department of Radiology, Columbia University) ;
  • Yi, Yun (Department of Medical Electronics, Korea University) ;
  • Kim, Min-Gi (Department of Medical Electronics, Korea University)
  • 오창현 (고려대학교 자연과학대학 의용전자공학과) ;
  • ;
  • 이윤 (고려대학교 자연과학대학 의용전자공학과) ;
  • 김민기 (고려대학교 자연과학대학 의용전자공학과)
  • Published : 1993.05.14
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Abstract

High-order field gradients are useful for spatial localization of a volume of interest and dynamic range improvement of signal detection in NMR (Nuclear Magnetic Resonance) spectroscopy and imaging. This paper proposes a design method of shielded high-order gradient coils to reduce tile effect of eddy current on tile spectroscopy and imaging results. According to the experimental results, the shielded gradient coils produce less than 2 % eddy current compared to non-shielded coils. Two shielded $z^2$ gradient coils have been designed and constructed for 1.5 T whole-body and 3.0 T animal NMR imaging systems. Experimental results are in good agreement with the theoretically expected behavior and show the utility of the shielded high-order gradient coils.

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