Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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A New Spatial Localization Technique Using High-Order Surface Gradient Coils (SGC)

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  • Lee, J.K. (Department of Medical Electronics, Korea University) ;
  • Yang, Y.J. (Department of Medical Electronics, Korea University) ;
  • Jeong, S.T. (Department of Information and Communications Engineering, KAIS) ;
  • Yi, Y. (Department of Medical Electronics, Korea University) ;
  • Cho, Z.H. (Department of Information and Communications Engineering, KAIS) ;
  • Oh, C.H. (Department of Medical Electronics, Korea University)
  • 이종권 (고려대학교 자연과학대학 의용전자공학과) ;
  • 양윤정 (고려대학교 자연과학대학 의용전자공학과) ;
  • 정성택 (한국과학원 정보 및 통신공학과) ;
  • 이윤 (고려대학교 자연과학대학 의용전자공학과) ;
  • 조장희 (한국과학원 정보 및 통신공학과) ;
  • 오창현 (고려대학교 자연과학대학 의용전자공학과)
  • Published : 1994.12.03
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Abstract

A new spatial localization technique using high-order surface gradient coil (SGC) is proposed. Although the Spatial Selection with High-Order gradient (SHOT) can provide a 2-D selection with only one selective RF pulse, the high-order gradient produced by cylindrical-shape coils has not been clinically useful for clinical systems due to the large minimum selection size caused by the limited radial gradient intensity. However, by using the proposed high-order SGCs located near the imaging region, the size of volume selection can be reduced to a clinically useful 1-4 cm in diameter by applying stronger radial gradient with much less gradient driving power. A 40 cm-by-40 cm $r^{2}$ SGC has been designed and constructed, and phantom and volunteer studies have been performed. Experimental results using spatially localized MRI show good agreement to the theoretically predicted behavior.

Keywords