Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Actively-Shielded Brain-Only $R^{2}$-Gradient Coil for Localized MRI/MRS

Localized MRI/MRS를 위한 차폐된 두뇌촬영용 $R^{2}$-경사자계코일

  • Oh, C.H. (Department of Electronics and Info. Engr., Korea University) ;
  • Yang, Y.J. (Department of Electronics and Info. Engr., Korea University) ;
  • Kim, S.K. (Department of Electronics and Info. Engr., Korea University) ;
  • Yi, Y. (Department of Electronics and Info. Engr., Korea University) ;
  • Lee, H.K. (Medison Ltd.) ;
  • Ahn, C.B. (Kwangwoon University)
  • 오창현 (고려대학교 전자및정보공학부) ;
  • 양윤정 (고려대학교 전자및정보공학부) ;
  • 김선경 (고려대학교 전자및정보공학부) ;
  • 이윤 (고려대학교 전자및정보공학부) ;
  • 이흥규 ((주)메디슨) ;
  • 안창범 (광운대학교)
  • Published : 1996.11.15
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Abstract

An actively-shielded $r^{2}$-gradient coil has been developed for brain localized MRI or MRS. Spatial localization is very useful for spatial volume selection in MRI or MR Spectroscopy(MRS). The radial(or $R^{2}-$) gradient coil is useful in reducing the artifact or in improving the SNR by selecting the volume with less number of RF pulses. It is, however, difficult to implement the coil with a gradient intensity strong enough to use it for practical whole-body MRI system. For example, the smallest volume size for selection is just 6 cm in diameter with a 250 Ampere of current driving for a whole-body system (in case of 70-cm-diameter). In this study, an asymetric $r^{2}$-coil with a small diameter of 35 cm has been designed and implemented for brain localized MRI or MRS. An 8-rod high-pass-type birdcage RF coil has also been implemented. The coil set has been developed for 1.0 Tesla Medison MRI system and its performance has been verified experimentally.

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