Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Magnetic field Inhomogeneity measurement algorithm using magnetic resonance

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  • Kim, H.J. (Department of Electrical Engineering, Kwangwoon University) ;
  • Kim, C.Y. (Department of Electrical Engineering, Kwangwoon University) ;
  • Han, S.Y. (Department of Electrical Engineering, Kwangwoon University) ;
  • Yoon, J.H. (Department of Electrical Engineering, Kwangwoon University) ;
  • Ahn, C.B. (Department of Electrical Engineering, Kwangwoon University)
  • 강휴정 (광운대학교 공과대학 전기공학과) ;
  • 김치영 (광운대학교 공과대학 전기공학과) ;
  • 한수영 (광운대학교 공과대학 전기공학과) ;
  • 윤종호 (광운대학교 공과대학 전기공학과) ;
  • 안창범 (광운대학교 공과대학 전기공학과)
  • Published : 1999.07.19
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Abstract

In this paper, we develope an algorithm to calculate field inhomogeneity in MR imaging using a dual fast spin echo pulse sequence. Because phase modulation time can be easily modified with this pulse sequence, high resolution image can be obtained and acquisition time can be reduced compared to gradient echo technique. In the case of phase wrapping in field map, phase corrected using image processing technique. We assume the field pattern to be second order polynomial and apply Pseudo-Inverse equation to calculate second order polynomial coefficients. These coefficients can be used for the shimming of the magnetic field.

Keywords