Earticle

초록

영어

Shimming, active and/or passive, is indispensable for most MR (magnetic resonance) magnets where homogeneous magnetic fields are required within target spaces. Generally, shimming consists of two steps, field mapping and correcting of fields, and they are recursively repeated until the target field homogeneity is reached. Thus, accuracy of the field mapping is crucial for fast and efficient shimming of MR magnets. For an accurate shimming, a "magnetic" center, which is a mathematical origin for harmonic analysis, must be carefully defined, Although the magnetic center is in general identical to the physical center of a magnet, it is not rare that both centers are different particularly in HTS (high temperature superconducting) magnets of which harmonic field errors, especially high orders, are significantly dependent on a location of the magnetic center. This paper presents a new algorithm, based on a field mapping theory with harmonic analysis, to define the best magnetic center of an MR magnet in terms of minimization of pre-shimming field errors. And the proposed algorithm is tested with simulation under gaussian noise environment.

목차

Abstract
 1. 서론
 2. 본론
  2.1. 기본 알고리즘의 설계
  2.2. 기본 알고리즘에 대한 시뮬레이션
  2.3. 확장 알고리즘의 설계
  2.4. 확장 알고리즘에 대한 시뮬레이션
 3. 결론
 참고문헌

키워드

저자

• 이우승 [ Woo Seung Lee | 학생회원, 연세대 대학원 전기공학과 석사과정 ]
• 안민철 [ Min Cheol Ahn | 정회원, 군산대 전기공학과 조교수 ] 교신저자
• 한승용 [ Seung-yong Hahn | 정회원,MIT, Research Staff ]
• 고태국 [ Tae Kuk Ko | 정회원, 연세대 전기전자공학과 교수 ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537