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공과대학
전자전기공학전공
Journal papers
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Local in vivo shimming using adaptive passive shim positioning
Title
Local in vivo shimming using adaptive passive shim positioning
Authors
Yang S.
;
Kim H.
;
Ghim M.-O.
;
Lee B.-U.
;
Kim D.-H.
Ewha Authors
이병욱
;
양세정
SCOPUS Author ID
이병욱
; 양세정
Issue Date
2011
Journal Title
Magnetic Resonance Imaging
ISSN
0730-725X
Citation
Magnetic Resonance Imaging vol. 29, no. 3, pp. 401 - 407
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo. © 2011 Elsevier Inc.
DOI
10.1016/j.mri.2010.10.004
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