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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
이병욱양세정
SCOPUS Author ID
이병욱scopus; 양세정scopus
Issue Date
2011
Journal Title
Magnetic Resonance Imaging
ISSN
0730-725XJCR Link
Citation
vol. 29, no. 3, pp. 401 - 407
Indexed
SCI; SCIE; SCOPUS WOS scopus
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
Appears in Collections:
엘텍공과대학 > 전자공학과 > Journal papers
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