DocumentCode
1228719
Title
A Novel Optimal Design Method of Passive Shimming for Permanent MRI Magnet
Author
Zhang, Yanli ; Xie, Dexin ; Bai, Baodong ; Yoon, Hee Sung ; Koh, Chang Seop
Author_Institution
Sch. of Electr. Eng., Shenyang Univ. of Technol., Shenyang
Volume
44
Issue
6
fYear
2008
fDate
6/1/2008 12:00:00 AM
Firstpage
1058
Lastpage
1061
Abstract
In magnetic resonance imaging (MRI) magnets, field shimming technique is, in general, necessary to increase the field homogeneity in imaging region to an acceptable level after manufacturing. This paper presents a novel passive shimming method using permanently magnetized shimming pieces. In the method, the shimming design is modeled as an integer programming problem, and the distribution of shimming pieces is optimized. Through an application to a 0.3-T permanent magnet MRI system, the optimally designed shimming pieces are proven to improve the field homogeneity from 1456 to 784 ppm after just one iteration of shimming courses is carried out.
Keywords
magnetic resonance imaging; permanent magnets; field homogeneity; field shimming; magnetic flux density 0.3 T; magnetic resonance imaging; optimal design method; passive shimming; permanent magnet; Integer programming; magnetic resonance imaging (MRI); optimization; permanent magnet (PM);
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.2007.916267
Filename
4527034
Link To Document