Shielding stray magnetic fields of open high field MRI magnets

Author

Kakugawa, S. ; Hino, N. ; Komura, A. ; Kitamura, M. ; Takeshima, H. ; Yatsuo, T. ; Tazaki, H.

Author_Institution

Hitachi Res. Lab., Hitachi Ltd., Ibaraki, Japan

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1639

Lastpage

1642

Abstract

We have developed a new magnet for open high field (0.7 T) MRI systems. Since MRI systems are installed in hospital sites, it is important to reduce stray magnetic fields of the magnets. We studied passive, active and hybrid shielding methods and compared them. In order to study feasibility of active shielding, we considered higher order multipole stray fields. We present details of the calculation method and the results.

Keywords

biomedical MRI; linear programming; magnetic shielding; superconducting magnets; 0.7 T; MRI systems; active shielding; homogeneous magnetic fields; hospital sites; magnetic resonance imaging; medical diagnostics; multipole stray fields; open high field MRI magnets; open-type magnets; optimization; shielding methods; stray magnetic fields; Coils; Hospitals; Iron; Laplace equations; Magnetic flux; Magnetic resonance imaging; Magnetic shielding; Medical diagnosis; Saturation magnetization; Superconducting magnets; Linear programming; MRI; magnetic resonance imaging; multipole stray field; optimization;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.931023

Filename

1325118