Title :
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
fDate :
6/1/2004 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.931023
