Title :
Three-dimensional optimization of correction iron pieces for open high field MRI system
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. In order to homogenize magnetic fields in the field of view, an optimization method to determine initial configurations of large correction iron pieces was developed. In our method, we combined linear programming (LP) and 3D magnetic FEA and, using analytic formulae for LP, we computed field harmonics due to the volume of magnetized iron.
Keywords :
finite element analysis; linear programming; magnetic fields; magnetic resonance imaging; magnetisation; superconducting magnets; 0.7 T; 3D magnetic FEA; MRI magnet; analytic formulae; correction iron pieces; field harmonics; linear programming; magnetic fields homogeneity; magnetized iron; open high field MRI system; Iron; Linear programming; Magnetic analysis; Magnetic fields; Magnetic moments; Magnetic resonance imaging; Magnetic shielding; Magnetization; Optimization methods; Shape; Correction iron pieces; linear programming; optimization; uniform magnetic field;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.831019
