3-D optimal shape design of pole piece in permanent magnet MRI using parameterized nonlinear design sensitivity analysis

Author

Ryu, Jae Seop ; Yao, Yingying ; Koh, Chang Seop ; Shin, Young Jun

Author_Institution

Electrotechnol. R&D Center, Cheongju

Volume

42

Issue

4

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

1351

Lastpage

1354

Abstract

The pole piece of a permanent magnet magnetic resonance imaging (MRI) is optimally designed in three-dimensional (3-D) space, taking into account the nonlinearity of materials to get high homogeneous magnetic fields in the working region. The pole face is parameterized using a B-spline surface and optimized using 3-D nonlinear design sensitivity analysis based on the 3-D finite-element method. An optimal design result shows how the nonlinear magnetic property of the yoke and column, as well as the pole piece, affect the magnetic-field homogeneity in the working region, although the MRI system has a large air gap

Keywords

finite element analysis; magnetic resonance imaging; permanent magnets; sensitivity analysis; splines (mathematics); 3D finite-element method; 3D optimal shape; B-spline surface; geometric parameterization; magnetic field homogeneity; magnetic resonance imaging; materials nonlinearity; nonlinear design sensitivity analysis; nonlinear magnetic property; permanent magnet MRI; pole piece; Design methodology; Design optimization; Finite element methods; Magnetic fields; Magnetic materials; Magnetic resonance imaging; Permanent magnets; Sensitivity analysis; Shape; Spline; Design sensitivity analysis; geometric parameterization; magnetic resonance imaging (MRI); nonlinear; permanent magnet;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.871563

Filename

1608465