Analysis of magnetic field of MRI device taking account of anisotropy and hysteresis

Author

Wang, Xiaoyan ; Xie, Dexin ; Bai, Baodong

Author_Institution

Shenyang Univ. of Technol., Shenyang

fYear

2007

fDate

8-11 Oct. 2007

Firstpage

1410

Lastpage

1413

Abstract

This paper presents a new method to simulate the magnetic characteristics of permanent magnet type of magnetic resonance imaging (MRI) device. The pulse currents in the gradient coils will introduce the effect of eddy currents and hysteresis in ferromagnetic material, which will worsen the quality of imaging. In order to reduce eddy currents in the ferromagnetic material, the passive shield made of Fe-Si lamination is used in MRI system. Anisotropy of the passive shield is considered. Combining Preisach model with finite element analysis, the hysteresis characteristic is simulated.

Keywords

biomedical NMR; coils; eddy currents; ferromagnetic materials; finite element analysis; hysteresis; iron compounds; laminations; magnetic fields; permanent magnets; silicon compounds; Fe-Si lamination; MRI device; anisotropy; eddy current; ferromagnetic material; finite element analysis; gradient coils; hysteresis; magnetic field; magnetic resonance imaging device; permanent magnet type; pulse currents; Anisotropic magnetoresistance; Eddy currents; Magnetic analysis; Magnetic anisotropy; Magnetic devices; Magnetic fields; Magnetic hysteresis; Magnetic materials; Magnetic resonance imaging; Perpendicular magnetic anisotropy;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Machines and Systems, 2007. ICEMS. International Conference on

Conference_Location

Seoul

Print_ISBN

978-89-86510-07-2

Electronic_ISBN

978-89-86510-07-2

Type

conf

Filename

4412071