Title :
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
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;
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
