摘要
采取了二维有限元法模拟核磁共振成像（ＭＲＩ）装置的主磁场。给出了永磁材料的等效面电流层的数学物理模型，并对永磁材料的退磁化曲线进行了等效处理。然后，求出核磁共振成像装置的主磁场的能量泛函表达式，并给出了整个空间的磁力线分布，计算结果与实验相吻合，从而验证了这种方法的正确性。最后，提出了用被动补偿的方法来扩大均匀场区域。
The main magnetic field of Magnetic Resonace Imaging( MRI)device is simulated by using the finite element method.First the methed of equlvalent surface currents is adopted for modelling permanent magnets,and the demagnetiZation curve can be well approximated by a B-H curve,Then,a function of e nergy integral equation on the main field is written,and the distribution of field is shown。Numerical results agree well with experimental data, and thus prove the validity of this method.At last,in order to increasing the uniform field region,a passive compensating method is presented.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1995年第4期387-391,共5页
Journal of University of Electronic Science and Technology of China
关键词
磁场
核磁共振成像
等效面电流法
永磁材料
Finite element method
magnetic resonance imaging
method of equivalent surfacecurrents
permanent magnetic material
