|Table of Contents|

Measuring method of saturation magnetization for grain-orientedsilicon steel sheet in magnetic resonance imaging(PDF)


Research Field:
Publishing date:


Measuring method of saturation magnetization for grain-orientedsilicon steel sheet in magnetic resonance imaging
Li Li12Ping Xuewei1Yin Xinghui1Mou Shanxiang2
1.College of Computer and Information Engineering,Hohai University,Nanjing 211100,China; 2.School of Electronic and Optical Engineering,Nanjing University of Scienceand Technology,Nanjing 210094,China
silicon steel sheets saturation magnetization passive shimming magnetic resonance imaging gradient coils superconducting magnet
A measuring method of saturation magnetization for oriented silicon steel sheets in engineering application is proposed here. Silicon steel sheets are placed into the shim rails distributed on the gradient coils and the axial magnetization of sampling points is measured through using the magnet field camera. The saturation magnetization of grain-oriented silicon steel sheets is obtained by iterative optimization algorithms. The result of the saturation magnetization can make the passive shimming of the magnetic resonance imaging system more efficient and improve the imaging quality. The method is convenient and easy for practice use. It needs less computation load and is more efficient.


[1] 石澄贤,王平安,夏德深. Snakes外力场的改进及其左心室MRI的精确分割[J]. 南京理工大学学报,2006,30(1):76-80.
Shi Chengxian,Wang Pingan,Xia Deshen. Improved external force field for Snakes and accurate segmentation of left ventricle MRI[J]. Journal of Nanjing University of Science and Technology,2006,30(1):76-80.
[2]Doni B,Vermilyea M E,Toffolo W E. Passive shimming of MR magnets:Algorithm,hardware,and results[J]. IEEE Transactions on Applied Superconductivity,1993,3(1):254-257.
[3]Liu Feng,Zhu Jianfeng,Xia Ling,et al. A hybrid field-harmonics approach for passive shimming design in MRI[J]. IEEE Transactions on Applied Superconductivity,2011,21(2):60-67.
[4]Kotnala R K,Kothari P C. Magnetic measurements on electrical steel strips using standard Epstein frame[J]. Indian Journal of Pure & Applied Physics,2000,38:797-800.
[5]Kockar H,Meydan T. Specific power loss comparisons of magnetic strips using standard Epstein frame[J]. Journal of the Korean Physical Society,2002,40(5):918-920.
[6]张俊鹏,张晗,向前,等. 电工钢方圈磁性测量偏差影响因素的探讨[J]. 钢铁研究,2017,45(4):38-41.
Zhang Junpeng,Zhang Han,Xiang Qian,et al. Discussion on influence factors of magnetic measurement deviation of electrical steel by Epstein frame[J]. Research on Iron and Steel,2017,45(4):38-41.
[7]Ping Xiewei,Zhu Zihui,Yin Xinhui,et al. Finite element simulation of eddy currents induced by gradient coils in superconducting MRI[C]//Proceedings of IEEE International Conference on Computational Electromagnetics. Guangzhou,China:IEEE,2016:37-39.
[8]Hu Yang,Wang Qiuliang,Hu Xinning,et al. A simulation study on the design of gradient coils in MRI for the imaging area above the patient bed[J]. Measurement Science & Technology,2017,28(3):035402.
[9]Jia F,Schultz G,Testud F,et al. Performance evaluation of matrix gradient coils[J]. Magnetic Resonance Materials in Physics Biology & Medicine,2016,29(1):59-73.
[10]Romeo F,Hoult D I. Magnet field profiling:Analysis and correcting coil design[J]. Magnetic Resonance in Medicine,1984,1(1):44-65.
[11]Hoult D I,Lee D. Shimming a superconducting nuclear magnetic resonance imaging magnet with steel[J]. Review of Scientific Instruments,1985 56(1):131-135.
[12]Jackson J D. Classical electrodynamics[M]. New York,US:Wiley,1975.


Last Update: 2018-10-30