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A strategy for achieving a low-field MRI magnet system with lightweight design and good magnetic field temperature stability |
| Peng Shen(沈鹏)1,5,6,7, Jiangqian Guo(郭江黔)2, Jingzhi Han(韩景智)1,†, Ziheng Zhang(张子衡)3,8, Xuegang Chen(陈学刚)4,‡, Wenyun Yang(杨文云)1, Jie Liu(刘杰)2, Xianghao Ji(季祥皓)4, Dong Zhou(周栋)5,7, and Jinbo Yang(杨金波)1,§ |
1 Institute of Condensed Matter and Material Physics, School of Physics, Peking University, Beijing 100871, China;
2 NingBo ChuanShanjia Electrical and Mechanical Co., Ltd., Yuyao 315699, China;
3 Beijing Ri-Bei Technology Co., Ltd., Beijing 102299, China;
4 Center of Free Electron Laser and High Magnetic Field, State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology, Anhui Provincial Key Laboratory of Magnetic Functional Materials and Devices, Anhui University, Hefei 230601, China;
5 Central Iron and Steel Research Institute, Beijing 100083, China;
6 Hefei Gangyan Rare Earth Permanent Magnetic Material Research Institute Co., Ltd., Hefei 230041, China;
7 State Key Laboratory of Rare Earth Permanent Magnetic Materials, Hefei 230041, China;
8 Beijing MagnVue Medix Co., Ltd., Beijing 101111, China |
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Abstract We developed a low field MRI magnet system utilizing a hybrid magnetic circuit composed of sintered neodymium iron boron (Nd-Fe-B) magnet and sintered samarium cobalt (Sm-Co) magnet based on the theoretical simulations. The static magnetic field of the magnet system with a magnetic pole plate diameter of 58 cm and a distance of 32 cm between the upper and lower pole plates reaches 0.07 T and exhibits magnetic field inhomogeneity fluctuations of less than 850 ppm over a temperature variation of $\pm 4 ^\circ$C around the set point of 24 $^\circ$C. While it merely weighs 384 kg. Our findings indicate that a hybrid magnetic circuit composed of these two types of magnets contributes to both the lightweight design and temperature stability of the MRI magnet system. Finally, we evaluated the imaging effects of this magnet system.
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Received: 04 December 2025
Revised: 09 February 2026
Accepted manuscript online: 23 February 2026
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PACS:
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75.50.Ww
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(Permanent magnets)
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07.55.Db
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(Generation of magnetic fields; magnets)
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41.20.Gz
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(Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems)
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07.55.-w
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(Magnetic instruments and components)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFB3507000 and 2021YFB3500300), the National Natural Science Foundation of China (Grant No. 52171167), partially supported by the Scientific Research Foundation of the Higher Education Institutions for Distinguished Young Scholars in Anhui Province, China (Grant No. 2022AH020012), the Innovation Project for Overseas Researcher in Anhui Province, China (Grant No. 2022LCX004), and the Facilities at Center of Free Electron Laser and High Magnetic Field (FEL & HMF) in Anhui University. |
Corresponding Authors:
Jingzhi Han, Xuegang Chen, Jinbo Yang
E-mail: hanjingzhi@pku.edu.cn;xgchen@ahu.edu.cn;jbyang@pku.edu.cn
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Cite this article:
Peng Shen(沈鹏), Jiangqian Guo(郭江黔), Jingzhi Han(韩景智), Ziheng Zhang(张子衡), Xuegang Chen(陈学刚), Wenyun Yang(杨文云), Jie Liu(刘杰), Xianghao Ji(季祥皓), Dong Zhou(周栋), and Jinbo Yang(杨金波) A strategy for achieving a low-field MRI magnet system with lightweight design and good magnetic field temperature stability 2026 Chin. Phys. B 35 057503
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