Improved Configuration of Halbach Magnets with a Homogeneous Magnetic Field for Portable NMR Device

Authors

  • Yi-Yuan Cheng Department of Mechanical and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China
  • Ming-Yang Su Department of Environmental Engineering Henan Polytechnic Institute, Nanyang, 473000, China
  • Tao Hai Department of Mechanical and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China
  • Ming Hui Department of Physics and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China
  • Bao-lei Li Department of Physics and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China
  • Ling Xia Department of Biomedical Engineering Zhejiang University, Hangzhou, 310027, China

Keywords:

Halbach magnet, improved configuration, particle swarm optimization, portable NMR

Abstract

Halbach array magnets are widely used in portable nuclear magnetic resonance (NMR) devices that the homogeneity of the magnetic field generated by the array affects the imaging quality. In this paper, we propose some improvements to the construction of the Halbach magnets to enhance magnetic field uniformity. Using a Halbach array model comprising 16 magnets, all the calculations are based on 3D finite element method (FEM) analysis and optimized using the particle swarm optimization (PSO) algorithm. Comparisons of the results are shown to support the observations that the optimized and improved constructions can generate a more homogeneous magnetic field.

Author Biographies

Yi-Yuan Cheng, Department of Mechanical and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China

Yi-Yuan Cheng was born in Henan, China, in 1985. She received her B.E. degree in Biomedical Engineering from South-Central University for Nationalities, Wuhan, China, in 2008, and received Ph.D. degree in Biomedical Engineering from Zhejiang University, Hangzhou, China, in 2015. She is currently working as a Lecturer in the Department of Mechanical and Electrical Engineering in Nanyang Normal University, Nanyang, China. Her main research interests include MRI, design and optimization of magnet, artificial intelligence and so on.

Ming-Yang Su, Department of Environmental Engineering Henan Polytechnic Institute, Nanyang, 473000, China

Ming-Yang Su was born in Henan, China, in 1984. He received his Bachelor degree of Engineering from Qingdao University of Science and Technology, Qingdao, China, in 2006 and Master degree from Qingdao University of Science and Technology in 2010. He is currently working as a Lecturer in Henan Polytechnic Institute, Nanyang, China. His main interests in materials research.

Tao Hai, Department of Mechanical and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China

Tao Hai was born in Henan, China, in 1974. He received his Ph.D. degree in Signal and Information Processing from Harbin Engineering University, Harbin, China. He is currently working as a Lecturer in the Department of Mechanical and Electrical Engineering in Nanyang Normal University, Nanyang, China. His main research interests include signal processing, image processing and so on.

Ming Hui, Department of Physics and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China

Ming Hui was born in Henan, China, in 1983. He received his Ph.D. degree in Communication and Information System from Ningbo University, Ningbo, China, in 2013. He is currently working as an Associate Professor in the Department of Physics and Electrical Engineering in Nanyang Normal University, Nanyang, China. His main research interests include the design of high efficiency RF power amplifier and the linearization technology.

Bao-lei Li, Department of Physics and Electrical Engineering Nanyang Normal University, Nanyang, 473061, China

Bao-Lei Li was born in Henan, China, in 1987. He received his Ph.D. degree in Information and Communication Engineering from Yunnan University, Kunming, China. He is currently working as a Lecturer in the Department of Physics and Electrical Engineering in Nanyang Normal University, Nanyang, China. His main research interests include intelligent optimization algorithm, path planning and so on

Ling Xia, Department of Biomedical Engineering Zhejiang University, Hangzhou, 310027, China

Ling Xia was born in Zhejiang, China, in 1965. He received his B.E. degree in Automation and Ph.D. degree in Biomedical Engineering from Zhejiang University, Hangzhou, China. He is currently working as a Professor in the Department of Biomedical Engineering in Zhejiang University, Hangzhou, China. His main research interests include MRI key technical issues, biological effects of electromagnetic fields, Physiological simulation and modeling and so on.

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Published

2021-07-16

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