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0—1 integer linear programming for actively shielded magnetic resonance image (MRI) superconducting magnet design

Zhang Guo-Qing Du Xiao-Ji Zhao Ling Ning Fei-Peng Yao Wei-Chao Zhu Zi-An

0—1 integer linear programming for actively shielded magnetic resonance image (MRI) superconducting magnet design

Zhang Guo-Qing, Du Xiao-Ji, Zhao Ling, Ning Fei-Peng, Yao Wei-Chao, Zhu Zi-An
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  • Received Date:  07 March 2012
  • Accepted Date:  14 June 2012
  • Published Online:  20 November 2012

0—1 integer linear programming for actively shielded magnetic resonance image (MRI) superconducting magnet design

  • 1. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
  • 2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Abstract: Here introduced is an optimization design method for actively shielded magnetic resonance image (MRI) superconducting magnet based on the integer linear programming. The feasible coil space is densely divided by an array of candidate squares and, its size is determined by the size of actual superconducting wire. The 0—1 integer linear programming method is adopted to obtain the initial wire concentrated region of coils by comprehensivly considering superconductivity wire consumption, magnetic field intensity inside the superconductors, homogeneity in imaging region and the range of leak fields. Then by reasonably adjusting the position and section size of the wire concentrated region for the next calculation, the final MRI superconducting magnet structure with rectangular section coils is obtained. The method is based on the full size of the superconducting wire, which makes the MRI superconducting magnet design more feasible and has greater advantage for the actual fabriction. With different constraints, the method can also be used for other superconducting magnet design. Finally an example of the MRI magnet optimal design is presented.

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