| A new simulated annealing method of designing NMR biplanar shim coils |
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| 引用本文： | QI Feng,TANG Xin,WANG Weimin,SHEN Yifei,LIU Shaopo,JIANG Zhongde. A new simulated annealing method of designing NMR biplanar shim coils[J]. 自然科学进展(英文版), 2006, 16(7): 747-752. DOI: 10.1080/10020070612330063 |
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| 作者姓名： | QI Feng TANG Xin WANG Weimin SHEN Yifei LIU Shaopo JIANG Zhongde |
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| 作者单位： | 1.Key Laboratory for Quantum Information and Measurements of Ministry of Education, School of Electronics Engineering & Computer Science, Peking University, Beijing 100871, China; 2. Institute of Heavy Ion Physics, and Beijing Key Laboratory of Medical Physics and Engineering, Physical School, Peking University, Beijing 100871, China |
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| 基金项目： | 国家高技术与发展计划(863计划);北京市科委资助项目 |
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| 摘 要： | A new SA (simulated annealing) method is presented for the design of longitudinal shim coils for NMR (nuclear magnetic resonance) equipment. First, AGL (adaptive Gauss-Lobatto) quadrature used by the traditional SA method is analyzed. Two kinds of complete elliptic integrals are introduced to integrate the spatial magnetic field, which increases the computing speed by 13.3 times. Then, the system energy calculation is extended to the field of the z-axis. The results illustrate that the coil-set efficiency designed by the new SA method is 15% higher than that of the traditional one, and the field inhomogeneity is reduced from 1.20% to 0.49%. Finally, a prototype of coil assembly for NMR rock-core analyzer is built, and the experimental results are in good agreement with the theoretically calculated results.
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| 关 键 词： | NMR shim coil design simulated-annealing method complete elliptic integral. |
A new simulated annealing method of designing NMR biplanar shim coils |
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| QI Feng,TANG Xin,WANG Weimin,SHEN Yifei,LIU Shaopo,JIANG Zhongde. A new simulated annealing method of designing NMR biplanar shim coils[J]. Progress in Natural Science, 2006, 16(7): 747-752. DOI: 10.1080/10020070612330063 |
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| Authors: | QI Feng TANG Xin WANG Weimin SHEN Yifei LIU Shaopo JIANG Zhongde |
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| Affiliation: | 1. Key Laboratory for Quantum Information and Measurements of Ministry of Education, School of Electronics Engineering & Computer Science, Peking University, Beijing 100871, China
2. Institute of Heavy Ion Physics, and Beijing Key Laboratory of Medical Physics and Engineering, Physical School, Peking University, Beijing 100871, China |
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| Abstract: | A new SA (simulated annealing) method is presented for the design of longitudinal shim coils for NMR (nuclear magnetic resonance) equipment. First, AGL (adaptive Gauss-Lobatto) quadrature used by the traditional SA method is analyzed. Two kinds of complete elliptic integrals are introduced to integrate the spatial magnetic field, which increases the computing speed by 13.3 times. Then, the system energy calculation is extended to the field of the z-axis. The results illustrate that the coil-set efficiency designed by the new SA method is 15% higher than that of the traditional one, and the field inhomogeneity is reduced from 1.20% to 0.49%. Finally, a prototype of coil assembly for NMR rock-core analyzer is built, and the experimental results are in good agreement with the theoretically calculated results. |
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| Keywords: | NMR shim coil design simulated-annealing method complete elliptic integral |
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