| 拓扑优化在Halbach核磁共振磁体主动垫补中的应用 |
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| 引用本文： | Xiao Jijun,肖继军,张一鸣,陈继忠,郑传行. 拓扑优化在Halbach核磁共振磁体主动垫补中的应用[J]. 分析仪器, 2007, 0(1): 19-23 |
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| 作者姓名： | Xiao Jijun 肖继军 张一鸣 陈继忠 郑传行 |
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| 作者单位： | 中国科学院研究生院,北京,100088;北京工业大学电子信息与控制工程学院,北京,100022 |
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| 摘 要： | 针对Halbach阵列核磁共振主磁体的匀场问题,提出用拓扑优化法对主磁体进行主动垫补的方法.在使用相对密度法描述优化空间材料特性、使用连续性方法推导出拓扑优化灵敏度的基础上,用最速下降法优化垫补磁块的空间位置.数值计算结果表明,本方法能达到匀场的目的.
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| 关 键 词： | Halbach核磁共振 磁体垫补 拓扑优化 相对密度法 灵敏度分析 |
| 修稿时间： | 2006-08-17 |
Application of topology optimization to active shimming of main magnet in Halbach NMR |
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| Xiao Jijun. Application of topology optimization to active shimming of main magnet in Halbach NMR[J]. Analytical Instrumentation, 2007, 0(1): 19-23 |
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| Authors: | Xiao Jijun |
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| Affiliation: | 1. Graduate school of Chinese Academy of Sciences, Beijing, 100088; 2. College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, 100022 |
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| Abstract: | To obtain homogeneous field in Halbach NMR, a topology optimization method is presented for active shimruing of the main magnet. Based on describing the characteristics of materials in optimization region with relative density method and deriving the sensitivity of topology optimization with continium method, the steepest descent method is used to optimize the arrangement of shimming magnets. The results of numerical calculation demonstrate that this method can homogenize the field distribution in the resonance region. |
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