| 使用改进的形状优化方法设计高均匀度的超导MRI磁体 |
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| 引用本文： | 冯忠奎,李兰凯,胡格丽,李献,朱光,昌锟,许莹,周峰,戴银明.使用改进的形状优化方法设计高均匀度的超导MRI磁体[J].低温与超导,2013,41(4):45-49. |
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| 作者姓名： | 冯忠奎 李兰凯 胡格丽 李献 朱光 昌锟 许莹 周峰 戴银明 |
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| 作者单位： | 1. 中国科学院电工研究所应用超导重点实验室,北京100190;中国科学院大学,北京100049
2. 中国科学院大学,北京,100049 |
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| 摘 要： | 针对设计带铁磁的超导磁共振成像磁体,提出了一种确定类的优化算法来优化极靴的形状以达到匀场的目的。这种方法集合了灵敏度分析、形状优化的理论和有限元方法计算非线性铁磁材料极靴的配置,来改善两个极靴之间大体积成像区的磁场均匀度。需要指出的是,本优化方法不受极靴初始形状的限制,均可以快速收敛。我们通过一个紧凑型的1.2T双平面磁共振磁体,展示了这种方法。
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| 关 键 词： | 确定类优化算法 形状优化 灵敏度分析 超导MRI磁体 铁磁材料 |
Homogenous superconducting MRI magnet design using modified pole shape optimization |
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| Feng Zhongkui,Li Lanki,Hu Geli,Li Xian,Zhu Guang,Chang Kun,Xu Ying,Zhou Feng,Dai Yinming,Wang Qiuliang.Homogenous superconducting MRI magnet design using modified pole shape optimization[J].Cryogenics and Superconductivity,2013,41(4):45-49. |
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| Authors: | Feng Zhongkui Li Lanki Hu Geli Li Xian Zhu Guang Chang Kun Xu Ying Zhou Feng Dai Yinming Wang Qiuliang |
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| Institution: | 1.Key Laboratory of Applied Superconductivity,Institute of Electrical Engineering,Chinese Academy of Sciences, Beijing 100190,China; 2.University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | We presented a non-stochastic optimization method for optimizing the shapes of ferromagnetic materials to generate a target static magnetic field for an open superconducting MRI magnet.The method integrated sensitivity analysis and shape optimization with the finite element method(FEM) to calculate nonlinear ferromagnetic material configurations,devoting to improve the homogeneity of the magnetic field in a large imaging volume between the poles.It should be noted that the initial condition of the material shape was not critical for convergence.We demonstrate this method works well with a compact 1.2T yoked bi-planar MRI magnet. |
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| Keywords: | Non-stochastic optimization Shape optimization Sensitivity analysis Superconducting MRI magnet Ferromagnetic materials |
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