摘要
针对电磁场逆问题的复杂性,根据鞍点判断的理论,应用磁场数值分析和形状优化技术,探讨了开放性磁体结构的设计及优化技术,并提出了一种薄片型全开放核磁共振成像仪主磁体结构。采用了一种适用于磁体结构优化设计的混合优化算法,实现了主磁体的结构优化。计算结果表明:该算法比常规算法不仅求解质量高、适用于多变量寻优,且提高了优化算法的局部搜索能力。这种算法易于编程的实现,在一定程度上避免了设计变量配置的盲目性。
This paper presents an open permanent magnet structural design of planar magnetic resonance imaging base on the electromagnetic field numerical analysis, shape opertimization and the theory of ＂saddle point＂. The paper also introduces a hybrid optimization algorithm. The numeral results show the proposed method not only obtains satisfying results and suitability of multi-variable, but also can improve the local search ability of a certain optimization algorithms. This algorithm is easy to implement and overcome the blindness in parameter configuration in a certain degree.
出处
《北京生物医学工程》
2006年第2期126-129,共4页
Beijing Biomedical Engineering
基金
国家自然科学基金(50377027)资助
关键词
核磁共振成像仪
磁体结构
混合优化算法
magnetic resonance imaging device structure of magnet hybrid optimization algorithm
