基于改进遗传算法的核磁共振成像主磁体形状优化

Pole shape optimization of NMR imaging magnet based on improved genetic algorithm

针对核磁共振(NMR)成像永磁型主磁体极靴的形状优化问题,应用磁场数值分析和形状优化的理论和方法,探讨了大空间内磁场均匀的技术.以改进的遗传算法作为优化设计中搜索最优方案的工具,达到了在较大空间内磁场相对均匀的目的.

The pole shape optimization of the NMR imaging permanent magnets is presented in order to improve the homogeneity of the magnetic field in a large imaging volume between the poles. During the course of studying, numerical method of magnetic field computation and the theory of shape optimization are applied. Based on the improved Genetic Algorithms, the most excellent structure of the pole shape is designed and relatively uniform magnetic field in a large imaging volume is abtained.