物理学报2013，Vol.62Issue(2)：171-177,7.DOI:10.7498/aps.62.020701
短腔、自屏蔽磁共振成像超导磁体系统的混合优化设计方法
A hybrid optimization approach to design of compact self-shielded super conducting magnetic resonance imaging magnet system
摘要
Abstract
A hybrid optimization approach with a combination of linear programming and nonlinear programming algorithm for designing a compact self-shielded magnetic resonance imaging (MRI) superconducting magnet system is presented. The designed coils possess advantages of low construction costs, simple coil structure and the maximum magnetic strength within coils, current margin and electromagnetic stress easy to control. Firstly, in the stage of linear programming optimization, the feasible rectangular region can be divided into two-dimensional meshes, and a current map is calculated for meeting the magnetic field constraints over the surfaces of DSV sphere and 5 gauss stray field ellipse; Secondly, the current map has many nonzero current clusters and each cluster can be discretized into a solenoid. A nonlinear programming algorithm is employed to optimize the positions of all solenoids for minimizing the total coil volume and meeting all constraints including magnetic field which is the same as linear programming stage, and maximum magnetic strength, current margin and the gap between neighborhood inner coils. A 1.5 T compact self-shielded MRI superconducting magnet system is studied, the total coil length is only 1.32 m and the peak-peak homogeneity over 50 cm DSV is 10 ppm. The design approach is flexible and efficient for designing symmetrical and asymmetrical horizontal MRI and also open bi-planar MRI system.关键词
自屏蔽/磁共振成像/混合方法/数值优化Key words
self-shielded/ MRI/ hybrid optimization/ numerical method引用本文复制引用
倪志鹏,王秋良,严陆光..短腔、自屏蔽磁共振成像超导磁体系统的混合优化设计方法[J].物理学报,2013,62(2):171-177,7.
