短腔自屏蔽核磁共振成像超导磁体的设计  

SHORT ACTIVELY SHIELDED SUPERCONDUCTIONG MAGNET DESIGN FOR MRI

作　　者：许国兴[1] 王秋良[1] 

机构地区：[1]中国科学院电工研究所

出　　处：《低温物理学报》2008年第1期74-78,共5页Low Temperature Physical Letters

摘　　要：本文提出了一种短腔自屏蔽核磁共振成像(MRI)超导磁体的设计方法.先将矩形截面螺线管线圈简化成截面为一个点的电流环,得到一个线性规划模型,采用线性规划的方法得到合适的线圈位置和电流大小,然后再利用遗传算法对线圈的截面形状进行优化,得到合适的线圈截面尺寸.线性规划的引入,减少了优化变量,降低了优化规模,结合遗传算法,使得短腔自屏蔽MRI超导磁体设计变得简单易行.文章最后给出了一个设计算例.An optimization design method of short actively shielded superconducting MRI magnet is reported in this paper. Firstly, the section of the solenoid coil is simplified as a current loop with zero section in order to get a linear programming problem. And the coils＇ position and current can be calculated by using linear programming method. Then the section of the coil is optimized with genetic algorithm to get appropriate section size. The method of linear programming, especially combining with genetic algorithm, reduces optimizing variables, which makes the design of magnet feasible.

关 键 词：磁共振成像 磁体设计 线性规划 遗传算法 

分 类 号：O511[理学—低温物理]