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本文发展了开放式自屏蔽全身成像高场超导磁共振成像(MRI)磁体的优化设计方法,使设计出来的磁体仅有4对超导线圈.这种开放结构的超导MRI磁体优化设计方法集成了线性规划算法和遗传算法.通过迭代线性规划算法可以在考虑成像区域(DSV)磁感应强度约束、磁场不均匀度约束、5 Gs线范围约束、线圈区域最大磁场值约束和最大环向应力约束的条件下,获得用线量最少的线圈初始形状和位置,同时可以得到每个线圈的层数和每层匝数;通过遗传算法可以提高DSV区域的磁场不均匀度,以达到高质量成像的要求.这种集成的优化设计方法既可以灵活有效的设计开放式MRI磁体,也可以设计传统的圆柱形MRI磁体,本文通过一个1.2 T的开放式MRI磁体的设计清楚的展示了这种优化方法.
In this paper, an optimized design method of an open self-shielded whole-body imaging HTS MRI magnet has been developed to make the designed magnet have only four pairs of superconducting coils.This open structure superconducting MRI magnet optimization design method The linear programming algorithm and the genetic algorithm are integrated, and the iterative linear programming algorithm can take into account the magnetic induction intensity constraints, the magnetic field non-uniformity constraints, the 5 Gs line range constraints, the maximum magnetic field value constraints and the maximum circumferential stress constraints in the imaging region (DSV) , The initial shape and position of the coil with the least amount of wires can be obtained. At the same time, the number of layers per coil and the number of turns per layer can be obtained. The genetic algorithm can improve the magnetic field nonuniformity in the DSV region to achieve high quality imaging This integrated optimization approach allows both flexible and efficient design of open MRI magnets as well as the design of traditional cylindrical MRI magnets. This optimization approach is clearly demonstrated by the design of a 1.2 T open MRI magnet .