永磁开放式MR系统中梯度线圈性能参数优化方案

Optimized scheme of performance parameters of gradient coils for permanent magnetic open architecture MR system

针对MRI系统中梯度线圈对图像质量和高端应用领域要求的直接决定因素,在对梯度线圈性能指标优化理论的基础上,构建了通过Matlab实现反演计算、Ansoft模拟仿真电磁场分布,设计永磁开放式平板梯度线圈(x、y、z)几何结构、电感等参数,以满足梯度场强度、梯度线性度、切换率、梯度电感等梯度线圈性能参数系统优化方案和参数检测平台。实验结果表明此方案具有一定的工程实用价值。

In view of MRI gradient coils is one the directly determining factors of imaging quality and high-end application field requirements.Based on optimization theory about gradient coils performance index,construction of the optimized scheme of magnetic resonance gradient coils performance parameters and performance index testing platform was performed,including back-stepping design by Matlab and the simulation of electromagnetic field distribution with Ansoft,and the design of geometric structure and electric inductance,etc.,as well as performance parameters for permanent magnetism open architecture plate gradient coils（x,y,z）,in order to satisfy with gradient field intensity,functionally gradient linearity,slew rate,gradient variation of inductance,etc.,as well as performance parameters for gradient coils.Experiment results showed that the scheme has some practical value in engineering.