磁共振系统梯度线圈拓扑构型的创新设计方法研究

项目名称： 磁共振系统梯度线圈拓扑构型的创新设计方法研究

项目编号： No.51275504

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 刘震宇

作者单位： 中国科学院长春光学精密机械与物理研究所

项目金额： 82万元

中文摘要： 为促进磁共振成像技术在我国医疗诊断、生命健康等方面的应用和普及，本项目以磁共振成像系统中关键部件梯度线圈的设计为研究目标，在充分比较和分析现有设计方法优点和不足的基础上，突破传统设计方法对于梯度线圈构型的局限性，通过采用基于多物理场的多目标优化模型、耦合迭代优化算法，探讨一种创新性非缠绕式拓扑构型的梯度线圈设计方法。在申请人参加德国联邦教育研究部项目"非传统高主磁场梯度线圈设计制造"的前期研究工作基础上，综合考虑目前梯度线圈在使用中所遇到的共性问题，将设计目标定位于同时优化线圈振动变形和噪声、温度场分布、以及梯度磁场的均匀性和切换频率，以达到在非规则分片连续曲面上设计具有矫正和屏蔽功能的多层集成式梯度线圈。该项研究涉及机-电-热-磁多学科交叉、多物理场耦合的梯度线圈创新性设计方法研究，对于提高现有磁共振成像系统在安全性、经济性等方面的研究具有一定的促进作用。

中文关键词： 磁共振成像；梯度线圈；多物理场耦合；多目标优化；可展设计曲面

英文摘要： This project aims to design novel gradient coils for magnetic resonance image (MRI) applications, which are especially useful in neurological, cardiovascular, and oncological imaging. The design of gradient coils for MRI is an optimization problem, and the most commonly method is the so-called stream function method. Typically, the layout of coils is constructed based on the contour lines of the stream function surface. This design methodology limits the design novelty where the balance of multiple design necessities, such as the homogeneous magnetic field, low value of inductance and fast switching time, low eddy current, weak vibration and noise, etc, need to be considered simultaneously. Based on our previously BMBF INUMAC projects with German university and industry, this application inventively proposes a design idea which can optimize non-spiral winding type topology of coils. Based on the multiphysical and multidisciplinary optimization theories, the multiple design objectives will be considered in order to obtain novel multiple-layer gradient coils with improved vibration,thermal and magnetic performances. Hopefully, the design methodology proposed in this project could promote design capability for China MRI facilities.

英文关键词： magnetic resonance image；gradient coil；multiple physical coupling；multidiscipline optimization；developable design surface