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横向梯度线圈的设计方法基于非均的理性B-spline (NURBS) 曲线

Chenxi Zhu^1,2, Weiran Song¹, Lifei Liu¹

¹Zepp Health, Hefei, Anhui, China.

Magnetic resonance in medicine

|October 25, 2024

概括

这项研究引入了一种新的混合方法,用于设计磁共振成像梯度线圈,将电流密度和NURBS曲线结合起来,以提高性能和可制造性. 该方法优化了线圈线性和效率,同时管理了线程间距和复杂的设计约束.

科学领域:

医学成像物理医学成像物理
线圈设计工程线圈设计工程
计算电磁学计算机电磁学

背景情况:

梯度线圈是磁共振成像 (MRI) 系统中必不可少的组件,负责空间编码.
优化梯度线圈设计对于提高图像质量,减少扫描时间和提高患者安全至关重要.
现有的设计方法在平衡性能指标与制造可行性方面经常面临挑战.

研究的目的:

提出一种混合梯度线圈设计方法,将基于当前密度的技术与非均的理性B-spline (NURBS) 曲线相结合.
为了优化横向梯度线圈的性能和可制造性.
开发一种灵活的设计方法,能够应对复杂的约束和特定的应用要求.

主要方法:

使用基于密度的方法生成初始电线配置.
不统一的合理B-spline (NURBS) 曲线适用于配置,控制参数调整以满足性能目标.
使用一个客观函数,其中包含一个sigmoid函数用于电线间距,以及对梯度效率,线性,流和扭矩的约束.
由于NURBS曲线的断片性质,可以独立控制特定的线圈段.

主要成果:

该方法通过设计三个屏蔽横向梯度线圈 (全身,超短全身和超短不对称头线圈) 来验证.
优化的线圈在大型球体体积 (DSV) 中表现出显著的线性,同时保持平衡的梯度效率,流和扭矩.
目标功能成功地管理了电线度,以实现高线性,确保均分布和适当的间距.
通过NURBS曲线的灵活性,可以定制线路以防止干扰,被动闪,并适应连接和冷却.

结论:

拟议的混合方法为设计高性能梯度线圈提供了一种多功能和有效的方法.
这种技术通过优化线材放置和管理复杂的设计考虑来提高制造能力.
该方法为先进的MRI应用中未来的梯度线圈开发提供了强大的框架.

关键词:

只有头部的梯度线圈.非统一的理性B-spline (NURBS) 线横向梯度线圈的设计超短的梯度线圈超短的梯度线圈

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