Novel gradient coils designed using a boundary element method
Novel gradient coils designed using a boundary element method
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DOI：
10.1002/cmr.b.20091
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发表时间：
2007-08-01
影响因子：
0.9
通讯作者：
Bowtell, Richard
中科院分区：
文献类型：
--
作者：
Poole, Michael;Bowtell, Richard
边界元法为梯度线圈的设计提供了一种强有力的方法，它允许在任意形状的表面上产生线圈缠绕，从而产生与麦克斯韦方程一致的任何形式的保持变化。这些方法基于将载流表面网格化为边界元素阵列。在这项工作中，我们已经扩展了边界元方法，以前用于线圈设计和集成了一个强大的网格生成程序，以便产生线圈与完全任意的几何形状。四个例子被用来说明如何修改的方法提供了一个单一的通用线圈设计协议。这些涉及以下设计：i）具有高度不对称表面几何形状的屏蔽头部梯度，其给出最高可能的梯度保持强度; ii）非常短的屏蔽梯度线圈，以允许改善对受试者的接近; iii）双平面线圈，其产生高度不对称的阶梯式磁场，用于通过使用微B-0阵列（MAMBA）的多次采集进行快速成像; iv）具有肩部切口的头部梯度线圈的可插入组。(c)2007 Wiley Periodicals，Inc.
Boundary element methods offer a powerful approach for designing gradient coils, allowing the generation of coils wounds on arbitrarily shaped surface so as to produce any form of held variation that is consistent with Maxwell's equations. These methods are based on meshing the current carrying surface into an array of boundary elements. in this work, we have extended boundary element methods that have previously been used used for coil design and integrated a powerful mesh generating program so as to produce coils with totally arbitrary geometry. Four examples are used to illustrate how the modified method provides a single versatile coil design protocol. These relate to the design of: i) shielded head gradients with highly asymmetric surface geometry that give the highest possible gradient held strengths; ii) very short, shielded gradient coils to allow improved access to the subject; iii) bi-planar coils generating highly asymmetric, stepped magnetic fields for use in fast imaging by multiple acquisition with micro-B-0 arrays (MAMBA); iv) an insertable set of head gradient coils with shoulder cutouts. (c) 2007 Wiley Periodicals, Inc.