Brey W W, Mareci T H, Dougherty J
Center for Structural Biology, University of Florida, Gainesville, Florida, 32610-0245, USA.
J Magn Reson B. 1996 Aug;112(2):124-30. doi: 10.1006/jmrb.1996.0122.
An approach to transverse field-gradient coil design is presented which locates all current elements in planes perpendicular to the main magnetic field. The linear volume of the resulting coil structure can be made to extend nearly to both ends of the coil. This design is based on forming a concentric return path in the same plane as the field-producing arcs. The coil structure consists of stacked planar units which give a desired field-gradient configuration. The size of the linear-field region is optimized by varying the current in each plane, by varying the location of a plane relative to the others in the stack, or by varying both current and location. Coils with linear regions having a wide range of length-to-diameter ratios can be designed, as illustrated by two examples. The construction of a prototype coil is presented and its performance in imaging confirms the analysis. This type of design is suited to magnetic resonance of the human head without obstruction from the shoulders.
本文提出了一种横向场梯度线圈的设计方法，该方法将所有电流元件置于垂直于主磁场的平面内。由此产生的线圈结构的线性体积可以延伸至几乎接近线圈的两端。这种设计基于在与产生磁场的弧形相同的平面内形成同心返回路径。线圈结构由堆叠的平面单元组成，这些单元可提供所需的场梯度配置。通过改变每个平面中的电流、改变一个平面相对于堆叠中其他平面的位置或同时改变电流和位置，可以优化线性场区域的大小。如两个示例所示，可以设计出具有广泛长径比的线性区域的线圈。文中介绍了一个原型线圈的构造，其成像性能证实了分析结果。这种类型的设计适用于人体头部的磁共振成像，且不会受到肩部的阻碍。
