IEEE Trans Biomed Eng. 2019 Dec;66(12):3339-3345. doi: 10.1109/TBME.2019.2904213. Epub 2019 Mar 11.
The head gradient coil is advantageous for brain imaging compared to the conventional whole-body gradient coil. It is usually asymmetrically designed for the accommodation of human shoulders. The asymmetric head coil has a specific issue associated with an unbalanced force/torque that requires minimization for imaging applications. This paper will improve the force and torque balance solution and propose a dichotomization winding scheme to augment the coil slew rate. A square force and torque optimization enables the available balanced asymmetric head gradient coil design, with a force and torque approaching the minimum level. Subsequently, two practical parallel connection winding schemes were quantitatively analyzed and evaluated. The results show that the proposed dichotomization winding scheme can increase the slew rate to almost twice that of the conventional winding counterpart, without obviously influencing the magnetic field performance.
与传统的全身梯度线圈相比，头部梯度线圈在脑部成像方面具有优势。它通常为适应人体肩部而设计为非对称形状。非对称头部线圈存在与不平衡力/力矩相关的特定问题，这在成像应用中需要最小化。本文将改进力和力矩平衡解决方案，并提出二分绕组方案来提高线圈的上升速率。通过平方力和力矩优化，可实现可用的平衡非对称头部梯度线圈设计，使力和力矩接近最小水平。随后，对两种实用的并行连接绕组方案进行了定量分析和评估。结果表明，所提出的二分绕组方案可以将上升速率提高到几乎是传统绕组方案的两倍，而不会明显影响磁场性能。
