School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
J Magn Reson. 2013 Jan;226:70-8. doi: 10.1016/j.jmr.2012.11.017. Epub 2012 Nov 29.
MRI can be combined with other systems, such as linear accelerators (LINACs) to provide image-guided therapy. However, in some configurations this requires splitting the MRI scanner to provide a central gap large enough to ensure dual access for the accelerator and the patient. This raises technical difficulties for maintaining a high gradient coil performance. In this research, a dedicated split transverse gradient coil was designed with a flange connected to the central coil end, which provided an additional surface for the current to flow. The coil was compared to existing designs, in terms of coil performance and eddy current effects. It was found that a flanged-edge coil design produced a better coil performance and more moderate eddy currents than those of the other designs. It is hoped that this study will help to inform the design of optimal gradient coils for split MRI systems with a large central gap.
MRI 可以与其他系统（如线性加速器（LINACs））结合使用，以提供图像引导治疗。然而，在某些配置中，这需要将 MRI 扫描仪分割开，以提供足够大的中央间隙，以确保加速器和患者能够双重进入。这给维持高梯度线圈性能带来了技术上的困难。在这项研究中，设计了一个专用的分体横向梯度线圈，带有一个连接到中央线圈末端的凸缘，为电流提供了一个额外的流动表面。该线圈在性能和涡流效应方面与现有设计进行了比较。结果表明，凸缘边缘线圈设计产生的线圈性能更好，涡流比其他设计更温和。希望这项研究将有助于为具有较大中央间隙的分体 MRI 系统的最佳梯度线圈设计提供信息。
