EBG structure to improve the B1 efficiency of stripline coil for 7 Tesla MRI
EBG structure to improve the B1 efficiency of stripline coil for 7 Tesla MRI
复制标题
EBG结构提高7特斯拉MRI带状线线圈的B1效率
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Rennings
中科院分区：
文献类型：
--
作者：
G. Saleh;K. Solbach;A. Rennings
本文提出了 EBG 结构的首次应用，以提高用于 7 特斯拉磁共振成像 (MRI) 的带状线线圈的 B1 效率。所提出的偏移多层电磁带隙（EBG）结构被用作扩展半波长（曲折）偶极子后面的高阻抗表面。它的工作频率为 300MHz，磁共振频率为 7T，由仅为自由空间波长 7.5% 的电气小单元组成。利用反射相位系数和色散图来表征EBG结构。由我们的 EBG 结构支持的 MRI 带状线线圈成功地在体模内展现了比使用金属导体 (PEC) 接地层作为线圈的原始设计更强的 B1 场。 B1效率的定量提升达47%。
This paper presents the first application of an EBG structure to improve the B1 efficiency of strip-line coils used for 7-Tesla Magnetic Resonance Imaging (MRI). The proposed offset multilayer electromagnetic band gap (EBG) structure is utilized as a high impedance surface behind an extended half-wavelength (meandered) dipole. It operates at 300MHz, the magnetic resonance frequency at 7 T, and comprises of electrically small cells of only 7.5% of the free-space wavelength. The reflection phase coefficient and the dispersion diagram were used to characterize the EBG structure. The MRI strip-line coil backed by our EBG structure is successful in exhibiting a stronger B1-field inside a phantom than the original design using a metallic conductor (PEC) ground plane for the coil. The quantitative improvement in B1 efficiency amounts to 47%.