A capacitive impedance metasurface combined with a transceiver coil to improve the radio frequency magnetic field for 1.5T magnetic resonance imaging applications is presented. The novel transceiver provides localized enhancement in magnetic flux density when compared to a transceiver coil alone by incorporating an electrically small metasurface using an interdigital capacitance approach. Full field simulations employing the metasurface show a significant improvement in magnetic flux density inside a homogeneous dielectric phantom, which is also shown to perform well for a range of depths into the phantom. The concept was experimentally demonstrated through vector network analyzer measurements and images have been taken using a 1.5T MRI scanner. The results show there is a 216% improvement in transmission efficiency, a 133% improvement in receiver signal-to-noise-ratio (SNR), and a 415% improvement in transceiver SNR for a particular transmission power when compared against a surface coil positioned at the same distance from the phantom, where these improvements are the maximum observed during experiments.

中文翻译：

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在1.5T应用中采用超颖表面的磁共振成像表面线圈收发器。

提出了与收发器线圈结合的电容性阻抗超表面，以改善1.5T磁共振成像应用中的射频磁场。与单独的收发器线圈相比，该新型收发器通过使用叉指电容方法合并一个小的电超表面，从而提供了磁通密度的局部增强。使用超颖表面的全场模拟表明，均匀介电体模内部的磁通密度有了显着提高，这在模体深度范围内也表现良好。该概念已通过矢量网络分析仪测量得到了实验证明，并且已使用1.5T MRI扫描仪拍摄了图像。结果表明，传输效率提高了216％，