Radiofrequency (RF) coil arrays with high count of elements, e.g., closely spaced multi-row arrays, exhibit superior parallel imaging performance in magnetic resonance imaging (MRI). However, it is technically challenging and time-consuming to build multi-row arrays due to complex coupling issues. This paper presents a novel and simple method for closely spaced multi-row RF array designs. Induced current elimination decoupling method has shown the capability of reducing coupling between microstrip elements from different rows. In this study, its capability for decoupling array elements from the same row was investigated and validated by bench tests, with an isolation improvement from −8.9 to −20.7 dB. Based on this feature, a closely spaced double-row microstrip array with 16 elements was built at 7 T. S21 between any two elements of the 16-channel closely spaced double-row microstrip array was better than −14 dB. In addition, its feasibility and performance was validated by MRI experiments. No significant image reconstruction-related noise amplifications were observed for parallel imaging even when reduced factor (R) achieves 4. The experimental results demonstrated that the proposed design might be a simple and efficient approach in fabricating closely spaced multi-row RF arrays.

中文翻译：

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用于超高场并行 MR 成像的紧密间隔双排微带射频阵列

具有大量元件的射频（RF）线圈阵列，例如紧密间隔的多行阵列，在磁共振成像（MRI）中表现出优异的并行成像性能。然而，由于复杂的耦合问题，构建多行阵列在技术上具有挑战性且耗时。本文提出了一种用于紧密间隔的多行射频阵列设计的新颖而简单的方法。感应电流消除去耦方法已显示出降低不同行微带元件之间耦合的能力。在这项研究中，通过台架测试研究并验证了其从同一行解耦阵列元件的能力，隔离度从 -8.9 分贝提高到 -20.7 分贝。基于这一特点，在 7 T 下构建了一个具有 16 个元件的紧密间隔双排微带阵列。16 通道紧密间隔的双排微带阵列的任意两个元件之间的 S21 优于 -14 dB。此外，其可行性和性能已通过 MRI 实验验证。即使当降低因子 (R) 达到 4 时，并行成像也没有观察到与图像重建相关的显着噪声放大。实验结果表明，所提出的设计可能是制造紧密间隔的多行 RF 阵列的一种简单有效的方法。