This article introduces two new designs of transmit/receive switches for 7-Tesla magnetic resonance imaging. Both designs based on a microstripline coupler technology. In the first design, a different single frequency signals can be handled to/from a radio frequency coil using smart tuning network. In the second design, a dual-tuned 1H/23Na transmit/receive switch is designed to handle a dual resonant signal to a dual resonant 1H/23Na coil, simultaneously and without tuning. In transmit and receive, the first design achieved good matching (-20 dB), and low insertion loss (0.78 dB) for the 1H, 19F, 31P, 13C, and 23Na magnetic resonance signals with high isolation (61 dB). Similarly, the dual-tuned 1H/23Na switch achieved good matching (<−11.5 dB) and low insertion loss (1.0 dB) with high isolation (67 dB), whereas for 1H/31P switch, good matching has been achieved (<−12 dB) and low insertion loss (0.96 dB) with high isolation (62 dB). The first proposed switch enables the use of the same switch with different coils resonating at Larmor frequencies of different atomic nuclei. The second switch can handle a dual resonant signal to a single dual resonant coil. The first design is promising in reducing the costs by using the same switch with different coils. The second design is promising in the integration with multichannel dual resonant coil.

中文翻译：

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用于 7 特斯拉磁共振成像的多调谐和双调谐微带线发射/接收开关

本文介绍了两种用于 7 特斯拉磁共振成像的发射/接收开关的新设计。两种设计都基于微带线耦合器技术。在第一个设计中，可以使用智能调谐网络处理传入/传出射频线圈的不同单频信号。在第二个设计中，双调谐 1H/23Na 发射/接收开关设计用于处理双谐振 1H/23Na 线圈的双谐振信号，同时无需调谐。在发射和接收方面，第一个设计对 1H、19F、31P、13C 和 23Na 磁共振信号实现了良好的匹配（-20 dB）和低插入损耗（0.78 dB），具有高隔离度（61 dB）。同样，双调谐 1H/23Na 开关实现了良好的匹配 (<−11.5 dB) 和低插入损耗 (1.0 dB) 以及高隔离度 (67 dB)，而对于 1H/31P 开关，实现了良好的匹配 (<−12 dB) 和低插入损耗 (0.96 dB) 和高隔离度 (62 dB)。第一个提出的开关能够使用具有不同线圈的相同开关，该线圈以不同原子核的拉莫尔频率共振。第二个开关可以将双谐振信号处理到单个双谐振线圈。第一种设计有望通过使用具有不同线圈的相同开关来降低成本。第二种设计在与多通道双谐振线圈的集成方面很有前景。第一种设计有望通过使用具有不同线圈的相同开关来降低成本。第二种设计在与多通道双谐振线圈的集成方面很有前景。第一种设计有望通过使用具有不同线圈的相同开关来降低成本。第二种设计在与多通道双谐振线圈的集成方面很有前景。