Objective: The method of pole-insertion for multi-tuning cable traps was studied for multinuclear MRI and MRS applications. Methods: Relative efficiency of the different cable trap modes was studied as component values were varied and at four different magnetic field strengths. In all cases, efficiencies were compared to equivalent single-tuned designs. Results: The multi-tuned traps were able to block shield currents at multiple frequencies with only slightly degraded efficiencies as compared to their single-tuned counterparts. As in double-tuned coil design, the cable trap effectiveness at each frequency was found to be highly dependent on the trap inductor value with larger trap inductances leading to worse efficiency at the lower frequency but better efficiency at the higher frequency. This relationship held at all field strengths examined. Conclusion: This work presents design guidelines for the double-tuning method that are useful when designing RF coils for multinuclear studies. The design takes up less space than using two single-tuned cable traps mounted in series as is commonly done. Triple-tuned and “floating” designs were also demonstrated as proofs-of-concept for a single field strength and showed great promise to prove similarly useful in future studies. Significance: For many applications such as when using high-density array coils, finding a space-efficient solution to eliminate common-mode currents could be of significant benefit. This multi-tuned approach provides space efficiency at a small cost in trapping efficiency.

中文翻译：

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用于多核 MRI 和 MRS 的多调谐电缆阱

目的：研究了用于多核 MRI 和 MRS 应用的多调谐电缆陷阱的极插入方法。方法：随着组件值的变化和四种不同的磁场强度，研究了不同电缆陷阱模式的相对效率。在所有情况下，都将效率与等效的单调谐设计进行了比较。结果：与单调谐陷阱相比，多调谐陷阱能够在多个频率下阻挡屏蔽电流，但效率仅略有下降。与双调谐线圈设计一样，发现每个频率下的电缆陷波效率高度依赖于陷波电感值，陷波电感越大，导致低频效率越差，但高频效率越高。这种关系适用于所有检查的场强。结论：这项工作提出了双调谐方法的设计指南，在设计用于多核研究的 RF 线圈时非常有用。与通常使用的串联安装的两个单调谐电缆陷阱相比，该设计占用的空间更少。三重调谐和“浮动”设计也被证明是单个场强的概念验证，并显示出在未来研究中证明同样有用的巨大希望。意义：对于许多应用，例如使用高密度阵列线圈时，找到一种节省空间的解决方案来消除共模电流可能会带来显着的好处。这种多调谐方法以较低的捕获效率成本提供了空间效率。与通常使用的串联安装的两个单调谐电缆陷阱相比，该设计占用的空间更少。三重调谐和“浮动”设计也被证明是单个场强的概念验证，并显示出在未来研究中证明同样有用的巨大希望。意义：对于许多应用，例如使用高密度阵列线圈时，找到一种节省空间的解决方案来消除共模电流可能会带来显着的好处。这种多调谐方法以较低的捕获效率成本提供了空间效率。与通常使用的串联安装的两个单调谐电缆陷阱相比，该设计占用的空间更少。三重调谐和“浮动”设计也被证明是单个场强的概念验证，并显示出在未来研究中证明同样有用的巨大希望。意义：对于许多应用，例如使用高密度阵列线圈时，找到一种节省空间的解决方案来消除共模电流可能会带来显着的好处。这种多调谐方法以较低的捕获效率成本提供了空间效率。对于许多应用，例如使用高密度阵列线圈时，找到一种节省空间的解决方案来消除共模电流可能会带来显着的好处。这种多调谐方法以较低的捕获效率成本提供了空间效率。对于许多应用，例如使用高密度阵列线圈时，找到一种节省空间的解决方案来消除共模电流可能会带来显着的好处。这种多调谐方法以较低的捕获效率成本提供了空间效率。