9.4 T double-tuned 13C/1H human head array using a combination of surface loops and dipole antennas,NMR in Biomedicine

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9.4 T double-tuned 13C/1H human head array using a combination of surface loops and dipole antennas
NMR in Biomedicine ( IF 2.7 ) Pub Date : 2021-06-24 , DOI: 10.1002/nbm.4577
Nikolai I Avdievich ₁ , Georgiy Solomakha ₂ , Loreen Ruhm ₁ , Anke Henning _{1,

3} , Klaus Scheffler _{1,

4}

Affiliation

MRI at ultra-high field (UHF, ≥7 T) provides a natural strategy for improving the quality of X-nucleus magnetic resonance spectroscopy and imaging due to the intrinsic benefit of increased signal-to-noise ratio. Considering that RF coils require both local transmission and reception at UHF, the designs of double-tuned coils, which often consist of several layers of transmit and receive resonant elements, become quite complex. A few years ago, a new type of RF coil, ie a dipole antenna, was developed and used for human body and head imaging at UHF. Due to the mechanical and electrical simplicity of dipole antennas, combining an X-nucleus surface loop array with ¹H dipoles can substantially simplify the design of a double-tuned UHF human head array coil. Recently, we developed a novel bent folded-end dipole transceiver array for human head imaging at 9.4 T. The new eight-element dipole array demonstrated full brain coverage, and transmit efficiency comparable to that of the substantially more complex 16-element surface loop array. In this work, we developed, constructed and evaluated a double-tuned ¹³C/¹H human head 9.4 T array consisting of eight ¹³C transceiver surface loops and eight ¹H transceiver bent folded-end dipole antennas all placed in a single layer. We showed that interaction between loops and dipoles can be minimized by placing four ¹H traps into each ¹³C loop. The presented double-tuned RF array coil substantially simplifies the design as compared with the common double-tuned surface loop arrays. At the same time, the coil demonstrated an improved ¹H longitudinal coverage and good transmit efficiency.

中文翻译：

9.4T双调谐13C/1H人头阵列，使用表面环和偶极天线的组合

由于信噪比增加的内在优势，超高场（UHF，≥7 T）的 MRI 为提高 X 核磁共振波谱和成像质量提供了一种自然策略。考虑到射频线圈需要在 UHF 下进行本地传输和接收，双调谐线圈的设计（通常由几层发射和接收谐振元件组成）变得相当复杂。几年前，一种新型的射频线圈，即偶极天线被开发出来，用于超高频的人体和头部成像。由于偶极天线的机械和电气简单性，将 X 核表面环形阵列与¹H 偶极子可以大大简化双调谐 UHF 人体头部阵列线圈的设计。最近，我们开发了一种新型弯曲折叠端偶极子收发器阵列，用于在 9.4 T 下进行人体头部成像。新的八元偶极子阵列展示了全脑覆盖，并且传输效率与复杂得多的 16 元表面环形阵列相当. 在这项工作中，我们开发、构建和评估了一个双调谐¹³ C/ ¹ H 人头 9.4 T 阵列，该阵列由八个¹³ C 收发器表面环和八个¹ H 收发器弯曲折叠端偶极子天线组成，所有这些天线都放置在单层中。我们表明，可以通过在每个陷阱中放置四个¹ H 陷阱来最小化环和偶极子之间的相互作用¹³ C 循环。与常见的双调谐表面环路阵列相比，所提出的双调谐射频阵列线圈大大简化了设计。同时，该线圈表现出改进的¹ H纵向覆盖和良好的传输效率。

更新日期：2021-06-24

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