A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna.
A nine-channel transmit/receive array for spine imaging at 10.5 T: Introduction to a nonuniform dielectric substrate antenna.
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DOI：
10.1002/mrm.29096
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发表时间：
2022-04
影响因子：
3.3
通讯作者：
Eryaman Y
中科院分区：
文献类型：
--
作者：
Sadeghi-Tarakameh A;Jungst S;Lanagan M;DelaBarre L;Wu X;Adriany G;Metzger GJ;Van de Moortele PF;Ugurbil K;Atalar E;Eryaman Y
本研究的目的是介绍一种新的天线单元，具有改善的发射性能，命名为非均匀介质基板（NODES）天线，用于建设发射阵列在超高场（UHF）。我们优化了偶极天线在10.5 T的最大化B1 +-SAR效率在人体脊柱目标的幻影。优化参数包括基板的介电常数变化、基板厚度、天线长度和导体几何形状。我们进行了电磁仿真以及幻影实验，比较发射和接收性能的建议NODES天线设计与现有的线圈元件从文献中。单个NODES元件比分离偶极子和环形元件分别高出18%和30%。该新元件比常用的偶极子短得多，这使得能够形成z堆叠阵列，并且它还能够沿其导体沿着提供相对均匀的电流分布。九通道发射/接收NODES阵列实现了7.5%的B1+均匀性比具有相同数量的元素的环形阵列。使用NODES阵列激发导致峰值10 g平均SAR（pSAR 10 g）降低33%，并且需要的输入功率比脊柱靶解剖结构的环形阵列低34%。在这项研究中，我们介绍了一种新的RF线圈元件，非均匀介质基板（NODES）天线。NODES天线优于广泛使用的环路和偶极子元件，并可为未来的UHF-MRI应用提供改进的发射和接收性能。
The purpose of this study is to introduce a new antenna element with improved transmit performance, named the non-uniform dielectric substrate (NODES) antenna, for building transmit arrays at ultra-high field (UHF). We optimized a dipole antenna at 10.5 T by maximizing the B1+-SAR efficiency in a phantom for a human spine target. The optimization parameters included permittivity variation in the substrate, substrate thickness, antenna length, and conductor geometry. We conducted EM simulations as well as phantom experiments to compare the transmit and receive performance of the proposed NODES antenna design with existing coil elements from the literature. Single NODES element showed up to 18% and 30% higher B1+-SAR efficiency than the fractionated dipole and loop elements, respectively. The new element is substantially shorter than a commonly-used dipole, which enables z-stacked array formation and it is additionally capable of providing a relatively uniform current distribution along its conductors. The nine-channel transmit/receive NODES array achieved 7.5% higher B1+- homogeneity than a loop array with the same number of elements. Excitation with the NODES array resulted in 33% lower peak 10g-averaged SAR (pSAR10g) and required 34% lower input power than the loop array for the target anatomy of the spine. In this study, we introduced a new RF coil element, the non-uniform dielectric substrate (NODES) antenna. NODES antenna outperformed the widely-used loop and dipole elements and may provide improved transmit and receive performance for future UHF-MRI applications.
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影响因子：
3.3
作者：
Erturk, M. Arcan;Wu, Xiaoping;Eryaman, Yigitcan;Van de Moortele, Pierre-Francois;Auerbach, Edward J.;Lagore, Russell L.;DelaBarre, Lance;Vaughan, J. Thomas;Ugurbil, Kamil;Adriany, Gregor;Metzger, Gregory J.
通讯作者：
Metzger, Gregory J.
影响因子：
3.3
作者：
Kuroda, K;Oshio, K;Jolesz, FA
通讯作者：
Jolesz, FA
影响因子：
5.7
作者：
De Martino, Federico;Yacoub, Essa;Formisano, Elia
通讯作者：
Formisano, Elia
影响因子：
3.3
作者：
Adriany, G;Van de Moortele, PF;Ugurbil, K
通讯作者：
Ugurbil, K
影响因子：
3.3
作者：
Brink, Wyger M.;Remis, Rob F.;Webb, Andrew G.
通讯作者：
Webb, Andrew G.