Quadrature transmit array design using single-feed circularly polarized patch antenna for parallel transmission in MR imaging.
Quadrature transmit array design using single-feed circularly polarized patch antenna for parallel transmission in MR imaging.
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DOI：
10.3978/j.issn.2223-4292.2014.02.03
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发表时间：
2014-05
影响因子：
2.8
通讯作者：
Y. Pang;Baiying Yu;D. Vigneron;Xiaoliang Zhang
中科院分区：
文献类型：
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作者：
Y. Pang;Baiying Yu;D. Vigneron;Xiaoliang Zhang
在MR应用中通常需要正交线圈，因为它们可以提高MR灵敏度并且还可以降低激励功率。在这项工作中，我们提出了，第一次，在298 MHz的并行传输使用单馈圆极化（CP）贴片天线技术的正交阵列设计策略。每个阵元是一个近似正方形的环形微带天线，并在天线对角线上的一个点处馈电，以产生正交磁场。与传统的正交线圈相比，单馈结构简单、紧凑，使得正交线圈阵列设计具有实用性。数值模拟表明，对于所有元件，元件之间的去耦优于-35dB，并且射频场是均匀的，在感兴趣区域具有深穿透和正交行为。Bloch方程模拟也进行了模拟的激励过程中，通过使用一个8元正交平面贴片阵列，以证明其在并行传输的可行性，在7特斯拉的最大磁场。
Quadrature coils are often desired in MR applications because they can improve MR sensitivity and also reduce excitation power. In this work, we propose, for the first time, a quadrature array design strategy for parallel transmission at 298 MHz using single-feed circularly polarized (CP) patch antenna technique. Each array element is a nearly square ring microstrip antenna and is fed at a point on the diagonal of the antenna to generate quadrature magnetic fields. Compared with conventional quadrature coils, the single-feed structure is much simple and compact, making the quadrature coil array design practical. Numerical simulations demonstrate that the decoupling between elements is better than -35 dB for all the elements and the RF fields are homogeneous with deep penetration and quadrature behavior in the area of interest. Bloch equation simulation is also performed to simulate the excitation procedure by using an 8-element quadrature planar patch array to demonstrate its feasibility in parallel transmission at the ultrahigh field of 7 Tesla.