用于环形阵列内燃机去耦的新型谐振器几何结构。
New resonator geometries for ICE decoupling of loop arrays.
作者信息
Yan Xinqiang, Gore John C, Grissom William A
机构信息
Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA; Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA.
Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA; Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, USA; Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA.
出版信息
J Magn Reson. 2017 Apr;277:59-67. doi: 10.1016/j.jmr.2017.02.011. Epub 2017 Feb 16.
RF arrays with a large number of independent coil elements are advantageous for parallel transmission (pTx) and reception at high fields. One of the main challenges in designing RF arrays is to minimize the electromagnetic (EM) coupling between the coil elements. The induced current elimination (ICE) method, which uses additional resonator elements to cancel coils' mutual EM coupling, has proven to be a simple and efficient solution for decoupling microstrip, L/C loop, monopole and dipole arrays. However, in previous embodiments of conventional ICE decoupling, the decoupling elements acted as "magnetic-walls" with low transmit fields and consequently low MR signal near them. To solve this problem, new resonator geometries including overlapped and perpendicular decoupling loops are proposed. The new geometries were analyzed theoretically and validated in EM simulations, bench tests and MR experiments. The isolation between two closely-placed loops could be improved from about -5dB to <-45dB by using the new geometries.
具有大量独立线圈元件的射频阵列有利于在高场下进行并行发射（pTx）和接收。设计射频阵列的主要挑战之一是最小化线圈元件之间的电磁（EM）耦合。感应电流消除（ICE）方法利用额外的谐振器元件来消除线圈之间的相互电磁耦合，已被证明是一种用于解耦微带、L/C 回路、单极和偶极阵列的简单有效解决方案。然而，在传统 ICE 解耦的先前实施例中，解耦元件充当“磁壁”，其发射场较低，因此附近的磁共振信号也较低。为了解决这个问题，提出了包括重叠和解耦垂直回路在内的新谐振器几何结构。对新几何结构进行了理论分析，并在电磁模拟、台架测试和磁共振实验中得到验证。通过使用新几何结构，两个紧密放置的回路之间的隔离度可从约 -5dB 提高到 <-45dB。
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