优化绝缘耦合元件距离以改进用于7特斯拉磁共振成像的单极天线阵列。
Optimizing the ICE decoupling element distance to improve monopole antenna arrays for 7 Tesla MRI.
作者信息
Yan Xinqiang, Zhang Xiaoliang, Xue Rong, Gore John C, Grissom William A
机构信息
Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN, USA; Department of Radiology, Vanderbilt University, Nashville, TN, USA.
Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA; UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, USA.
出版信息
Magn Reson Imaging. 2016 Nov;34(9):1264-1268. doi: 10.1016/j.mri.2016.07.008. Epub 2016 Jul 25.
The induced current elimination (ICE) method has been previously applied to decouple monopole coil arrays in ultrahigh field MRI. However, the method creates low B spots near the decoupling elements. In this study, we aim to improve the performance of ICE-decoupled monopole array in human head imaging at 7 Tesla. Eight-channel ICE-decoupled monopole arrays were optimized by varying the position of the decoupling elements. A series of numerical studies were performed using the co-simulation method. In simulation, decoupling performance, quality (Q-) values and transmit field (B) were comparatively investigated. In addition, we constructed an optimized ICE-decoupled monopole array and compared its performance with the unoptimized array. The simulation results showed that a good trade-off between decoupling and B loss can be obtained when decoupling elements were moved 2.5-cm away from coil elements. This was validated by in-vivo MR imaging using the constructed array. Compared with the unoptimized ICE decoupled monopole array, the optimized array had a more homogeneous transmit field and no dark spots or signal cancellations in the MR images.
感应电流消除（ICE）方法先前已应用于超高场磁共振成像（MRI）中对单极线圈阵列进行去耦。然而，该方法在去耦元件附近会产生低B点。在本研究中，我们旨在提高7特斯拉人体头部成像中ICE去耦单极阵列的性能。通过改变去耦元件的位置对八通道ICE去耦单极阵列进行了优化。使用联合仿真方法进行了一系列数值研究。在仿真中，对去耦性能、品质（Q-）值和发射场（B）进行了比较研究。此外，我们构建了一个优化的ICE去耦单极阵列，并将其性能与未优化的阵列进行了比较。仿真结果表明，当去耦元件从线圈元件移开2.5厘米时，可以在去耦和B损失之间获得良好的权衡。这通过使用构建的阵列进行的体内MR成像得到了验证。与未优化的ICE去耦单极阵列相比，优化后的阵列具有更均匀的发射场，并且在MR图像中没有暗点或信号抵消。
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