用于超高场磁共振成像中偶极天线阵列的去耦与匹配网络
Decoupling and matching network for monopole antenna arrays in ultrahigh field MRI.
作者信息
Yan Xinqiang, Zhang Xiaoliang
机构信息
1 Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China ; 2 Beijing Engineering Research Center of Radiographic Techniques and Equipment, Beijing 100049, China ; 3 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, USA ; 4 UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, California, USA.
出版信息
Quant Imaging Med Surg. 2015 Aug;5(4):546-51. doi: 10.3978/j.issn.2223-4292.2015.07.06.
BACKGROUND
Radiative coil arrays, e.g., dipole or monopole arrays, are increasingly used in MR signal excitation and reception for ultrahigh field MRI. Technically, it is challenging to suppress the electromagnetic (EM) coupling of radiative array elements due to their unique structures.
METHODS
In this study, we proposed a combined decoupling and matching network (DMN) for monopole arrays for MRI applications. Compared with separate decoupling network and matching network, the combined network proposed here needs less components and rather suitable for decoupling radiative arrays in MRI.
RESULTS
Our study shows that the transmission coefficient between two coupled monopoles can be reduced from -5 dB to -24.8 dB by using the combined DMN. It is also clearly demonstrated in this study that this decoupling method is a port decoupling method rather than an element decoupling method.
CONCLUSIONS
With the proposed DMN, the monopole coil provides locally strong and spatially diverse B1 fields, which is essential to the improvement of MR sensitivity and parallel imaging performance.
背景
辐射线圈阵列，例如偶极子或单极子阵列，越来越多地用于超高场磁共振成像（MRI）的磁共振信号激发和接收。从技术上讲，由于辐射阵列元件的独特结构，抑制其电磁（EM）耦合具有挑战性。
方法
在本研究中，我们提出了一种用于MRI应用的单极子阵列的组合去耦匹配网络（DMN）。与单独的去耦网络和匹配网络相比，这里提出的组合网络所需组件更少，更适合于MRI中辐射阵列的去耦。
结果
我们的研究表明，通过使用组合DMN，两个耦合单极子之间的传输系数可以从-5 dB降低到-24.8 dB。本研究还清楚地表明，这种去耦方法是一种端口去耦方法，而不是元件去耦方法。
结论
通过所提出的DMN，单极子线圈提供局部强且空间多样的B1场，这对于提高MR灵敏度和平行成像性能至关重要。
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