Parallel traveling-wave MRI: a feasibility study.
Parallel traveling-wave MRI: a feasibility study.
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DOI：
10.1002/mrm.23073
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发表时间：
2012-04
影响因子：
3.3
通讯作者：
Zhang, Xiaoliang
中科院分区：
文献类型：
--
作者：
Pang, Yong;Vigneron, Daniel B.;Zhang, Xiaoliang
行波 MRI 利用磁体孔中的单片贴片天线的远场来产生射频场，用于对大尺寸样本（例如人体）进行成像。本文通过数值分析和实验测试，研究了微带贴片天线阵列将“行波”技术应用于并行成像的可行性。建立了特定的贴片阵列模型，每个阵元都是微带贴片天线。台架测试表明，两个相邻元件之间的去耦优于-26dB，而每个元件的匹配达到-36dB，表现出优异的隔离性能和阻抗匹配能力。针对空载和负载情况模拟灵敏度模式并计算 g 因子。 B1− 灵敏度模式和 g 因子的结果证明了行波并行成像的可行性。模拟还表明，不同的阵列配置（例如贴片形状、位置和方向）会导致不同的灵敏度模式和 g 因子图，这提供了一种操纵 B1 场并提高并行成像性能的方法。该方法还通过 7T MR 成像实验进行了验证。
Traveling-wave MRI utilizes far fields of a single-piece patch antenna in the magnet bore to generate RF fields for imaging large-size samples, such as the human body. In this work, the feasibility of applying the “traveling-wave” technique to parallel imaging is studied using microstrip patch antenna arrays with both the numerical analysis and experimental tests. A specific patch array model is built and each array element is a microstrip patch antenna. Bench tests show that decoupling between two adjacent elements is better than -26-dB while matching of each element reaches -36-dB, demonstrating excellent isolation performance and impedance match capability. The sensitivity patterns are simulated and g-factors are calculated for both unloaded and loaded cases. The results on B1− sensitivity patterns and g-factors demonstrate the feasibility of the traveling-wave parallel imaging. Simulations also suggest that different array configuration such as patch shape, position and orientation leads to different sensitivity patterns and g-factor maps, which provides a way to manipulate B1 fields and improve the parallel imaging performance. The proposed method is also validated by using 7T MR imaging experiments.
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