Transmit/receive L/C loop arrays with the induced current elimination (ICE) or magnetic wall decoupling method have shown high signal-to-noise ratio (SNR) and excellent parallel imaging ability for magnetic resonance imaging at ultrahigh fields, e.g., 7 T. In this study, we aim to numerically analyze the performance of an eight-channel ICE-decoupled loop array at 7 T. Three-dimensional electromagnetic (EM) and radiofrequency circuit co-simulation approach was employed. The values of all capacitors were obtained by optimizing the S-parameters of all coil elements. The EM simulation was used to accurately model the coil structure, the phantom and the excitation fields. All coil elements were well matched to 50 Ω and the isolation between any two coil elements was better −15 dB. The simulated S-parameters were consistent with the experimental results, indicating the simulation results were reliable. Compared with the conventional capacitively decoupled array, the ICE-decoupled array had higher sensitivity at the peripheral areas of the imaging subjects due to the shielding effect of the decoupling loops. The increased receive sensitivity resulted in an improvement of signal intensity and SNR for the ICE-decoupled array.

中文翻译：

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MRI 中 ICE 解耦环路阵列对 SNR 和并行成像改进的仿真验证

采用感应电流消除 (ICE) 或磁壁解耦方法的发射/​​接收 L/C 环路阵列已显示出高信噪比 (SNR) 和出色的并行成像能力，可用于超高场磁共振成像，例如 7 T在这项研究中，我们的目标是对 7 T 的八通道 ICE 解耦回路阵列的性能进行数值分析。采用了三维电磁 (EM) 和射频电路联合仿真方法。所有电容器的值都是通过优化所有线圈元件的 S 参数获得的。EM 仿真用于对线圈结构、体模和激励场进行精确建模。所有线圈元件均与 50 Ω 匹配良好，任意两个线圈元件之间的隔离度更好 -15 dB。模拟的 S 参数与实验结果一致，表明模拟结果是可靠的。与传统的电容去耦阵列相比，由于去耦回路的屏蔽效应，ICE去耦阵列在成像对象的外围区域具有更高的灵敏度。增加的接收灵敏度导致 ICE 解耦阵列的信号强度和 SNR 的改善。