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Simulation verification of SNR and parallel imaging improvements by ICE-decoupled loop array in MRI

机译:MRI ICE解耦环阵列对SNR的仿真验证和并行成像改进

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摘要

Transmit/receive L/C loop arrays with the induced current elimination (ICE) or magnetic wall decoupling method has shown high signal-to-noise (SNR) and excellent parallel imaging ability for MR 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 (3-D) electromagnetic (EM) and radiofrequency (RF) 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 accurately modeled the coil structure, the phantom and the excitation. All coil elements were well matched to 50 ohm and the isolation between any two coil elements was better −15 dB. The simulated S parameters were exactly similar 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 image 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.
机译:具有感应电流消除(ICE)或磁壁去耦方法的发送/接收L / C环路阵列显示出高信噪比(SNR)和出色的并行成像能力,可用于超高磁场(例如7 T)的MR成像。在这项研究中,我们旨在对8通道ICE解耦回路阵列在7 T时的性能进行数值分析。采用了三维(3-D)电磁(EM)和射频(RF)电路协同仿真方法。通过优化所有线圈元件的S参数来获得所有电容器的值。 EM仿真可精确建模线圈结构,体模和励磁。所有线圈元件都很好地匹配到50欧姆,任何两个线圈元件之间的隔离度都更好-15 dB。模拟的S参数与实验结果完全相似,表明模拟结果可靠。与传统的电容解耦阵列相比,由于解耦环路的屏蔽作用,ICE解耦阵列在图像对象的外围区域具有更高的灵敏度。接收灵敏度的提高导致ICE解耦阵列的信号强度和SNR有所改善。

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