并行激励中阵列元素之间互耦的预补偿。
Precompensation for mutual coupling between array elements in parallel excitation.
机构信息
Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States;
出版信息
Quant Imaging Med Surg. 2011 Dec;1(1):4-10. doi: 10.3978/j.issn.2223-4292.2011.11.02.
Parallel transmission or excitation has been suggested to perform multi-dimensional spatial selective excitation to shorten the pulse width using a coil array and the sensitivity information. The mutual coupling between array elements has been a critical technical issue in RF array designs, which can cause artifacts on the excitation profile, leading to degraded excitation performance and image quality. In this work, a precompensation method is proposed to address the mutual coupling effect in parallel transmission by introducing the mutual coupling coefficient matrix into the RF pulses design procedure of the parallel transmission. 90° RF pulses have been designed using both the original transmit SENSE method and the proposed precompensation method for RF arrays with non-negligible mutual coupling, and their excitation profiles are generated by simulating the Bloch equation. The results show that the mutual coupling effect can be effectively compensated by using the proposed method, yielding enhanced tolerance to insufficient mutual decoupling of RF arrays in parallel excitation, ultimately, providing improved performance and accuracy of parallel excitation.
并行传输或激励被建议用于使用线圈阵列和灵敏度信息进行多维空间选择性激励，以缩短脉冲宽度。在 RF 阵列设计中，阵列元件之间的互耦是一个关键的技术问题，它会导致激励轮廓上的伪影，从而降低激励性能和图像质量。在这项工作中，提出了一种预补偿方法来解决并行传输中的互耦效应，通过将互耦系数矩阵引入到并行传输的 RF 脉冲设计过程中。对于具有不可忽略互耦的 RF 阵列，使用原始的传输 SENSE 方法和所提出的预补偿方法设计了 90°RF 脉冲，并通过模拟 Bloch 方程生成了它们的激励轮廓。结果表明，所提出的方法可以有效地补偿互耦效应，提高了对并行激励中 RF 阵列的不足互去耦的容忍度，最终提供了改进的并行激励性能和准确性。
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