Purpose: Receive array layout, noise mitigation and B0 field strength are crucial contributors to signal-to-noise ratio (SNR) and parallel imaging performance. Here, we investigate SNR and parallel imaging gains at 10.5 Tesla (T) compared to 7T using 32-channel receive arrays at both fields. Methods: A self-decoupled 32-channel receive array for human brain imaging at 10.5T (10.5T-32Rx), consisting of 31 loops and one cloverleaf element, was co-designed and built in tandem with a 16-channel dual-row loop transmitter. Novel receive array design and self-decoupling techniques were implemented. Parallel imaging performance, in terms of SNR and noise amplification (g-factor), of the 10.5T-32Rx was compared to the performance of an industry-standard 32-channel receiver at 7T (7T-32Rx) via experimental phantom measurements. Results: Compared to the 7T-32Rx, the 10.5T-32Rx provided 1.46 times the central SNR and 2.08 times the peripheral SNR. Minimum inverse g-factor value of the 10.5T-32Rx (min(1/g) = 0.56) was 51% higher than that of the 7T-32Rx (min(1/g) = 0.37) with R=4x4 2D acceleration, resulting in significantly enhanced parallel imaging performance at 10.5T compared to 7T. The g-factor values of 10.5T-32Rx were on par with those of a 64-channel receiver at 7T, e.g. 1.8 versus 1.9, respectively, with R=4x4 axial acceleration. Conclusion: Experimental measurements demonstrated effective self-decoupling of the receive array as well as substantial gains in SNR and parallel imaging performance at 10.5T compared to 7T.

中文翻译：

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自解耦 32 通道接收阵列，用于 10.5T 人脑磁共振成像

目的：接收阵列布局、噪声抑制和 B0 场强是信噪比 (SNR) 和并行成像性能的关键因素。在这里，我们在两个场中使用 32 通道接收阵列研究 10.5 特斯拉 (T) 与 7T 相比的 SNR 和并行成像增益。方法：一个用于人脑成像的 10.5T（10.5T-32Rx）自解耦 32 通道接收阵列，由 31 个回路和一个三叶草元件组成，与 16 通道双排单元协同设计和构建。回路发射器。实施了新颖的接收阵列设计和自去耦技术。通过实验体模测量，将 10.5T-32Rx 在 SNR 和噪声放大（g 因子）方面的并行成像性能与 7T (7T-32Rx) 的行业标准 32 通道接收器的性能进行了比较。结果：与 7T-32Rx 相比，10.5T-32Rx 提供了 1.46 倍的中心 SNR 和 2.08 倍的外围 SNR。10.5T-32Rx (min(1/g) = 0.56) 的最小反 g 因子值比 7T-32Rx (min(1/g) = 0.37) 高 51%，R=4x4 2D 加速度，与 7T 相比，10.5T 的并行成像性能显着增强。10.5T-32Rx 的 g 因子值与 7T 的 64 通道接收器的 g 因子值相当，例如分别为 1.8 和 1.9，R=4x4 轴向加速度。结论：实验测量表明，与 7T 相比，10.5T 接收阵列具有有效的自去耦以及 SNR 和并行成像性能的显着提高。56) 比 7T-32Rx (min(1/g) = 0.37) 高 51%，R=4x4 2D 加速度，与 7T 相比，10.5T 并行成像性能显着增强。10.5T-32Rx 的 g 因子值与 7T 的 64 通道接收器的 g 因子值相当，例如分别为 1.8 和 1.9，R=4x4 轴向加速度。结论：实验测量表明，与 7T 相比，10.5T 接收阵列具有有效的自去耦以及 SNR 和并行成像性能的显着提高。56) 比 7T-32Rx (min(1/g) = 0.37) 高 51%，R=4x4 2D 加速度，与 7T 相比，10.5T 并行成像性能显着增强。10.5T-32Rx 的 g 因子值与 7T 的 64 通道接收器的 g 因子值相当，例如分别为 1.8 和 1.9，R=4x4 轴向加速度。结论：实验测量表明，与 7T 相比，10.5T 接收阵列具有有效的自去耦以及 SNR 和并行成像性能的显着提高。