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首页> 外文期刊>Superconductor Science & Technology >Feedback solutions for low crosstalk in dense arrays of high-T-c SQUIDs for on-scalp MEG
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Feedback solutions for low crosstalk in dense arrays of high-T-c SQUIDs for on-scalp MEG

机译：用于在头皮上的高T-C鱿鱼致密阵列的低串扰的反馈解决方案

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摘要

Magnetoencephalography (MEG) systems based on a dense array of high critical temperature (high-T-c) superconducting quantum interference devices (SQUIDs) can theoretically outperform a state-of-the-art MEG system. On the way towards building such a multichannel system, we evaluate feedback methods suitable for use in dense high-T-c SQUID arrays where the sensors are in very close proximity to the head (on-scalp MEG). We test on-chip superconducting coils and direct injection of the feedback current into the SQUID loop as alternatives to the wire-wound copper coils commonly used in single-channel high-T-c SQUID-based MEG systems. For the evaluation, we have performed coupling, noise, and crosstalk measurements. We conclude that direct injection is the optimal solution for dense on-scalp MEG as it gives crosstalk below 0.5% even between SQUIDs whose pickup loops are within 0.8 mm of one another. Further, this solution provides sufficient flux coupling without adding additional noise. Finally, it does not compromise the standoff distance, which is important for on-scalp MEG.
机译：基于密集的高临界温度（高T-C）超导量子干扰装置（Squids）的磁性脑图（MEG）系统可以理论上优于最先进的MEG系统。在建立这种多通道系统的途中，我们评估适用于密集的高T-C鱿鱼阵列的反馈方法，其中传感器在头部非常靠近头部（头皮MEG）。我们测试片上超导线圈，并将反馈电流直接喷射到鱿鱼圈中，作为线缠绕铜线线圈的替代品，其常规用于单通道高T-C鱿鱼的MEG系统。对于评估，我们已经进行了耦合，噪声和串扰测量。我们得出结论，直接注射是对致密的头皮MEG的最佳解决方案，因为它即使在彼此拾取环的鱿鱼之间也使串扰低于0.5％。此外，该解决方案提供足够的磁通耦合而不增加额外的噪声。最后，它不会损害距离距离，这对头皮MEG很重要。

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