Ferrite Shield to Enhance the Performance of Optically Pumped Magnetometers for Fetal Magnetocardiography.
Ferrite Shield to Enhance the Performance of Optically Pumped Magnetometers for Fetal Magnetocardiography.
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DOI：
10.3390/jcm12093078
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发表时间：
2023-04-24
影响因子：
3.9
通讯作者：
Wakai, Ronald
中科院分区：
文献类型：
--
作者：
Tardelli, Gabriela P. P.;Phan, Tan;Strasburger, Janette;Baffa, Oswaldo;Wakai, Ronald
胎儿心磁图（fMCG）已被证明是一个重要的工具，用于产前监测心电活动;然而，超导量子仪器（SQUID）的高成本构成了限制的传播fMCG作为一种常规的临床技术。近来，在人大小的圆柱形屏蔽件内操作的光泵磁力计（OPM）使得fMCG更加实用，但是通过屏蔽件开口进入的环境磁干扰显著降低了fMCG信号的质量。本研究的目的是通过将OPM阵列放置在小型铁氧体屏蔽内来进一步衰减这些干扰。在一个人大小的三层高导磁合金圆柱形屏蔽罩内，对10名受试者进行了有无铁氧体屏蔽罩的快速消费品记录。虽然胎儿信号略有衰减，但环境干扰大大减少，母体干扰也减少了。这显著提高了信噪比，并提高了较小波形分量的分辨率。性能的提高是最高的轴向方向，并弥补了一个主要的弱点，开放式，人大小的盾牌。铁氧体屏蔽对于三轴OPM传感器的部署尤其有利，因为三轴OPM传感器需要在所有方向上进行有效屏蔽。
Fetal magnetocardiography (fMCG) has proven to be an important tool for the prenatal monitoring of electrical cardiac activity; however, the high cost of superconducting quantum instrumentation (SQUID) poses a limitation for the dissemination of fMCG as a routine clinical technique. Recently, optically pumped magnetometers (OPMs) operating within person-sized, cylindrical shields have made fMCG more practical, but environmental magnetic interference entering through the shield opening substantially degrades the quality of fMCG signals. The goal of this study was to further attenuate these interferences by placing the OPM array within a small ferrite shield. FMCG recordings were made with and without the ferrite shield in ten subjects inside a person-sized, three-layer mu-metal cylindrical shield. Although the fetal signal was slightly attenuated, the environmental interference was reduced substantially, and maternal interference was also diminished. This increased the signal-to-noise ratio significantly and improved the resolution of the smaller waveform components. The performance improvement was highest in the axial direction and compensated for a major weakness of open-ended, person-sized shields. The ferrite shield is especially beneficial for the deployment of triaxial OPM sensors, which require effective shielding in all directions.
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