Removal of electrocardiographic interference and artifacts from diaphragm electromyography

Gabriela Grońska, Elisabetta Peri, X. Long, J. V. Dijk, M. Mischi
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Abstract

Diaphragmatic electromyography (dEMG) holds the potential to monitor respiration. However, its acquisition is affected by electrocardiographic (ECG) interference and motion artifacts, making its investigation and use in clinical practice still challenging. Singular value decomposition (SVD) methods have been reported in the literature denoising the dEMG. Here a new ratio index criterion is combined with a SVD based algorithm to aid this challenge. The advantage of the proposed approach is in use of the frequency spectrum as a reference to remove unwanted components from the signal. Two synthetic datasets combining EMG with ECG only and with ECG and motion artifacts were tested using a signal-to-noise ratio ranging from −20 to 0dB to assess the performance of the method. The performance was compared with an earlier developed SVD-based algorithm that employed a calibration curve for the selection of unwanted components. Our results show that our new proposed method reached significantly better performance in both time and frequency domains for the majority of presented SNRs in the dataset containing artifacts. Additionally for the same dataset, the method obtained the average median improvement in the SNR of 12 dB and, the average median percentage improvement of 157% in the reconstructed EMG signal. The solution does not need an additional reference for the ECG. Its performance was proven on the data containing not only electrocardiographic disturbance but also motion artifacts, showing promise for further use on the real data.
去除横膈膜肌电图的心电图干扰和伪影
膈肌电图(dEMG)具有监测呼吸的潜力。然而,它的获取受到心电图干扰和运动伪影的影响,使其在临床实践中的研究和应用仍然具有挑战性。奇异值分解(SVD)方法已在文献中报道去噪的dEMG。本文将一种新的比率索引准则与基于奇异值分解的算法相结合,以解决这一问题。该方法的优点是利用频谱作为参考,从信号中去除不需要的成分。使用- 20至0dB的信噪比测试了两个合成数据集,分别将肌电图与ECG单独结合以及ECG和运动伪影结合,以评估该方法的性能。将其性能与先前开发的基于svd的算法进行了比较,该算法采用校准曲线来选择不需要的成分。我们的结果表明,我们提出的新方法在包含伪影的数据集中的大多数呈现的信噪比在时域和频域都达到了显着更好的性能。此外,对于同一数据集,该方法获得的信噪比平均中位数改善为12 dB,重建肌电信号的平均中位数百分比改善为157%。该解决方案不需要额外的心电图参考。结果表明,该方法不仅在心电图干扰数据上有效,而且在运动伪影数据上也具有良好的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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