Noise Cancellation of Fetal Heart Rate based on Improved FastICA Algorithm

Chuan Wang ； Rongdan Zeng ； Yaosheng Lu ； Huijin Wang

《International Core Journal of Engineering》 7卷10期 (2021/10) Pp. 29-35

https://doi.org/10.6919/ICJE.202110_7(10).0006

摘要

To improve the traditional FastICA algorithm which is sensitive to the initial weights, this paper proposes an improved FastICA algorithm based on a super relaxation factor to extract the fetal heart rate. Methods Firstly, the fetal heart rate signals in the Czech database were centralized and whitened to remove the correlation between the signals; then, a super relaxation factor was introduced into the Newton iterative algorithm to process the randomly generated initial weights, and the fetal heart rate was extracted by the improved FastICA algorithm; finally, the extraction results of the fetal heart rate signals were evaluated by visualizing the waveforms and quantitative metrics. The experimental results show that the signal-to-noise ratio of the algorithm is improved and the fetal heart rate extracted by the improved algorithm is almost free of artifacts and ECG artifacts. The improved FastICA algorithm based on the super relaxation factor relaxes the requirement of initial weights while maintaining the convergence speed, avoids the convergence imbalance, reduces the number of iterations, and can extract a clearer fetal heart rate.

關鍵字

FastICA ； Fetal Heart Rate ； Signal to Noise Ratio ； Overrelaxation Factor

參考文獻

MCNICHOLS, J.M., ERIC, J.B., TURRI, W.F., and HILL, K.L., "Design and Implementation of an Embedded NIOS Ⅱ System for JPEG2000 Tier Ⅱ Encoding," International Journal of Reconfigurable Computing, vol. 2013, (2013) p. 140234.140231-140234.140239.

AYRES-DE-CAMPOS, DIOGO, SPONG, CATHERINE, Y., CHANDRAHARAN, and EDWIN, "FIGO consensus guidelines on intrapartum fetal monitoring: Cardiotocography," International Journal of Gynecology & Obstetrics the Official Organ of the International Federation of Gynaecology & Obstetrics, vol. (2015) p. 13–24

ARNOLD, K.C. and FLINT, C.J., (2017). Intrapartum Fetal Heart Rate Monitori ng: Nomenclature, Interpretation, and General Management Principles, Obstet rics Essentials: A Question-Based Review 101-107. DOI= http://dx.doi.org/10.1007/978-3-319-57675-6_16.

YUM, M.-K., KIM, K., KIM, J.-H., and PARK, E.-Y., (2005). A Consistent Abnor mality in the Average Local Smoothness of Fetal Heart Rate in Growth-Restric ted Fetuses Affected by Severe Pre-Eclampsia. Hypertension research: official journal of the Japanese Society of Hypertension 27(01/01), 911-918. DOI= http://dx.doi.org/10.1291/hypres.27.911.

SUBHA, T.D. and RESHMA, V.D., "A Study of Non-invasive Heart Rate Monitoring System by using FPGA," Materials Today Proceedings, vol. 4, (2017) p. 4228-4238.