Fetal Electrocardiogram Signal Extraction Based on Fast Independent Component Analysis and Singular Value Decomposition

Figures

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  Figure 1. R-wave detection of ECG signals.

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  Figure 2. Q-waves and S-waves detection of ECG signals.

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  Figure 3. A total of 7000 sampling points of R01 data in the ADFECGDB database were applied to the extraction algorithm: (a) The second channel of maternal abdominal mixed signals; (b) FECG signals estimated by the SVD algorithm; (c) MECG signals extracted by the FastICA algorithm; (d) Residual noises assessed by the FastICA algorithm; and FECG signals extracted by the proposed algorithm.

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  Figure 4. A total of 7000 sampling points of R04, R07, and R08 data in the ADFECGDB database were applied to the extraction algorithm: (a) Maternal abdominal mixed signals (R04, R07, and R08 signals were, respectively, used as the maternal abdominal mixed signals of the third, third and second channels); (b) FECG signals estimated by the SVD algorithm; and (c) FECG signals extracted by the proposed algorithm.

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  Figure 5. A total of 7000 sampling points of R10 data in the ADFECGDB database were applied to the extraction algorithm: (a) The second channel of maternal abdominal mixed signals in R10 data; (b) FECG signals estimated by the SVD algorithm; (c) MECG signals extracted by the FastICA algorithm; and (d) FECG signals extracted by the proposed algorithm.

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  Figure 6. The FECG signal analysis GUI mainly consisted of six parts: (a) Data import; (b) Basic information; (c) Original signal browser; (d) Results viewer; (e) Analysis of key characteristic parameters; and (f) Characteristic reference values.

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  Figure 7. Evaluation of the accuracy of maternal and fetal heart rate calculations using variances. The blue curves in (a) and (b) were maternal and fetal heart rates calculated, respectively. The orange curves in (a) and (b) represented the difference between the heart rate and the real heart rate of each channel. The yellow dotted lines represented, respectively, the reference range of normal heart rates of the mother and the fetus.

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  Figure 8. Detection of QRS waves (using R01 data from the ADFECGDB database): (a) is the detection results of QRS waves; (b) is the amplification marker of (a).

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  Figure 9. Detection of ST segments (using R01 data from the ADFECGDB database): (a) is the detection results of ST segments; (b) is the amplification marker of (a).