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1 Biocybernetics and Biomedical Engineering

1 2007

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Study of properties of periodic fetal movements and of the corresponding ultrasonic Doppler signals

Kałużyński K., Kret T., Sieńko J.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 4

3-16

Doppler signals collected on the abdomen of the pregnant woman were submitted to the discrete wavelet transform using the db 10 wavelet. The wavelet reconstruction products were submitted to the autocorrelation analysis. The processing, supported with the ultrasonographic scanning enabled identification of the fetal periodic activities. The fetal pseudo-breathing movement velocity always falls in the range of 5-10 mm/s (Doppler frequency range 12.5-25 Hz), velocities of cardiac structures - in the range of 20-75 mm/s (Doppler frequency 50-200 Hz). The signals resulting from fetal displacements provoked by maternal breathing and cardiac action or fetal hiccup are expected not to adversely affect estimation of the fetal rhythms. These findings are important for the development of fetal monitoring systems.