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1 2004

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Online analysis of the ultrasonic Doppler signals of the fetal motor activity in the LabVIEW environment

Kret T., Kałużyński K.

Biocybernetics and Biomedical Engineering

2004

Vol. 24, no. 2

41-49

Fetal motor activity and the fetal heart rate are important indicators of fetal well-being. The motor activity consist of pseudobreathing movements, trunk and limb movements. These movements can be detected using the ultrasonic Doppler method. The software developed using the LabVIEW environment processes in real time Doppler signals acquired via the PC sound card. Displacements of the structures, velocities and accelerations of these displacements as well as histograms of the velocities and accelerations are computed. Spectral analysis of the chest displacement signal allows determining the rhythm of pseudobreatching movements. The autocorrelation function is used to compute the fetal heart rate. The software was tested on simulated signals and real fetal Doppler signals.