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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.
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3--16
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Bibliogr. 26 poz., rys., wykr.
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autor
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- Institute of Precision and Biomedical Engineering, Faculty of Mechatronics, Warsaw University of Technology, św. A. Boboli 8, 02-525 Warszawa, Poland, K.Kalużynski@mchtr.pw.edu.pl
Bibliografia
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- 8. Trudinger B.J., Cook C.M.: Fetal breathing movements - A comparison of hard copy records produced by M-mode and Doppler ultrasound. Early Hum. Dev., 1989, 20, 247-253.
- 9. Besinger R.E. and Johnson T.R.B.: Doppler recordings of fetal movement: clinical correlation with real-time ultrasound. Obstet. Gynecol., 1989, 74, 277-280.
- 10. Yamakoshi Y., Otaki H., Shinozuka N., Masuda H.: Internal tissue displacement measurement based on ultrasonic wave Doppler signal detection and its application to fetal movement monitoring Ultrasonics, 1996, 34, 769-775.
- 11. Karlsson B., Pourcelot D., Helgason T., Pourcelot L., Berson M.: Distance of foetal movement measured using the analytical signal derived from nondirectional Doppler sound. Med. Eng. Phys. 1998, 20, 325-331.
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- 16. Kałużyński K., Berson M., Pourcelot L., Pałko T.: Detection of fetal breathing and cardiac signals and rhythms in the ultrasonic Doppler signal recorded on the surface of the maternal abdomen. Med. Biol. Eng. Comput., 1993, 31, 405-411.
- 17. Yamakoshi Y., Shimizu T., Shinozuka N., Masuda H.: Automated Fetal Breathing Detection from Internal Small Displacement Measurement. Biomed. Technik, 1996, 41, 242-247.
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Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BPZ1-0043-0041