Instrumentation for fetal monitoring - improvement in Doppler ultrasound technology

• Autorzy: Jeżewski J. , Wróbel J. , Horoba K. , Gacek A.
• Języki publikacji: EN

Abstrakty

EN

The most common noninvasive method of measuring fetal heart rate (FHR) utilizes pulsed Doppler ultrasound monitors. Ultrasound-derived fetal heart intervals are obtained from mechanical movements of the heart valves or heart wall. As distinct from the direct cardiac cycle recording, the analysis of the multi-phase movement process involves difficulties in precise measurement of cardiac interval distances. Linked both to the analog channel and the digital processing from today’s monitors, different factors influencing the quality of the FHR trace are presented. An emphasis is put on autocorrelation techniques for extraction of periodic signal from a noisy background. Two basic forms of autocorrelation function, the autocorrelation with adaptive window selection and crosscorrelation with a changeable template are discussed in detail.

Słowa kluczowe

EN

Doppler ultrasound; fetal heart rate; fetal monitoring; autocorrelation function

PL

USG Dopplera; tętno płodu; monitorowanie płodu; funkcja autokorelacji

• Wydawca: University of Silesia, Institute of Informatics, Computer Systems Department
• Czasopismo: Journal of Medical Informatics & Technologies
• Rocznik: 2001
• Tom: Vol. 2, Part. 2
• Strony: MT17--MT26
• Opis fizyczny: Bibliogr. 11 poz., rys., wykr.

Twórcy

autor

Jeżewski J.

• Institute of Medical Technology and Equipment, ul. Roosevelta 118, 41-800 Zabrze, Poland

autor

Wróbel J.

• Institute of Medical Technology and Equipment, ul. Roosevelta 118, 41-800 Zabrze, Poland

autor

Horoba K.

• Institute of Medical Technology and Equipment, ul. Roosevelta 118, 41-800 Zabrze, Poland

autor

Gacek A.

• Institute of Medical Technology and Equipment, ul. Roosevelta 118, 41-800 Zabrze, Poland

Bibliografia

• [1] BOEHM F.H., FIELDS L.M. The indirectly obtained fetal heart rate· Comparison of first- and second-generation electronic fetal monitors. American Journal of Obstetrics and Gynecology, 155, pp. 10-14, 1986.
• [2] CARTER M.C. Present-day performance qualities of cardiotocographs, British Journal of Obstetrics and Gynaecology, 99, pp. 817-820, 1992.
• [3] DAWES G.S., MOULDEN M., REDMAN C.W.G. Limitations of antenatal fetal heart rate monitors, American Journal of Obstetrics and Gynecology, 162, pp. 170-173, 1990.
• [4] DIVON M.Y. Autocorrelation techniques in fetal monitoring, American Journal of Obstetrics and Gynecology, 151, pp. 2-6, 1985.
• [5] DOCKER M.F. Doppler ultrasound mornitoring technology, British Journal of Obstetrics and Gynecology, Suppl. 9, pp. 18-20, 1993.
• [6] HAJDUK B., WRÓBEL J., ROLLA K., HOROBA K., JEŻEWSKI J., GACEK A. Ocena mechanicznej i elektrycznej aktywności serca płodu, II Konf. Techniki Informatyczne w Medycynie TIM·97, pp. 251-259, Ustroń 1997.
• [7] JEŻEWSKI J., WRÓBEL J. Kardiotokografia komputerowa, w ,,Biofizyczna diagnostyka płodu i noworodka" Ośrodek Wydawnictw Naukowych, pp. 54-80, Poznań, 1998.
• [8] JEŻEWSKI J., WRÓBEL J., HOROBA K., GRACZYK S., GACEK A. Coping with limitations of Doppler ultrasound fetal heart rate monitors, Proc. I st Regional Conf. of IEEE/EMBS·, pp. 9-10, New Delhi 1995.
• [9] JEŻEWSKI J., WRÓBEL J., HOROBA K., MOCZKO J., BRĘBOROWICZ G., GRACZYK S. Advances in Doppler ultrasound FHR monitoring, Kliniczna Perinatologia i Ginekologia, Suppl. IX, pp. 241-251, 1995.
• [10] MANNING G.K., DRIPPS J.H. Comparison of correlation and modulus difference processing algorithms for the determination of foetal heart rate from ultrasonic Doppler signals, Medical and Biological Engineering and Computing, 24, pp. 121-129, 1986.
• [11] TAYLOR J., PAULL C.J., HAYES-GILL B.R., CROWE J.A. Data compression of fetal Doppler ultrasound audio signals using zero-crossing analysis, Medical Engineering and Physics, 19/6, pp. 572-580 1997.