1993 Fiscal Year Final Research Report Summary
Optimally controlled detection system for fetal body movement, respiratory like movements, and heart rate.
| Project/Area Number |
04671022
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Obstetrics and gynecology
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| Research Institution | Teikyo University |
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Principal Investigator |
HOGAKI Masanobu Teikyo University Department of Obstet.& Gynec.Professor, 医学部, 教授 (60147105)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAKOSHI Yoshiki Department of Electronic & Electronical Engineering, School of Technology, Gumma, 工学部, 助教授 (10174640)
YAMAMOTO Tatsuo Teikyo University Department of Obstet.& Gynec., 医学部, 講師 (40167721)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Fetal heart rate / Fetal movement / Fetal respiratory movement / Quadrature detection / Autocorrelation / Pulsed Doppler signal / Slow wave pulsed Doppler / Displacement measurement |
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| Research Abstract |
Fetal body movements, heart rate, and respiratory movements in utero can be detected from the earlt stage of pregnancy by the simple system combined with a conventional pulsed Doppler device and a ubiquitous personal computer. Finite displacements of the fetal tissue of heart and liver are calculated from the slow wave components of ultrasonic pulsed Doppler signals by continuous calculations of arc-tangent coeficients with modified quadrature detection method. This newly introduced method of non-parametric frequency estimation afforded an improved performance over that obtained with the previously used method of autocorrelation. Clinical application of the system enabled fetal heart rate to be optimally determined from 6 weeks by the vaginal examination. Detection of fetal body movements was from 6 weeks, and respiratory movements in utero from 15 weeks.
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