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A PC-aided optical foetal heart rate detection system.

Rami J Oweis1, Hala As'ad, Amany Aldarawsheh

  • 1Biomedical Engineering Department, Faculty of Engineering, Jordan University of Science and Technology , PO Box 3030, Irbid 22110 , Jordan.

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This study introduces a novel non-invasive optical technique for monitoring fetal heart rate using infrared light and a photovoltaic detector. The system demonstrates high accuracy and correlation with traditional methods, offering a safe and effective monitoring solution.

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Obstetrics

Background:

  • Fetal heart rate monitoring is crucial for maternal and fetal well-being.
  • Existing methods may have limitations in accessibility or invasiveness.
  • Non-invasive optical techniques offer a promising alternative for fetal monitoring.

Purpose of the Study:

  • To develop and validate a non-invasive optical system for fetal heart rate (FHR) detection.
  • To assess the accuracy and reliability of the proposed system compared to Cardiotocography (CTG).

Main Methods:

  • A novel system utilizing a near-infrared (IR) beam (880 nm) transmitted through the maternal abdomen.
  • Photoplethysmography (PPG) circuits and a low-noise photodetector to capture signals.
  • MATLAB-based software with recursive least squares adaptive filtration for FHR extraction via a National Instrumentation Data Acquisition Card (NIDAQ).

Main Results:

  • High correlation (coefficient = 0.978) between the proposed system and CTG.
  • Correlation confidence interval of 88-99.6% and a statistically significant p-value of 0.034.
  • The system exhibits low power consumption, low cost, high signal-to-noise ratio, and reduced ambient light interference.

Conclusions:

  • The developed non-invasive optical system accurately detects fetal heart rate.
  • This technique provides a safe, cost-effective, and user-friendly alternative for fetal monitoring during late pregnancy.
  • The system's performance indicates its potential for widespread clinical adoption.