Transabdominal fetal heart rate detection using NIR photopleythysmography: instrumentation and clinical results.

Gan Kok Beng, Edmond Zahedi, Mohd Alauddin Mohd Ali

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In obstetrics, fetal heart rate (FHR) detection remains the standard for intrapartum assessment of fetal well-being. In this paper, a low-power (< 55 mW) optical technique is proposed for transabdominal FHR detection using near-infrared photoplesthysmography (PPG). A beam of IR-LED (890 nm) propagates through to the maternal abdomen and fetal tissues, resulting in a mixed signal detected by a low-noise detector situated at a distance of 4 cm. Low-noise amplification and 24-bit analog-to-digital converter resolution ensure minimum effect of quantization noise. After synchronous detection, the mixed signal is processed by an adaptive filter to extract the fetal signal, whereas the PPG from the mother's index finger is the reference input. A total of 24 datasets were acquired from six subjects at 37 +/- 2 gestational weeks. Results show a correlation coefficient of 0.96 (p-value < 0.001) between the proposed optical and ultrasound FHR, with a maximum error of 4%. Assessment of the effect of probe position on detection accuracy indicates that the probe should be close to fetal tissues, but not necessarily restricted to head or buttocks.

Original languageEnglish
Pages (from-to)2075-2082
Number of pages8
JournalIEEE transactions on bio-medical engineering
Volume56
Issue number8
Publication statusPublished - Aug 2009

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Fetal Heart Rate
Noise
Fetus
Obstetrics
Tissue
Buttocks
Adaptive filters
Digital to analog conversion
Abdomen
Fingers
Light emitting diodes
Amplification
Ultrasonics
Head
Mothers
Infrared radiation
Detectors

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Transabdominal fetal heart rate detection using NIR photopleythysmography : instrumentation and clinical results. / Kok Beng, Gan; Zahedi, Edmond; Mohd Ali, Mohd Alauddin.

In: IEEE transactions on bio-medical engineering, Vol. 56, No. 8, 08.2009, p. 2075-2082.

Research output: Contribution to journalArticle

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