Noninvasive measurement of fetal oxygen saturation can provide clinicians with critical information about fetal health, and potentially contribute to improved management of childbirth. We recently proposed a novel transabdominal fetal pulse oximetry through frequency-modulated continuous-wave near-infrared spectroscopy. Here, we report our experimental results which validate one of the most important steps of our method. By shining near-infrared light on the pregnant sheep abdomen and measuring the time-resolved reflectance, we have successfully extracted the fetal heartbeat signal originating from deep tissue. This result sets up the foundation to further improve our transabdominal fetal oxygen saturation measurement method.
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