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Smartphone Pulse Oximetry Using Two-tone Camera-based Photoplethysmography

Abstract #

SpO 2 monitoring is a non-invasive measure of blood oxygen saturation levels, particularly important to monitor respiratory and heart circulatory diseases. Incorporating SpO 2 measurement into smartphones has the potential to improve patient access and cost-effective monitoring of health status. This paper presents a new smartphone camera-based photoplethys-mography technique for peripheral oxygen saturation measurement without external devices. Most existing methods have limitations for medical use due to a lack of accuracy and insufficient validation. Unlike other approaches, the proposed method uses the smartphone frontal camera and two-tone image patterns to control the emitted light spectrum, allowing for calibration and future clinical application. The method was tested on healthy subjects and demonstrated a strong correlation with reference values (r = −0.742). This approach improves camera-based oximetry acquisition and a validation protocol is also proposed for calibration, highlighting its clinical potential.


Bibtex #

  author={Raposo, Afonso and Silva, Rafael and Rosário, Luís Brás and Sanches, João and da Silva, Hugo Plácido},
  booktitle={2023 IEEE 7th Portuguese Meeting on Bioengineering (ENBENG)},
  title={Smartphone Pulse Oximetry Using Two-tone Camera-based Photoplethysmography},
  keywords={Pulse oximeter;Protocols;Pulse measurements;Wavelength measurement;Cameras;Photoplethysmography;Calibration;Pulse Oximetry;Camera-based Photoplethys-mography;Smartphone;mHealth},