Simultaneous estimation of arterial and venous oxygen saturation using a camera

Mark van Gastel; Hangbing Liang; Sander Stuijk; Gerard de Haan

doi:10.1117/12.2287209

20 February 2018 Simultaneous estimation of arterial and venous oxygen saturation using a camera

Mark van Gastel, Hangbing Liang, Sander Stuijk, Gerard de Haan

Proceedings Volume 10501, Optical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics; 105010W (2018) https://doi.org/10.1117/12.2287209
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

Optical monitoring of arterial blood oxygenation, SpO₂, using cameras has recently been shown feasible by measuring the relative amplitudes of the remotely sensed PPG waveforms captured at different wavelengths. SvO₂ measures the venous blood oxygenation which together with SpO₂ provides an indication of tissue oxygen consumption. In contrast to SpO₂ it usually still requires a blood sample from a pulmonary artery catheter. In this work we present a method which suggests simultaneous estimation of SpO₂ and SvO₂ with a camera. Contrary to earlier work, our method does not require external cuffs leading to better usability and improved comfort. Since the arterial blood varies synchronously with the heart rate, all frequencies outside the heart rate band are typically filtered out for SpO₂ measurements. For SvO₂ estimation, we include intensity variations in the respiratory frequency range since respiration modulates venous blood due to intrathoracic pressure variations in the chest and abdomen. Consequently, under static conditions, the two dominant components in the PPG signals are respiration and pulse. By measuring the amplitude ratios of these components, it seems possible to monitor both SpO₂ and SvO₂ continuously. We asked healthy subjects to follow an auditory breathing pattern while recording the face and hand. Results show a difference in estimated SpO₂ and SvO₂ values in the range 5-30 percent for both anatomical locations, which is normal for healthy people. This continuous, non-contact, method shows promise to alert the clinician to a change in patient condition sooner than SpO₂ alone.

Citation Download Citation

Mark van Gastel, Hangbing Liang, Sander Stuijk, and Gerard de Haan "Simultaneous estimation of arterial and venous oxygen saturation using a camera", Proc. SPIE 10501, Optical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics, 105010W (20 February 2018); https://doi.org/10.1117/12.2287209

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