Evaluation of arterial oxygen saturation using RGB camera-based remote photoplethysmography

Izumi Nishidate; Kazuya Nakano; Daniel McDuff; Kyuichi Niizeki; Yoshihisa Aizu; Hideaki Haneishi

doi:10.1117/12.2290448

20 February 2018 Evaluation of arterial oxygen saturation using RGB camera-based remote photoplethysmography

Izumi Nishidate, Kazuya Nakano, Daniel McDuff, Kyuichi Niizeki, Yoshihisa Aizu, Hideaki Haneishi

Proceedings Volume 10501, Optical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics; 1050111 (2018) https://doi.org/10.1117/12.2290448
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

Plethysmogram is the periodic variation in blood volume due to the cardiac pulse traveling through the body. Photo-plethysmograph (PPG) has been widely used to assess the cardiovascular system such as heart rate, blood pressure, cardiac output, vascular compliance. We have previously proposed a non-contact PPG imaging method using a digital red-green-blue camera. In the method, the Monte Carlo simulation for light transport is used to specify a relationship among the RGB-values and the concentrations of oxygenated hemoglobin (C_HbO) and deoxygenated hemoglobin (C_HbR). The total hemoglobin concentration (C_HbT) can be calculated as a sum of C_HbO and C_HbR. Applying the fast Fourier transform (FFT) band pass filters to each pixel of the sequential images for C_HbT along the time line, two-dimentional plethysmogram can be reconstructed. In this study, we further extend the method to imaging the arterial oxygen saturation (SaO₂). The PPG signals for both C_HbO and C_HbR are extracted by the FFT band pass filter and the pulse wave amplitudes (PWAs) of C_HbO and C_HbR are calculated. We assume that the PWA for C_HbO and that for CHbR are decreased and increased as SaO₂ is decreased. The ratio of PWA for C_HbO and that for C_HbR are associated to the reference value of SaO₂ measured by a commercially available pulse oximeter, which provide an empirical formula to estimate SaO₂ from the PPG signal at each pixel of RGB image. In vivo animal experiments with rats during varying the fraction of inspired oxygen (FiO₂) demonstrated the feasibility of the proposed method.

Citation Download Citation

Izumi Nishidate, Kazuya Nakano, Daniel McDuff, Kyuichi Niizeki, Yoshihisa Aizu, and Hideaki Haneishi "Evaluation of arterial oxygen saturation using RGB camera-based remote photoplethysmography", Proc. SPIE 10501, Optical Diagnostics and Sensing XVIII: Toward Point-of-Care Diagnostics, 1050111 (20 February 2018); https://doi.org/10.1117/12.2290448

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