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Monte Carlo simulations of photoplethysmography and pulse oximetry signals for designing wearable devices
Russian version
Kirillin M.Yu. 1,2, Kurakina D.A. 1,2, Perekatova V.V. 1,2, Serebryakova A.A. 1,2, Sveshnikova M.A.1,2, Nasrulaev S.F.3, Gurkin R.V.3, Ivanchenko M.V.1, Sergeeva E.A. 1,2
1Lobachevsky University of Nizhny Novgorod, Nizhny Novgorod, Russia
2Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
3SberDevices, Moscow, Russia
Email: mkirillin@yandex.ru
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This paper employs Monte Carlo numerical simulations to analyze the choice of source-detector distance in the optical scheme of a wearable device designed for photoplethysmography and reflectance-mode pulse oximetry. The simulations were performed for a multilayer medium mimicking human finger biological tissues at three wavelengths: green, red, and infrared. For each wavelength, the simulation was conducted for both systolic and diastolic phases of the heartbeat. This enabled an analysis of the dependence of the relative heartbeat-induced signal change on the source-detector separation. It is demonstrated that the relative signal change between systolic and diastolic phases increases monotonically with increasing source-detector distance. Furthermore, the dependence of pulse oximetry calibration curve coefficients on this parameter was identified. Based on the demonstrated effects, recommendations for optimizing the source-detector distance in commercial wearable devices are provided, considering the specified technical characteristics of the optical components. Keywords: biophotonics, photoplethysmography, pulse oximetry, Monte Carlo simulations.
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