Photoplethysmographic imaging of the low-frequency hemodynamics in peripheral vessels
Ivan U. Volkov, Andrey V. Fomin, Dmitry I. Mayskov, Ivan S. Zaletov, Anatoly V. Skripal and Andrey A. Sagaidachnyi A.A., Saratov State University, Russia
Abstract
In most cases photoplethysmography is used in the field of functional diagnostics to determine high-frequency heart rate parameters with a central frequency of 1 Hz. This work focuses on the detection of low-frequency hemodynamic parameters manifested in peripheral vessels within frequency band (0.005-0.5 Hz). To construct the spatial distribution of hemodynamics the method of imaging photoplethysmography (iPPG) was used based on a near-infrared CMOS camera. The scheme of the setup and algorithm of signal processing are described. Two-dimensional maps of the amplitudes of hemodynamic oscillations in the respiratory, myogenic, neurogenic and endothelial ranges are presented. A comparison of low-frequency hemodynamic oscillations obtained by iPPG, thermography, and laser Doppler flowmetry during flow-mediated vasodilation has been carried out. The prospects for the analysis of low-frequency components of hemodynamics in the field of functional medical diagnostics are described.
Speaker
Ivan Volkov
Saratov State University
Russia
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