An iPPG-Based Device for Pervasive Monitoring of Multi-Dimensional Cardiovascular Hemodynamics.

Jingjing Luo,Wei Chen,Yuzhu Guo,Junjie Zhen,Peng Zhou

doi:10.3390/s21030872

Abstract

Hemodynamic activities, as an essential measure of physiological and psychological characteristics, can be used for cardiovascular and cerebrovascular disease detection. Photoplethysmography imaging (iPPG) can be applied for such purposes with non-contact advances, however, most cardiovascular hemodynamics of iPPG systems are developed for laboratory research, which limits the application in pervasive healthcare. In this study, a video-based facial iPPG detecting equipment was devised to provide multi-dimensional spatiotemporal hemodynamic pulsations for applications with high portability and self-monitoring requirements. A series of algorithms have also been developed for physiological indices such as heart rate and breath rate extraction, facial region analysis, and visualization of hemodynamic pulsation distribution. Results showed that the new device can provide a reliable measurement of a rich range of cardiovascular hemodynamics. Combined with the advanced computing techniques, the new non-contact iPPG system provides a promising solution for user-friendly pervasive healthcare.

Highlights

Pervasive monitoring of cardiovascular health is attractive for both clinical and biomedical communities [1]
There is a shortage of userfriendly cardiovascular monitoring equipment which is informative with easy accessibility, allowing various health indices to be detected without knowing the detailed underlying mechanisms [2,3] for daily life healthcare. iPPG (Photoplethysmography Imaging) which is based on a non-contact and imaging technique [4,5,6], offers the public a potential solution for quick and smart self-monitoring, and is being increasingly used in such applications
The blue line was after a 1s window sliding-mean process, and the black line is the smooth signal obtained after passing through a 0.5~5 Hz bandpass filter

Summary

Introduction

Pervasive monitoring of cardiovascular health is attractive for both clinical and biomedical communities [1]. There is a shortage of userfriendly cardiovascular monitoring equipment which is informative with easy accessibility, allowing various health indices to be detected without knowing the detailed underlying mechanisms [2,3] for daily life healthcare. IPPG (Photoplethysmography Imaging) which is based on a non-contact and imaging technique [4,5,6], offers the public a potential solution for quick and smart self-monitoring, and is being increasingly used in such applications. The non-contact technology provides unconstrained blood volume pulse measurements for cardiovascular or microcirculation monitoring. Several physiological information, such as the blood oxygen saturation calculation [7], pulse transit time (PTT) [8], heart rate (HR) and its variability (HRV), can be obtained through analyzing of iPPG sig dxnals [9].

Methods

Results

Discussion

Conclusion