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In Bed Contactless Cardiorespiratory Signals Monitoring Using Optical Fiber Interferometry

Abstract:

Monitoring of cardiac and respiratory activity results crucial in clinical settings. However, specific, expensive and usually wired devices are required, which results in cumbersome configurations. Therefore, there is a large research interest in the development of noninvasive monitoring systems. Some authors have proposed the use of fiber-optic speckle interferometry, enabling for contact-less patient monitoring. In this study, we exploited this technology, and explored the performance of different fiber-optic configurations, in combination with robust signal processing algorithms, for heart and respiratory rates estimation. Several configurations were tested, all of them resulting in very low estimation errors. A qualitative analysis revealed that our system can be suited to track fast changes in respiration, as well as the presence of apneas. Such a system might be useful for noninvasive patient monitoring, specially in overnight recordings (e.g., OSAS or AF) or specific scenarios, such as magnetic resonances.