REMOTE PULSE OXIMETRY IMAGING – FUNDAMENTALS AND APPLICATIONS
Keywords:
pulse oximetry, phothoplethysmography imaging, arterial blood oxygenation, tissue perfusion, functional perfusion mapping, human and animal studiesAbstract
The remote photoplethysmography imaging (PPGI) system is a camera-based monitoring device for non-contact analysis of skin perfusion allowing measurement of vital parameters, like heart rate and respiration rate. PPGI is based on the same principle as classic photoplethysmography (PPG), i.e. measurement of optical absorption and scattering properties of skin. Pulse oximetry is a well-established clinical application of PPG to determine arterial blood oxygenation and this has been adapted for use with the PPGI setup. We describe the theoretical correlation between the measurement results and expected level of oxygen saturation. The feasibility of the proposed system is demonstrated by confirming the theory with results from tests with human volunteers in a laboratory setting and in an operating theatre during an ongoing (clinical) animal trial. Compared with measurement devices based on skin contact, the PPGI offers several advantages. It allows unobtrusive remote measurement as well as evaluation of vital parameters with spatial resolution. Therefore, PPGI is particularly suited for long-term monitoring of freely selectable and potentially sensitive skin regions, e.g. for preterm neonates being cared for in an incubator.
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Copyright (c) 2017 Nikolai Blanik, Boudewijn Venema, Vladimir Blazek, Steffen Leonhardt
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