A CMOS camera-based system for clinical photoplethysmographic\ud applications

摘要

In this work an-image based photoplethysmography (PPG) system is developed and tested against a conventional fingerbased\udsystem as commonly used in clinical practise. A PPG is essentially an optical instrument consisting of a near\udinfrared (NIR) source and detector that is capable of tracking blood flow changes in body tissue. When used with a\udnumber of wavelengths in the NIR band blood oxygenation changes as well as other blood chemical signatures can be\udascertained yielding a very useful device in the clinical realm. Conventionally such a device requires direct contact with\udthe tissue under investigation which eliminates the possibility of its use for applications like wound management where\udthe tissue oxygenation measurement could be extremely useful. To circumnavigate this shortcoming we have developed\uda CMOS camera-based system, which can successfully extract the PPG signal without contact with the tissue under\udinvestigation. A comparison of our results with conventional techniques has yielded excellent results.