Humphreys, Kenneth and Markham, Charles and Ward, Tomas
A CMOS camera-based system for clinical photoplethysmographic
Proceedings of SPIE, 5823.
In this work an-image based photoplethysmography (PPG) system is developed and tested against a conventional fingerbased
system as commonly used in clinical practise. A PPG is essentially an optical instrument consisting of a near
infrared (NIR) source and detector that is capable of tracking blood flow changes in body tissue. When used with a
number of wavelengths in the NIR band blood oxygenation changes as well as other blood chemical signatures can be
ascertained yielding a very useful device in the clinical realm. Conventionally such a device requires direct contact with
the tissue under investigation which eliminates the possibility of its use for applications like wound management where
the tissue oxygenation measurement could be extremely useful. To circumnavigate this shortcoming we have developed
a CMOS camera-based system, which can successfully extract the PPG signal without contact with the tissue under
investigation. A comparison of our results with conventional techniques has yielded excellent results.
||Optical Tissue Imaging, near infrared spectroscopy, non-invasive physiological measurement,
photoplethysmography, image processing.
||Science & Engineering > Electronic Engineering
Dr Tomas Ward
||13 May 2009 11:43
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||Proceedings of SPIE
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