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Sensors 2016, 16(12), 1996;

Visualization of Venous Compliance of Superficial Veins Using Non-Contact Plethysmography Based on Digital Red-Green-Blue Images

Faculty of Science, Division 2, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
Laboratory for Future Interdisciplinary Research of Science and Technology, Institute of Innovative Research, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
Author to whom correspondence should be addressed.
Academic Editors: Changzhi Li, Roberto Gómez-García and José-María Muñoz-Ferreras
Received: 4 September 2016 / Revised: 2 November 2016 / Accepted: 19 November 2016 / Published: 25 November 2016
(This article belongs to the Special Issue Non-Contact Sensing)
Full-Text   |   PDF [7261 KB, uploaded 25 November 2016]   |  


We propose the visualization of venous compliance (VC) using a digital red-green-blue (RGB) camera. The new imaging method, which transforms RGB values into VC, combines VC evaluation with blood concentration estimation from the RGB values of each pixel. We evaluate a non-contact plethysmography (NCPG) system for VC based on comparisons with conventional strain gauge plethysmography (SPG). We conduct in vivo measurements using both systems and investigate their differences by evaluating the VC. The results show that the two methods measure different blood vessels and that errors caused by interstitial fluid accumulation are negligible for the NCPG system, whereas SPG is influenced by such errors. Additionally, we investigate the relationship between VC and physical activity using NCPG. View Full-Text
Keywords: venous compliance; non-contact measurement; venous thromboembolism venous compliance; non-contact measurement; venous thromboembolism

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Nakano, K.; Aoki, Y.; Satoh, R.; Suzuki, H.; Nishidate, I. Visualization of Venous Compliance of Superficial Veins Using Non-Contact Plethysmography Based on Digital Red-Green-Blue Images. Sensors 2016, 16, 1996.

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