title: Visualization of Venous Compliance of Superficial Veins Using Non-Contact Plethysmography Based on Digital Red-Green-Blue Images.
abstract: 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.
authors.affiliation: Faculty of Science, Division 2, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan. nakano.kazu@rs.tus.ac.jp.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nakano
authors.affiliation: Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan. 50015401127@st.tuat.ac.jp.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Aoki
authors.affiliation: Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan. ryoutasato7assuncao@gmail.com.
authors.forename: Ryota
authors.initials: R
authors.lastname: Satoh
authors.affiliation: 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. hiroyuki@isl.titech.ac.jp.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan. inishi@cc.tuat.ac.jp.
authors.forename: Izumi
authors.initials: I
authors.lastname: Nishidate
mesh_terms: D001808:Blood Vessels / Q000502:physiology; D006801:Humans; D010991:Plethysmography / Q000379:methods*; D014680:Veins / Q000502:physiology; D054556:Venous Thromboembolism / Q000503:physiopathology*
keywords: non-contact measurement; venous compliance; venous thromboembolism