Association of remote imaging photoplethysmography and cutaneous perfusion in volunteers

Figures

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  Figure 1. Representation of the congruent (left) and incongruent Stroop test with matching or different colour and meaning of the target word.

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  Figure 2. Outline of the study protocol.

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  Figure 3. ROI definition algorithm. See text for details.

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  Figure 4. Exemplary imaging plethysmogram recorded at subjects´ forehead at rest (left) and after the Heat test (right). The top rows show the raw iPPG signal derived from light reflection in the green color channel, the middle the processed AC component and the bottom the DC component. An upward shift in the mean intensity and an increase in the AC component along with Heat test are clearly discernible.

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  Figure 5. Correlation for PI response \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta PI}_{Z}$$\end{document}ΔPIZ to Flux response \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta Flux}_{Z}$$\end{document}ΔFluxZ at each study intervention (values normalized).