20 February 2019RGB camera-based noncontact imaging of plethysmogram and spontaneous low-frequency oscillation in skin perfusion before and during psychological stress
Izumi Nishidate,1 Chihiro Tanabe,1 Daniel J. McDuff,2 Kazuya Nakano,3 Kyuichi Niizeki,4 Yoshihisa Aizu,5 Hideaki Haneishi3
1Tokyo Univ. of Agriculture and Technology (Japan) 2Microsoft Research (United States) 3Chiba Univ. (Japan) 4Yamagata Univ. (Japan) 5Muroran Institute of Technology (Japan)
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We investigated a non-contact imaging method to evaluate plethysmogram and vasomotion with a digital color camera. Monte Carlo simulation for light transport in skin tissue is used to specify a relation among the red-green-blue-values and hemoglobin contents. Applying the FFT band pass filters to each pixel of the sequential images for the total hemoglobin concentration along the time line, two-dimentional plethysmogram and vasomotion can be reconstructed. In vivo experiments with human skin before, during, and after auditory stimulation demonstrated the feasibility of the method to evaluate the activities of autonomic nervous systems.
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Izumi Nishidate, Chihiro Tanabe, Daniel J. McDuff, Kazuya Nakano, Kyuichi Niizeki, Yoshihisa Aizu, Hideaki Haneishi, "RGB camera-based noncontact imaging of plethysmogram and spontaneous low-frequency oscillation in skin perfusion before and during psychological stress," Proc. SPIE 10885, Optical Diagnostics and Sensing XIX: Toward Point-of-Care Diagnostics, 1088507 (20 February 2019); https://doi.org/10.1117/12.2509752