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Title: Detection of physiological changes after exercise via a remote optophysiological imaging system
Authors: Sun, Yu
Hu, Sijung
Azorin-Peris, Vicente
Zheng, Jia
Greenwald, Stephen
Chambers, Jonathon
Zhu, Yisheng
Keywords: Photoplethysmography
Opto-physiological imaging (OPI)
Time-frequency representation (TFR)
Blood perfusion mapping
Physiological variables
Bland Altman plots
Pseudo-Wigner-Ville distribution (SPWVD)
Issue Date: 2011
Publisher: © SPIE
Citation: SUN, Y. ... et al., 2011. Detection of physiological changes after exercise via a remote optophysiological imaging system. Proceedings of SPIE, 7891, DOI: 10.1117/12.872723.
Abstract: A study of blood perfusion mapping was performed with a remote opto-physiological imaging (OPI) system coupling a sensitive CMOS camera and a custom-built resonant cavity light emitting diode (RCLED) ringlight. The setup is suitable for the remote assessment of blood perfusion in tissue over a wide range of anatomical locations. The purpose of this study is to evaluate the reliability and stability of the OPI system when measuring a cardiovascular variable of clinical interest, in this case, heart rate. To this end, the non-contact and contact photoplethysmographic (PPG) signals obtained from the OPI system and conventional PPG sensor were recorded simultaneously from each of 12 subjects before and after 5-min of cycling exercise. The time-frequency representation (TFR) method was used to visualize the timedependent behavior of the signal frequency. The physiological parameters derived from the images captured by the OPI system exhibit comparable functional characteristics to those taken from conventional contact PPG pulse waveform measurements in both the time and frequency domains. Finally and more importantly, a previously developed optophysiological model was employed to provide a 3-D representation of blood perfusion in human tissue which could provide a new insight into clinical assessment and diagnosis of circulatory pathology in various tissue segments.
Description: © 2011 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Version: Published
DOI: 10.1117/12.872723
URI: https://dspace.lboro.ac.uk/2134/22180
Publisher Link: http://dx.doi.org/10.1117/12.872723
ISBN: 9780819484284
ISSN: 0277-786X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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