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22 February 2011 Detection of physiological changes after exercise via a remote optophysiological imaging system
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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 time-dependent 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 opto-physiological 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.
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Yu Sun, Sijung Hu, Vicente Azorin-Peris, Jia Zheng, Stephen Greenwald, Jonathon Chambers, and Yisheng Zhu "Detection of physiological changes after exercise via a remote optophysiological imaging system", Proc. SPIE 7891, Design and Quality for Biomedical Technologies IV, 78910E (22 February 2011); https://doi.org/10.1117/12.872723
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