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      Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths.

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          Abstract

          The feasibility of bispectral imaging photoplethysmography (iPPG) system for clinical assessment of cutaneous microcirculation at two different depths is proposed. The iPPG system has been developed and evaluated for in vivo conditions during various tests: (1) topical application of vasodilatory liniment on the skin, (2) skin local heating, (3) arterial occlusion, and (4) regional anesthesia. The device has been validated by the measurements of a laser Doppler imager (LDI) as a reference. The hardware comprises four bispectral light sources (530 and 810 nm) for uniform illumination of skin, video camera, and the control unit for triggering of the system. The PPG signals were calculated and the changes of perfusion index (PI) were obtained during the tests. The results showed convincing correlations for PI obtained by iPPG530 nm and LDI at (1) topical liniment (r = 0.98) and (2) heating (r = 0.98) tests. The topical liniment and local heating tests revealed good selectivity of the system for superficial microcirculation monitoring. It is confirmed that the iPPG system could be used for assessment of cutaneous perfusion at two different depths, morphologically and functionally different vascular networks, and thus utilized in clinics as a cost-effective alternative to the LDI.

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          Author and article information

          Journal
          J Biomed Opt
          Journal of biomedical optics
          SPIE-Intl Soc Optical Eng
          1560-2281
          1083-3668
          Mar 2016
          : 21
          : 3
          Affiliations
          [1 ] University of Latvia, Department of Human and Animal Physiology, Faculty of Biology, Raina Boulevard 19, Riga LV-1586, Latvia.
          [2 ] University of Latvia, Institute of Atomic Physics and Spectroscopy, Skunu Street 4, Riga LV-1586, Latvia.
          [3 ] Hospital of Traumatology and Orthopaedics, Duntes Street 29, Riga LV-1005, Latvia.
          Article
          2511237
          10.1117/1.JBO.21.3.035005
          27027825
          0de431dc-b551-4802-9635-f929763b1349
          History

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