title: Accurate measurement of the pulse wave delay with imaging photoplethysmography.
abstract: Assessment of the cardiovascular parameters using noncontact video-based or imaging photoplethysmography (IPPG) is usually considered as inaccurate because of strong influence of motion artefacts. To optimize this technique we performed a simultaneous recording of electrocardiogram and video frames of the face for 36 healthy volunteers. We found that signal disturbances originate mainly from the stochastically enhanced dichroic notch caused by endogenous cardiovascular mechanisms, with smaller contribution of the motion artefacts. Our properly designed algorithm allowed us to increase accuracy of the pulse-transit-time measurement and visualize propagation of the pulse wave in the facial region. Thus, the accurate measurement of the pulse wave parameters with this technique suggests a sensitive approach to assess local regulation of microcirculation in various physiological and pathological states.
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Kamshilin
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia.
authors.forename: Igor S
authors.initials: IS
authors.lastname: Sidorov
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia; Department of Neurology and Neurosurgery, Pavlov First Saint Petersburg State Medical University, St. Petersburg 197022, Russia.
authors.forename: Laura
authors.initials: L
authors.lastname: Babayan
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia.
authors.forename: Maxim A
authors.initials: MA
authors.lastname: Volynsky
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia; Department of Neurobiology, University of Eastern Finland, 70210 Kuopio, Finland; Laboratory of Neurobiology, Kazan Federal University, Kazan 7208, Russia.
authors.forename: Rashid
authors.initials: R
authors.lastname: Giniatullin
authors.affiliation: Department of Computer Photonics and Videomatics, ITMO University, St. Petersburg 197101, Russia; Department of Circulation Physiology, Federal Almazov North-West Medical Research Centre, St. Petersburg 197341, Russia.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Mamontov
keywords: (030.4280) Noise in imaging systems; (170.3880) Medical and biological imaging; (280.1415) Biological sensing and sensors