Camera-based assessment of arterial stiffness and wave reflection parameters from neck micro-motion

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The feasibility of camera-based extraction of the carotid distension waveforms offers the prospect of a user-friendly alternative to Laser Doppler Velocimetry (LDV) or accelerometry-based systems. Upon supplementary calibration of vessel wall displacement to arterial pressure, our system may also be an appealing alternative to applanation tonometry for extracting cardiac-related features from the central pulse pressure waveform. This paper describes the application of camera-based micro-motion imaging to extract health-related features from the contour of the carotid displacement waveform. We build on the assumption that the cardiac-related frequency components of the skin motion (sMOT) waveform, as acquired at the vicinity of the carotid artery under uneven illumination, receive a dominant contribution from the carotid wall displacement. We propose a two-step approach at which sMOT signals are queried based on the local amplitude of remote-photoplethysmography (rPPG) sensors spanning the neck's skin and then ensemble-averaged for cardiovascular health assessment. The feasibility of the system is demonstrated for assessing stiffness index, augmentation pressure, augmentation index and reflection magnitude on a dataset comprising 28 participants (ages 23 to 62 yrs; 22 males). Although presented here as a standalone system, micro-motion imaging can be an auxiliary technique for improving sensor placement and signal quality of tonometric or LDV technologies.
Originele taal-2Engels
Artikelnummer1576
Pagina's (van-tot)1576-1598
Aantal pagina's23
TijdschriftPhysiological Measurement
Volume38
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 28 jul 2017

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