Digital image correlation for full-field time-resolved assesment of arterial stiffness

Pulse wave velocity (PWV) of the arterial system is a very important parameter to evaluate cardiovascular health. Currently, however, there is no golden standard for PWV measurement. In this work, DIC was used for full-field time-resolved assessment of displacement, velocity, acceleration and strains of the skin in the neck directly above the common carotid artery (CCA). By assessing these parameters, propagation of the pulse wave could be tracked, leading to a new method for PWV detection based on DIC. The method was tested on 5 healthy subjects. As a means of validation, PWV was measured with ultrasound (US)as well. Measured PWV values were between 3,68 m/s and 5,19 m/s as measured with DIC and between 5,14 and 6,58 m/s as measured with US, with a maximum absolute difference of 2,78 m/s between the two methods. DIC measurements of the neck region can serve as a test base for determining a robust strategy for PWV detection, they can serve as reference for 3D fluid-structure interaction (FSI) models, or they may even evolve into a screening method of their own. Moreover, full-field, time-resolved DIC can be adapted for other applications in biomechanics.status: publishe