A video-optical system for time-resolved whole-body measurement on vascular segments

Inverse methods for characterizing the anisotropic hyperelastic behaviour of arteries in vitro

“…The entire experimental setup used in this study was presented in [6]. The sample was mounted on the in vitro rig and preconditioned via 8 pressurization cycles from p = 0 to p = 80 mmHg (10.5 kPa) and then 8 cycles of axial stretching from L/L 0 = 1 to L/L 0 = 1.4.…”

“…1). The optical measurement method was presented in [6]. It provides a point-wise evaluation of Ψ t at all the points where a marker has been bonded.…”

“…It provides a point-wise evaluation of Ψ t at all the points where a marker has been bonded. Accuracy of the measurement in terms of displacement magnitude is estimated to 0.17 mm [6].…”

“…The combination of 3-D deformation measurements [1][2][3][4][5][6][7] and inverse approaches [8] is now very common in solid mechanics but it is still under-employed for identifying the anisotropic hyperelastic properties of the arterial tissues [9,10]. Moreover, the Virtual Fields Method [11], which is an inverse method specifically dedicated to full-field data, has never been used for the mechanical identification of arterial tissues although it has very relevant assets: insensitivity to the uncertainty of boundary conditions [11], robustness [12], fast convergence [13].…”

Nondestructive mechanical characterization of developing biological tissues using inflation testing

“…US imaging is key to this setup, as it allows for measurements of the tissue deformation during bulge testing, a test that can now be performed inside the bioreactor. Previous studies have typically measured the tissue deformation during bulging using stereo camera setups [19,21,22,23,37,39] or advanced optical rigs [18,40], which are incompatible with the limited view of samples insides a bioreactor. In contrast, US is able to measure throughout the tissue cross-section, and can therefore be easily mounted on top of a bioreactor.…”