Strain field measurements on mouse carotid arteries using microscopic three‐dimensional digital image correlation

Abstract

In this work, we use the vapor‐sorption equilibrium data to show the degree of solvent upturn in each solvent‐polymer system. For this purpose, 20 isothermal data sets for five polymer + solvent binaries have been used in the temperature range of 298–413 K. Solvents studied are benzene, pentane, hexane, toluene, and chlorobenzene. Homopolymers studied are: polystyrene, poly(vinyl acetate), polyisobutylene, and polyethylene. According to these data sets, solvent weight fraction in the polymer is plotted against solvent vapor activity that is calculated assuming an ideal gas phase of pure solvent vapor neglecting the vapor pressure of the polymer. We use the Flory‐Huggins theory to obtain dimensionless interaction parameter, χ. Also the Zimm‐Lundberg clustering theory and non‐ideality thermodynamic factor, Γ are used to interpret the equilibrium data. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

Accurate assessment of carotid artery stenosis in atherosclerotic mice using accelerated high-resolution 3D magnetic resonance angiography

“…These values were found in good agreement with values for the mouse common carotid artery described in the literature: vessel diameters in the range of 0.45-0.55 mm have been reported from studies using B-mode ultrasound imaging, which correspond to cross-sectional areas between 0.16 and 0.24 mm 2 [20]. In line with this are values reported from a study using carotid specimen with diameters of 0.40 mm with measurements taken more distally when compared to our study [21]. Similar vascular diameters have been measured in unaffected common carotid arteries of C57BL/6J and ApoE −/− mice with values of 0.447 ± 0.007 and 0.454 ± 0.013 mm, respectively, corresponding to lumen areas of 0.16 mm 2 each [22].…”

Error Assessment in Stereo-based Deformation Measurements

“…Of particular interest are the trends in each component of motion. 6 First, for motion nominally in the object plane and in the x-direction (see Fig. 1), variability is strongly parabolic with horizontal distance from point O in Fig.…”

“…[1][2][3][4][5][6]. For 2D applications, where motion occurs primarily in a plane, the method is typically employed by matching image subsets between undeformed and deformed configurations to extract full-field displacements and strains.…”

Anisotropic and hyperelastic identification of in vitro human arteries from full-field optical measurements

“…The implementation of a similar approach for arteries is possible but it will require that the spatial resolution is adapted to the length scale of local variations of the material properties. This may be achieved by employing 3-D digital image correlation, as shown in Sutton et al (2007).…”

“…The combination of 3-D deformation measurements (Rastogi, 1999;Foster, 1978;Viotti et al, 2008;Matthys et al, 1991;Genovese, 2007Genovese, , 2009Sutton et al, 2007) and inverse approaches is now very common in solid mechanics but it is still under-employed for identifying the anisotropic hyperelastic properties of the arterial tissues (Seshaiyer and Humphrey, 2003;Einstein et al, 2005). Moreover, the virtual fields method (Gré diac et al, 2006), 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 (Gré diac et al, 2006), robustness (Avril et al, 2004), fast convergence (Avril and Pierron, 2007).…”