An improved panoramic digital image correlation method for vascular strain analysis and material characterization

Genovese, Katia; Lee, Y. U.; Lee, A. Y.; Humphrey, Jay D.

doi:10.1016/j.jmbbm.2012.11.015

Cited by 50 publications

(50 citation statements)

References 18 publications

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“…Multiple views were obtained by mounting a single camera on a special rig that accurately positioned the camera along a given viewing direction (e.g. along a line c inclined to the desired stereo-angle with respect to the axis z of the conical mirror; figure 2) and then allowed a rotation over 360 • to collect the required set of polar-symmetrical stereo views [7]. In particular, the camera was mounted on a large custom dual-axis translational stage that was fixed on a kinematic mount (figure 2).…”

Section: Methodsmentioning

confidence: 99%

“…Each view was inclined relative to the opposite one at a stereo-angle 2θ of about 8 • . Note that this p-DIC stereo-angle increases with the sample size, going from 2θ < 2 • for mouse arteries having a diameter of approximately 1 mm [4][5][6][7] to 2θ = 8-12…”

Section: (C) Image and Data Processingmentioning

confidence: 98%

“…The relatively large stereo-angle herein improved the accuracy of reconstruction of the radial coordinate r, because out-of-plane measurement accuracy (z-coordinate for standard DIC, r-coordinate for p-DIC) is a strong function of the stereo-angle [20]. Actually, when using 2θ ≥ 8 • , the reconstruction error on the stereo plane (see [7] for details) is almost unperceivable, thus two stereo views can be sufficient for three-dimensional measurement (i.e. a dual-fixed camera arrangement could have been used in this work).…”

Section: (C) Image and Data Processingmentioning

confidence: 99%

“…The specimen typically needs to be patterned in a random fashion to endow the surface with unique features that allow the tracking of sets of material points during deformation according to DIC area-based matching algorithms [18]. To obtain three-dimensional information, a fixed single camera captures information at different viewing angles (n view ≥ 4) by rotating a tilted flat mirror that is mounted at 45 • and placed between the conical mirror and the camera [7]. Data collection for this project required a modification of the original p-DIC set-up because of the size and the sac-like geometry of the gallbladder.…”

Section: Introductionmentioning

confidence: 99%

“…Data collection for this project required a modification of the original p-DIC set-up because of the size and the sac-like geometry of the gallbladder. Indeed, a new data-processing methodology was implemented to capture and merge the three-dimensional information gathered not only for the lateral surface, as in prior work [7], but also for the fundus. A schematic drawing of the experimental set-up is shown in figure 2.…”

Section: Introductionmentioning

confidence: 99%

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Digital image correlation-based point-wise inverse characterization of heterogeneous material properties of gallbladder in vitro

et al. 2014

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Continuing advances in mechanobiology reveal more and more that many cell types, especially those responsible for establishing, maintaining, remodelling or repairing extracellular matrix, are extremely sensitive to their local mechanical environment. Indeed, it appears that they fashion the extracellular matrix so as to promote a ‘mechanical homeostasis’. A natural corollary, therefore, is that cells will try to offset complexities in geometry and applied loads with heterogeneous material properties in order to render their local environment mechanobiologically favourable. There is a pressing need, therefore, for hybrid experimental–computational methods in biomechanics that can quantify such heterogeneities. In this paper, we present an approach that combines experimental information on full-field surface geometry and deformations with a membrane-based point-wise inverse method to infer full-field mechanical properties for soft tissues that exhibit nonlinear behaviours under finite deformations. To illustrate the potential utility of this new approach, we present the first quantification of regional mechanical properties of an excised but intact gallbladder, a thin-walled, sac-like organ that plays a fundamental role in normal digestion. The gallbladder was inflated to a maximum local stretch of 120% in eight pressure increments; at each pressure pause, the entire three-dimensional surface was optically extracted, and from which the surface strains were computed. Wall stresses in each state were predicted from the deformed geometry and the applied pressure using an inverse elastostatic method. The elastic properties of the gallbladder tissue were then characterized locally using point-wise stress–strain data. The gallbladder was found to be highly heterogeneous, with drastically different stiffness between the hepatic and the serosal sides. The identified material model was validated through forward finite-element analysis; both the configurations and the local stress–strain patterns were well reproduced.

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Section: Methodsmentioning

confidence: 99%

Section: (C) Image and Data Processingmentioning

confidence: 98%

Section: (C) Image and Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Digital image correlation-based point-wise inverse characterization of heterogeneous material properties of gallbladder in vitro

et al. 2014

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Uncertainty quantification in subject‐specific estimation of local vessel mechanical properties

Rego

Weiss

Bersi

et al. 2021

Numer Methods Biomed Eng

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Quantitative estimation of local mechanical properties remains critically important in the ongoing effort to elucidate how blood vessels establish, maintain, or lose mechanical homeostasis. Recent advances based on panoramic digital image correlation (pDIC) have made high‐fidelity 3D reconstructions of small‐animal (e.g., murine) vessels possible when imaged in a variety of quasi‐statically loaded configurations. While we have previously developed and validated inverse modeling approaches to translate pDIC‐measured surface deformations into biomechanical metrics of interest, our workflow did not heretofore include a methodology to quantify uncertainties associated with local point estimates of mechanical properties. This limitation has compromised our ability to infer biomechanical properties on a subject‐specific basis, such as whether stiffness differs significantly between multiple material locations on the same vessel or whether stiffness differs significantly between multiple vessels at a corresponding material location. In the present study, we have integrated a novel uncertainty quantification and propagation pipeline within our inverse modeling approach, relying on empirical and analytic Bayesian techniques. To demonstrate the approach, we present illustrative results for the ascending thoracic aorta from three mouse models, quantifying uncertainties in constitutive model parameters as well as circumferential and axial tangent stiffness. Our extended workflow not only allows parameter uncertainties to be systematically reported, but also facilitates both subject‐specific and group‐level statistical analyses of the mechanics of the vessel wall.

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Inverse material parameter estimation of patient‐specific finite element models at the carotid bifurcation: The impact of excluding the zero‐pressure configuration and residual stress

Johnston

Ghasemi

Lally

2022

Numer Methods Biomed Eng

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The carotid bifurcation experiences a complex loading environment due to its anatomical structure. Previous in-vivo material parameter estimation methods often use simplified model geometries, isotropic hyperelastic constitutive equations or neglect key aspects of the vessel, such as the zero-pressure configuration or residual stress, all of which have independently been shown to alter the stress environment of the vessel wall. Characterizing the location of high stress in the vessel wall has often been proposed as a potential indicator of structural weakness. However, excluding the afore-mentioned zero-pressure configura-

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An improved panoramic digital image correlation method for vascular strain analysis and material characterization

Cited by 50 publications

References 18 publications

Digital image correlation-based point-wise inverse characterization of heterogeneous material properties of gallbladder in vitro

Digital image correlation-based point-wise inverse characterization of heterogeneous material properties of gallbladder in vitro

Uncertainty quantification in subject‐specific estimation of local vessel mechanical properties

Inverse material parameter estimation of patient‐specific finite element models at the carotid bifurcation: The impact of excluding the zero‐pressure configuration and residual stress

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