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    Stereoscopically Observed Deformations of a Compliant Abdominal Aortic Aneurysm Model

    Source: Journal of Biomechanical Engineering:;2011:;volume( 133 ):;issue: 011::page 111004
    Author:
    Clark A. Meyer
    ,
    Eric Bertrand
    ,
    Olivier Boiron
    ,
    Valérie Deplano
    DOI: 10.1115/1.4005416
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A new experimental setup has been implemented to precisely measure the deformations of an entire model abdominal aortic aneurysm (AAA). This setup addresses a gap between the computational and experimental models of AAA that have aimed at improving the limited understanding of aneurysm development and rupture. The experimental validation of the deformations from computational approaches has been limited by a lack of consideration of the large and varied deformations that AAAs undergo in response to physiologic flow and pressure. To address the issue of experimentally validating these calculated deformations, a stereoscopic imaging system utilizing two cameras was constructed to measure model aneurysm displacement in response to pressurization. The three model shapes, consisting of a healthy aorta, an AAA with bifurcation, and an AAA without bifurcation, were also evaluated with computational solid mechanical modeling using finite elements to assess the impact of differences between material properties and for comparison against the experimental inflations. The device demonstrated adequate accuracy (surface points were located to within 0.07 mm) for capturing local variation while allowing the full length of the aneurysm sac to be observed at once. The experimental model AAA demonstrated realistic aneurysm behavior by having cyclic strains consistent with reported clinical observations between pressures 80 and 120 mm Hg. These strains are 1–2%, and the local spatial variations in experimental strain were less than predicted by the computational models. The three different models demonstrated that the asymmetric bifurcation creates displacement differences but not cyclic strain differences within the aneurysm sac. The technique and device captured regional variations of strain that are unobservable with diameter measures alone. It also allowed the calculation of local strain and removed rigid body motion effects on the strain calculation. The results of the computations show that an asymmetric aortic bifurcation created displacement differences but not cyclic strain differences within the aneurysm sac.
    keyword(s): Pressure , Deformation , Motion , Bifurcation , Inflationary universe , Shapes , Aneurysms , Calibration , Stress , Displacement , Thickness , Aorta , Rupture , Dimensions , Flow (Dynamics) AND Imaging ,
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      Stereoscopically Observed Deformations of a Compliant Abdominal Aortic Aneurysm Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/145350
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    • Journal of Biomechanical Engineering

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    contributor authorClark A. Meyer
    contributor authorEric Bertrand
    contributor authorOlivier Boiron
    contributor authorValérie Deplano
    date accessioned2017-05-09T00:42:18Z
    date available2017-05-09T00:42:18Z
    date copyrightNovember, 2011
    date issued2011
    identifier issn0148-0731
    identifier otherJBENDY-27227#111004_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/145350
    description abstractA new experimental setup has been implemented to precisely measure the deformations of an entire model abdominal aortic aneurysm (AAA). This setup addresses a gap between the computational and experimental models of AAA that have aimed at improving the limited understanding of aneurysm development and rupture. The experimental validation of the deformations from computational approaches has been limited by a lack of consideration of the large and varied deformations that AAAs undergo in response to physiologic flow and pressure. To address the issue of experimentally validating these calculated deformations, a stereoscopic imaging system utilizing two cameras was constructed to measure model aneurysm displacement in response to pressurization. The three model shapes, consisting of a healthy aorta, an AAA with bifurcation, and an AAA without bifurcation, were also evaluated with computational solid mechanical modeling using finite elements to assess the impact of differences between material properties and for comparison against the experimental inflations. The device demonstrated adequate accuracy (surface points were located to within 0.07 mm) for capturing local variation while allowing the full length of the aneurysm sac to be observed at once. The experimental model AAA demonstrated realistic aneurysm behavior by having cyclic strains consistent with reported clinical observations between pressures 80 and 120 mm Hg. These strains are 1–2%, and the local spatial variations in experimental strain were less than predicted by the computational models. The three different models demonstrated that the asymmetric bifurcation creates displacement differences but not cyclic strain differences within the aneurysm sac. The technique and device captured regional variations of strain that are unobservable with diameter measures alone. It also allowed the calculation of local strain and removed rigid body motion effects on the strain calculation. The results of the computations show that an asymmetric aortic bifurcation created displacement differences but not cyclic strain differences within the aneurysm sac.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleStereoscopically Observed Deformations of a Compliant Abdominal Aortic Aneurysm Model
    typeJournal Paper
    journal volume133
    journal issue11
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.4005416
    journal fristpage111004
    identifier eissn1528-8951
    keywordsPressure
    keywordsDeformation
    keywordsMotion
    keywordsBifurcation
    keywordsInflationary universe
    keywordsShapes
    keywordsAneurysms
    keywordsCalibration
    keywordsStress
    keywordsDisplacement
    keywordsThickness
    keywordsAorta
    keywordsRupture
    keywordsDimensions
    keywordsFlow (Dynamics) AND Imaging
    treeJournal of Biomechanical Engineering:;2011:;volume( 133 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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