Coupled Simulation of Hemodynamics and Vascular Growth and Remodeling in a Subject-Specific Geometry.

Coupled Simulation of Hemodynamics and Vascular Growth and Remodeling in a Subject-Specific Geometry.
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DOI:
10.1007/s10439-015-1287-6
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发表时间:
2015-07
影响因子:
3.8
通讯作者:
Shadden SC
Shadden SC
中科院分区:
工程技术2区
文献类型:
--
作者:
Wu J;Shadden SC

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提出了一种计算框架,用于将血管生长和重塑 (G&R) 与 3D 患者特定几何形状中的血流模拟相结合。血管壁材料考虑了超弹性和各向异性特性,并使用约束混合模型来表示血管壁中的多种成分,血管壁被建模为膜。耦合模拟分为两个时间尺度——较长的时间尺度用于 G&R,较短的时间尺度用于流体动力学模拟。 G&R 被模拟以演化流体域的边界,而流体模拟又被用来生成调节 G&R 的壁剪切应力和跨壁压力数据。为了最大限度地减少所需的计算成本,仅当 G&R 引起显着的血管几何变化时才模拟流体动力学。为了进行演示,该耦合模型用于研究应力介导的生长参数和血流力学对源自医学图像数据的肾下主动脉模型中血管组织生长行为的影响。
A computational framework to couple vascular growth and remodeling (G&R) with blood flow simulation in a 3D patient-specific geometry is presented. Hyperelastic and anisotropic properties are considered for the vessel wall material and a constrained mixture model is used to represent multiple constituents in the vessel wall, which was modeled as a membrane. The coupled simulation is divided into two time scales–a longer time scale for G&R and a shorter time scale for fluid dynamics simulation. G&R is simulated to evolve the boundary of the fluid domain, and fluid simulation is in turn used to generate wall shear stress and transmural pressure data that regulates G&R. To minimize required computation cost, the fluid dynamics are only simulated when G&R causes significant vascular geometric change. For demonstration, this coupled model was used to study the influence of stress-mediated growth parameters, and blood flow mechanics, on the behavior of the vascular tissue growth in a model of the infrarenal aorta derived from medical image data.
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