Berggren Caleb C, Jack Wang Y F, Sigler Amanda M F, Timmins Lucas H
Department of Biomedical Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA; School of Engineering Medicine, Texas A&M University, Houston, TX 77030, USA.
J Biomech. 2025 Jun;187:112689. doi: 10.1016/j.jbiomech.2025.112689. Epub 2025 Apr 12.
Arterial tissues are subjected to mechanical loads that influence biological mechanisms in health and disease. Motivated by these observations, computational models to predict the vascular mechanical environment are increasingly being developed and applied. However, few computational vascular biomechanics studies are evaluated for accuracy. This study aimed to compare the transmural strain fields in healthy vascular tissue under physiologic loading between 3D intravascular ultrasound (IVUS)-based finite element (FE) models and image-based experimental measurements. IVUS image data were captured along a ∼ 15 mm segment in porcine carotid arteries (n = 3) in the reference configuration (∼10 mmHg) and at five axial positions under varied pressure loads. FE models were constructed from the full-length segment IVUS data, and model-predicted strains were determined using reported soft and stiff material properties for porcine tissue. Experimental strains were determined at each axial slice across the applied loads using a deformable image registration technique (Hyperelastic Warping). Both FE-predicted and experimental deformations exhibited non-linear behavior under loading, as observed in the material response curves. Following Warping parameter selection, results demonstrated that FE-predicted transmural strains with soft and stiff material properties bounded the experimentally-derived data at systolic pressures; however, sample variability was observed. At systolic pressure, Warping-derived and FE-predicted transmural strains showed good agreement, as RMSE values were < 0.09 and differences < 0.08. In conclusion, this study presents an experimental framework to assess accuracy in IVUS-based FE models, and results indicate that the computational framework can predict realistic deformations of arterial tissue; however, the accuracy strongly depends on tissue-specific material properties.
动脉组织承受着影响健康和疾病生物机制的机械负荷。受这些观察结果的推动,用于预测血管力学环境的计算模型正越来越多地被开发和应用。然而,很少有计算血管生物力学研究进行准确性评估。本研究旨在比较基于三维血管内超声(IVUS)的有限元(FE)模型与基于图像的实验测量结果在生理负荷下健康血管组织中的跨壁应变场。在参考构型(约10 mmHg)下以及在不同压力负荷下的五个轴向位置,沿着猪颈动脉中约15 mm的节段采集IVUS图像数据(n = 3)。从全长节段IVUS数据构建有限元模型,并使用报道的猪组织软、硬材料特性确定模型预测的应变。使用可变形图像配准技术(超弹性变形)在施加负荷的每个轴向切片上确定实验应变。如材料响应曲线所示,有限元预测和实验变形在负荷下均表现出非线性行为。在选择变形参数后,结果表明,具有软、硬材料特性的有限元预测跨壁应变在收缩压时界定了实验得出的数据;然而,观察到样本变异性。在收缩压时,变形得出的和有限元预测的跨壁应变显示出良好的一致性,因为均方根误差值<0.09且差异<0.08。总之,本研究提出了一个评估基于IVUS有限元模型准确性的实验框架,结果表明该计算框架可以预测动脉组织的实际变形;然而,准确性强烈依赖于组织特异性材料特性。
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