The impact of shape uncertainty on aortic-valve pressure-drop computations
| Autor: | M. J. M. M. Hoeijmakers, Mcm Marcel Rutten, Wouter Huberts, F.N. van de Vosse |
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| Přispěvatelé: | RS: Carim - H07 Cardiovascular System Dynamics, Biomedische Technologie, Eindhoven MedTech Innovation Center, Cardiovascular Biomechanics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
uncertainty quantification
Computation MODELS Biomedical Engineering SEGMENTATION aortic valve stenosis computational fluid dynamics Computational fluid dynamics Cardiovascular STENOSIS meta-modeling ECHOCARDIOGRAPHIC-ASSESSMENT GLOBAL SENSITIVITY INDEXES sensitivity analysis FRACTIONAL FLOW RESERVE Humans Segmentation Arterial Pressure Sensitivity (control systems) Uncertainty quantification Closing (morphology) Molecular Biology Mathematics Pressure drop BLOOD-FLOW business.industry Applied Mathematics FLUID-DYNAMICS Models Cardiovascular Mode (statistics) Uncertainty Hemodynamics QUANTIFICATION RECOVERY Aortic Valve/diagnostic imaging Computational Theory and Mathematics Aortic Valve Modeling and Simulation business Algorithm Software statistical shape modeling CT |
| Zdroj: | International Journal for Numerical Methods in Biomedical Engineering, 37(10):e3518. Wiley-Blackwell |
| ISSN: | 2040-7947 2040-7939 |
| Popis: | Patient-specific image-based computational fluid dynamics (CFD) is widely adopted in the cardiovascular research community to study hemodynamics, and will become increasingly important for personalized medicine. However, segmentation of the flow domain is not exact and geometric uncertainty can be expected which propagates through the computational model, leading to uncertainty in model output. Seventy-four aortic-valves were segmented from computed tomography images at peak systole. Statistical shape modeling was used to obtain an approximate parameterization of the original segmentations. This parameterization was used to train a meta-model that related the first five shape mode coefficients and flowrate to the CFD-computed transvalvular pressure-drop. Consequently, shape uncertainty in the order of 0.5 and 1.0 mm was emulated by introducing uncertainty in the shape mode coefficients. A global variance-based sensitivity analysis was performed to quantify output uncertainty and to determine relative importance of the shape modes. The first shape mode captured the opening/closing behavior of the valve and uncertainty in this mode coefficient accounted for more than 90% of the output variance. However, sensitivity to shape uncertainty is patient-specific, and the relative importance of the fourth shape mode coefficient tended to increase with increases in valvular area. These results show that geometric uncertainty in the order of image voxel size may lead to substantial uncertainty in CFD-computed transvalvular pressure-drops. Moreover, this illustrates that it is essential to assess the impact of geometric uncertainty on model output, and that this should be thoroughly quantified for applications that wish to use image-based CFD models. |
| Databáze: | OpenAIRE |
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