Inverse identification of local stiffness across ascending thoracic aortic aneurysms

Biomechanics and Modeling in Mechanobiology
Solmaz FarzanehS Avril

Abstract

Aortic dissection is the most common catastrophe of the thoracic aorta, with a very high rate of mortality. Type A dissection is often associated with an ascending thoracic aortic aneurysm (ATAA). However, it is widely acknowledged that the risk of type A dissection cannot be reliably predicted simply by measuring the ATAA diameter and there is a pressing need for more reliable risk predictors. It was previously shown that there is a significant correlation between a rupture criterion based on the ultimate stretch of the ATAA and the local extensional stiffness of the aorta. Therefore, reconstructing regional variations of the extensional stiffness across the aorta appears highly important. In this paper, we present a novel noninvasive inverse method to identify the patient-specific local extensional stiffness of aortic walls based on preoperative gated CT scans. Using these scans, a structural mesh is defined across the aorta with a set of nodes attached to the same material points at different time steps throughout the cardiac cycle. For each node, time variations of the position are analyzed using Fourier series, permitting the reconstruction of the local strain distribution (fundamental term). Relating these strains to tens...Continue Reading

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Citations

Apr 16, 2019·Journal of Biomechanical Engineering·Bart Spronck, Jay Humphrey
Jan 24, 2019·Annals of Biomedical Engineering·Solmaz FarzanehStéphane Avril
Dec 22, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Xuehuan HeJia Lu
Mar 5, 2021·Journal of Biomechanics·Marzio Di GiuseppeStéphane Avril
Mar 23, 2021·Biomedical Engineering Letters·Albert ComelliSalvatore Pasta

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