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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Medical Imaging
ST 5.1: Vortrag
Dienstag, 16. März 2021, 16:00–16:15, STa
Numerical modeling helps patient-specific stent implantation for aortic coarctation — •Dandan Ma1,3, Yong Wang2,3, Mueed Azhar1, Ansgar Adler1,3, Michael Steinmetz1, and Dandan Ma1,3 — 1University Medical Center Göttingen, 37075 Göttingen, Germany — 2MPI for Dynamics and Self-Organization, 37077 Göttingen, Germany — 3German Center for Cardiovascular Research (DZHK), Partner Site Göttingen, Germany
The coarctation of aorta (CoA, a local narrowing of the aortic arch) usually happens as a birth defect, interventional surgery has been considered as the treatment for re-coarctation. However the surgery procedure is usually carried out based on the doctor's experience and thus may lack of theoretical evaluation. In this study, we used visual stent planning to predict the deformed aortic geometry, based on the patient aortic geometry which was segmented and reconstructed from magnetic resonance image (MRI). We then used the lattice Boltzmann method to simulate the flows within undeformed and deformed aorta separately. Flow information from phase-contrast MRI (PC-MRI) measurements was used as boundary conditions. Both large eddy simulation (LES) and direct numerical simulation (DNS) were adopted to resolve the blood flow. Numerical results such as flow velocity, pressure drop and wall shear stress (WSS) were obtained. After comparison of the flow from LES, DNS and PC-MRI, we concluded that LES can obtain accurate aortic flow within acceptable simulation time. The numerical modeling is expected to improve the understanding of blood flow and to aid the Interventional therapy.