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Abstract #2492

Quantification of Wall Shear Stress using Finite-Element Interpolations in Multidimensional Phase Contrast MR data of the Thoracic Aorta

Julio Sotelo 1,2 , Jess Urbina 3,4 , Ernesto Ortiz 5 , Cristian Tejos 3,6 , Israel Valverde 7,8 , Daniel E. Hurtado 5,9 , and Sergio Uribe 3,4

1 Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, Santiago, Chile, 2 Electrical Engineering, Pontificia Universidad Catolica de Chile, Santiago, Santiago, Chile, 3 Biomedical Imaging Center, Pontificia Universidad Catolica de Chile, Santiago, Chile, 4 Radiology, School of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile, 5 Structural Engineering, Pontificia Universidad Catolica de Chile, Santiago, Chile, 6 Electrical Engineering, Pontificia Universidad Catolica de Chile, Santiago, Chile, 7 Pediatric Cardiology Unit, Hospital Virgen del Rocio, Sevilla, Spain, 8 Division of Cardiovascular Physiology, Institute of Biomedicine Seville (IBIS), Hospital Universitario Virgen de Rocio/CSIC/University of Seville, Sevilla, Spain, 9 Biomedical Engineering Group, Pontificia Universidad Catolica de Chile, Santiago, Chile

We present a novel method for calculating the WSS distribution in the aorta based on finite-element interpolations. The velocity field obtained from PC-MRI data was interpolated using linear triangular finite-elements and the axial WSS vector was obtained from a global least-squares stress-projection method. We used a Poiseuille flow profile and data acquired in volunteers for evaluating the robustness of the method. Our results showed that the local WSS values were in good agreement with the theoretical Poiseuille values and observed significant difference in the volunteers study in comparison to previews reported methods.

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