Ultrasound Evaluation of an Abdominal Aortic Fluid-Structure Interaction Model

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Abstract

Ultrasound measurements are used for evaluating biomechanics of the abdominal aorta (AA) predicted by a fluid- structure interaction (FSI) simulation model. FSI simulation models describe the complete arterial physiology by quantify- ing the mechanical response in the vessel wall caused by the percolating pulsating blood. But the predictability of FSI models needs validation for these to be usable for diagnostic purposes. Ultrasound measurements are suitable for such an evaluation as the wall displacement can be measured in vivo and compared to the wall displacement simulated in the FSI model. Spectral Doppler velocity data from 3 healthy male volunteers were used to construct inlet profiles for the FSI model. Simultaneously, wall movement was tracked and used for comparison to FSI model results. Ultrasound data were acquired using a scanner equipped with a research interface. The wall displacement was estimated by time shift estimation obtained from cross-correlation of signals to a fixed reference. The FSI model was constructed as a 2D axis- symmetric pipe with lumen diameter predicted by B-mode images from each volunteer. Visual comparison of wall displacement over 1 cardiac cycle show agreement except for 1 volunteer (Male, 23 yrs.). The magnitude of the displacement in simulation, u fsi , and in vivo , u iv , is within the same order of magnitude for the young ( u iv = 1 : 48 mm, u fsi = 1 : 12 mm) and middle-aged volunteer ( u iv = 0 : 783 mm, u fsi = 1 : 31 mm). For the elderly volunteer the simulated displacement ( u fsi = 0 : 975 10
Original languageEnglish
Title of host publicationProceedings of IEEE International Ultrasonics Symposium,
PublisherIEEE
Publication date2014
Pages2292-2295
ISBN (Print)9781479970490
DOIs
Publication statusPublished - 2014
Event2014 IEEE International Ultrasonics Symposium - Hilton Hotel, Chicago, IL, United States
Duration: 3 Sep 20146 Sep 2014

Conference

Conference2014 IEEE International Ultrasonics Symposium
LocationHilton Hotel
Country/TerritoryUnited States
CityChicago, IL
Period03/09/201406/09/2014

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