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Abstract #1992

Hemodynamics of Severely Stenosed Carotid Artery before and after Endarterectomy by 4D Flow MRI with a High Spatiotemporal Resolution

Don-Gwan An1, Seungbin Ko1, Jeesoo Lee1,2, Jee-Hyun Cho3, Doosang Kim4, Sang Hyung Lee5, and Simon Song1,2

1Dept. of Mechanical Engineering, Hanyang University, Seoul, Korea, Republic of, 2Institute of Nano Science and Technology, Hanyang University, Seoul, Korea, Republic of, 3Bioimaging Research Team, Korea Basic Science Institute, Cheongju, Korea, Republic of, 4Dept. of Thoracic and Cardio-vascular Surgery, Veterans Health Service Medical Center, Seoul, Korea, Republic of, 5Dept. of Neurosurgery, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea, Republic of

In vitro 4D flow MRI measurements were performed for patient-specific carotid artery phantoms subject to a pulsatile flow before and after carotid endarterectomy (CEA) to secure a high-spatiotemporal resolution of 0.35 mm and 0.025 sec. As a result, we observed that the flow rate ratio of internal carotid artery (ICA) to common carotid artery (CCA) was not recovered after CEA of a patch repair due to a large recirculation motion in the ICA bulb which blocks the flow into ICA. Detailed hemodynamics are presented along with normalized time-averaged wall shear stress (NTA|WSS|), oscillatory shear index (OSI), abnormal regions, etc.

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