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 Lee^1,2, Jee-Hyun Cho³, Doosang Kim⁴, Sang Hyung Lee⁵, and Simon Song^1,2

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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