K Sunderland1, M Wang2, A S Pandey3, J Gemmete4, Q Huang5, A Goudge1, J Jiang6,7. 1. Biomedical Engineering, Michigan Technological University, Houghton, MI, USA. 2. Department of Management Science and Statistics, The University of Texas at San Antonio, San Antonio, TX, USA. 3. Department of Neurosurgery, University of Michigan, Ann Arbor, MI, USA. 4. Department of Radiology, University of Michigan, Ann Arbor, MI, USA. 5. Department of Neurosurgery, Changhai Hospital, Shanghai, China. 6. Biomedical Engineering, Michigan Technological University, Houghton, MI, USA. jjiang1@mtu.edu. 7. Department of Biomedical Engineering, Michigan Technological University Mineral and Material Science and Engineering Building, Room 309 1400 Townsend Drive, Houghton, MI, 49931, USA. jjiang1@mtu.edu.
Abstract
BACKGROUND: Surgical intervention for unruptured intracranial aneurysms (IAs) carries inherent health risks. The analysis of "patient-specific" IA geometric and computational fluid dynamics (CFD) simulated wall shear stress (WSS) data has been investigated to differentiate IAs at high and low risk of rupture to help clinical decision making. Yet, outcomes vary among studies, suggesting that novel analysis could improve rupture characterization. The authors describe a CFD analytic method to assess spatiotemporal characteristics of swirling flow vortices within IAs to improve characterization. METHODS: CFD simulations were performed for 47 subjects harboring one medium-sized (4-10 mm) middle cerebral artery (MCA) aneurysm with available 3D digital subtraction angiography data. Alongside conventional indices, quantified IA flow vortex spatiotemporal characteristics were applied during statistical characterization. Statistical supervised machine learning using a support vector machine (SVM) method was run with cross-validation (100 iterations) to assess flow vortex-based metrics' strength toward rupture characterization. RESULTS: Relying solely on vortex indices for statistical characterization underperformed compared with established geometric characteristics (total accuracy of 0.77 vs 0.80) yet showed improvements over wall shear stress models (0.74). However, the application of vortex spatiotemporal characteristics into the combined geometric and wall shear stress parameters augmented model strength for assessing the rupture status of middle cerebral artery aneurysms (0.85). CONCLUSIONS: This preliminary study suggests that the spatiotemporal characteristics of flow vortices within MCA aneurysms are of value to improve the differentiation of ruptured aneurysms from unruptured ones.
BACKGROUND: Surgical intervention for unruptured intracranial aneurysms (IAs) carries inherent health risks. The analysis of "patient-specific" IA geometric and computational fluid dynamics (CFD) simulated wall shear stress (WSS) data has been investigated to differentiate IAs at high and low risk of rupture to help clinical decision making. Yet, outcomes vary among studies, suggesting that novel analysis could improve rupture characterization. The authors describe a CFD analytic method to assess spatiotemporal characteristics of swirling flow vortices within IAs to improve characterization. METHODS: CFD simulations were performed for 47 subjects harboring one medium-sized (4-10 mm) middle cerebral artery (MCA) aneurysm with available 3D digital subtraction angiography data. Alongside conventional indices, quantified IA flow vortex spatiotemporal characteristics were applied during statistical characterization. Statistical supervised machine learning using a support vector machine (SVM) method was run with cross-validation (100 iterations) to assess flow vortex-based metrics' strength toward rupture characterization. RESULTS: Relying solely on vortex indices for statistical characterization underperformed compared with established geometric characteristics (total accuracy of 0.77 vs 0.80) yet showed improvements over wall shear stress models (0.74). However, the application of vortex spatiotemporal characteristics into the combined geometric and wall shear stress parameters augmented model strength for assessing the rupture status of middle cerebral artery aneurysms (0.85). CONCLUSIONS: This preliminary study suggests that the spatiotemporal characteristics of flow vortices within MCA aneurysms are of value to improve the differentiation of ruptured aneurysms from unruptured ones.
Authors: Matthew N Gwilliam; Nigel Hoggard; David Capener; Pankaj Singh; Alberto Marzo; Prashant K Verma; Iain D Wilkinson Journal: J Cereb Blood Flow Metab Date: 2009-09-16 Impact factor: 6.200
Authors: Yiemeng Hoi; Bruce A Wasserman; Yuanyuan J Xie; Samer S Najjar; Luigi Ferruci; Edward G Lakatta; Gary Gerstenblith; David A Steinman Journal: Physiol Meas Date: 2010-01-20 Impact factor: 2.833