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Intra-Aneurysmal Hemodynamics during the Growth of an Unruptured Aneurysm: In Vitro Study Using Longitudinal CT Angiogram Database

S. Tateshimaa, K. Tanishitab, H. Omurab, J.P. Villablancaa and F. Vinuelaa

a Division of Interventional Neuroradiology University of California, Los Angeles, Medical Center and David Geffen School of Medicine at UCLA, Los Angeles, California
b Department of System Design Engineering, Keio University Faculty of Science and Technology, Yokohama, Japan


Figure 1
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  		Fig 1. A, Volume-rendering 3D image of left MCA aneurysm, posteroanterior view, before growth. Arrow indicates outpouching (bleb) on the aneurysm dome. B, Volume-rendering 3D image of the same left MCA aneurysm, posteroanterior view, after growth of the aneurysm bleb (arrow). C, A silicon aneurysm model of the left MCA aneurysm before growth. D, A silicon aneurysm model of the left MCA aneurysm after growth.


Figure 2
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  		Fig 2. A and B, Intra-aneurysmal flow before growth. Alteration of flow-velocity structure (A) and vorticity mapping (B) during 1 cardiac cycle are presented on the midsagittal plane. C and D, Intra-aneurysmal flow after growth. Alteration of flow velocity structure (C) and vorticity mapping (D) during 1 cardiac cycle are presented on the corresponding midsagittal plane. Red and blue colors on vorticity mapping indicate counterclockwise and clockwise vortices, respectively; t indicates time.


Figure 3
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  		Fig 3. 3D surface data of the MCA aneurysm before growth and anteroposterior projection (A) and superoinferior projection (B), demonstrating multiple points at which the value of wall shear stress was obtained. 3D surface data of the MCA aneurysm after growth, anteroposterior projection (C) and superoinferior projection (D), demonstrating multiple points at which the value of wall shear stress was obtained.


Figure 4
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  		Fig 4. A, Graph showing the values of wall shear stress (WSS) at 20 points along the aneurysm wall indicated in Fig 3A. Points 3–15 are located in the enlarging area. B, Graph showing the values of wall shear stress at 16 points along the aneurysm wall indicated in Fig 3B. Points 5–14 are located in the enlarging area. C, Graph showing the values of wall shear stress at 20 points along the aneurysm wall indicated in Fig 3C. Points 3–15 are located in the enlarging area. D, Graph showing the values of wall shear stress at 13 points along the aneurysm wall indicated in Fig 3C. Points 4–11 are located in the enlarging area. Min indicates minimal flow phase; acc, acceleration phase; max, maximal flow phase; dec, deceleration phase.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X