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AJNR - American Journal of Neuroradiology

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Correlation between Lumenal Geometry Changes and Hemodynamics in Fusiform Intracranial Aneurysms

Liang-Der Jou^a, Gregory Wong^a, Brad Dispensa^c, Michael T. Lawton^b, Randall T. Higashida^a,b,c,d, William L. Young^b,c,d and David Saloner^a

^a Department of Radiology, University of California–San Francisco, San Francisco, CA
^b Department of Neurological Surgery, University of California–San Francisco, San Francisco, CA
^c Department of Anesthesia and Perioperative Care, University of California–San Francisco, San Francisco, CA
^d Department of Neurology, University of California–San Francisco, San Francisco, CA

View larger version (131K): [in a new window]   FIG 1. MIPS images of a stable and growing aneurysm.

View larger version (65K): [in a new window]   FIG 2. Models of the stable (A) and the growing (B) aneurysm.

View larger version (22K): [in a new window]   FIG 3. A, Wall shear stress distribution (N/m2). B, Streamlines in the stable aneurysm. C, Pressure on the aneurysm (mmHg).

View larger version (16K): [in a new window]   FIG 4. A, Change of aneurysm geometry in 2 years (m). The red indicates the location and magnitude of growth. B, The inverse of wall shear stress (1/[N/m2]). C, Pressure distribution on the surfaces of the aneurysm and vessels (mmHg). Mean pressure was assumed to be 100 mmHg.

View larger version (21K): [in a new window]   FIG 5. Histograms of the wall shear stress for the growing (G) and the stable (S) aneurysm under steady flow. The wall shear stress distributions at 2 different times (2002 and 2003) are shown for the growing aneurysm.

View larger version (55K): [in a new window]   FIG 6. Influence of pulsatility on the wall shear stress distribution for the stable (A) and the growing (B) aneurysm. Colors indicate the level of wall shear to which the aneurysm wall is subjected.