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AJNR - American Journal of Neuroradiology

Published ahead of print on July 3, 2008
doi: 10.3174/ajnr.A1180

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Wall Shear Stress on Ruptured and Unruptured Intracranial Aneurysms at the Internal Carotid Artery

L.-D. Jou^a, D.H. Lee^a, H. Morsi^a and M.E. Mawad^a

^a From the Department of Radiology, Baylor College of Medicine, Houston, Tex

View larger version (9K): [in this window] [in a new window]   Fig 1. Size (A) and aspect ratio (B) distributions of aneurysms

View larger version (56K): [in this window] [in a new window]   Fig 2. An example of how hemodynamic parameters are computed. A, Wall shear stress distribution. Wall shear stress is in newtons per square meter. Maximum wall shear is determined from the entire aneurysm region and is not limited to the ostium. B, Aneurysm surface is defined, and mean wall shear stress is the average of the wall shear over the entire aneurysm surface. C, The ostium is determined by a plane between the aneurysm and the parent artery, and the ostium area is calculated from the shaded region. D, The mean ostium shear is calculated from the average of wall shear around the circumference of the ostium. A similar procedure is used to determine the average wall shear for the parent artery. A variable wall shear stress is often found at the ostium.

View larger version (26K): [in this window] [in a new window]   Fig 3. Wall shear distribution for a ruptured anterior choroidal aneurysm. A, Exclusion of the anterior choroidal artery. B, One percent of the flow rate through the anterior choroidal artery. C–E, Five percent of the flow rate through the anterior choroidal artery (C), at systole (D) and at diastole (E). All wall shears are scaled so that the mean arterial wall shears are the same for all cases. Wall shear is on a logarithmic scale.

View larger version (32K): [in this window] [in a new window]   Fig 4. The wall shear stress distribution for 8 ruptured intracranial carotid aneurysms. The color is coded on a logarithmic scale.

View larger version (31K): [in this window] [in a new window]   Fig 5. The wall shear stress distribution for 18 unruptured intracranial carotid aneurysms. The color is coded on a logarithmic scale.

View larger version (7K): [in this window] [in a new window]   Fig 6. Mean wall shear (A) and maximal wall shear (B) at diastole versus the aneurysm surface area. The wall shear stress is in newtons per square meter. indicates wall shear; Max, maximal.