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OBJECT The authors created a simple, broadly applicable classification of saccular intracranial aneurysms into three categories: sidewall (SW), sidewall with branching vessel (SWBV), and endwall (EW) according to the angiographically documented patterns of their parent arteries. Using computational flow dynamics analysis (CFDA) of simple models representing(More)
—To elucidate the observed current capacity behavior , a model is developed that takes into account heat transport through the entire carbon nanofiber interconnect test structure and breakdown location. The model also includes variations in contact location with the support material. The resulting predicted heat dissipation and current capacity are(More)
BACKGROUND AND PURPOSE We present a relatively simple approach that physicians can use to reconstruct cerebral vessels as 3D numerical grids or computational replicas. The method accurately duplicates their geometry to provide computer simulations of their blood flow. METHODS Initial images were obtained by using any medical imaging technique, such as MR(More)
We applied computational fluid dynamics (CFD) analysis to assess 3D digital subtraction angiography findings in a patient with a giant vertebrobasilar aneurysm to simulate and compare the consequences of left and right vertebral artery occlusion. The balloon occlusion test suggested that occlusion of the right vertebral artery is the better way to treat(More)
We applied computational fluid dynamic (CFD) analysis on the numerical grid of a 3D rotational digital subtraction angiogram obtained in a 22-year-old male patient, with an accidentally discovered vein of Galen malformation associated with single feeder aneurysm, to understand the flow pattern through the two aneurysms and improve our general understanding(More)
We study the performance and reliability of carbon nanofiber ͑CNF͒ interconnects under high-current stress by examining CNF breakdown for four test configurations, suspended/supported with/without tungsten deposition. The use of W is to improve the CNF-electrode contact. The supported cases show a larger current density just before breakdown than the(More)
A 48-year-old man with neurofibromatosis type 1 (NF1) presented with a right pleural effusion. A 3D computed tomography (CT) angiogram showed an aneurysm of the right 11th intercostal artery. He had no history of chest trauma so we diagnosed a spontaneous rupture of the aneurysm causing a massive effusion. We opened his pleural cavity and found lacerated(More)
BACKGROUND We have previously reported mid-term results of a study, which ended in January 2000, on the Bicarbon valve. The study concluded that the valve showed excellent clinical results, associated with a low incidence of valve-related complications. In the present study, the same patients were prospectively followed for an additional 5 years. METHODS(More)
A new 3D computer code can simulate the propagation of blast waves generated by explosive volcanic eruptions. The authors recently applied this code to an imaginary eruption of Mt. Fuji, and although the simulation still bears many assumptions and simplifications, its numerical results provide useful information regarding wave interactions with local ground(More)
In a carbon nanofiber ͑CNF͒-metal system such as a bridge between two gold electrodes, passing high current ͑current stressing͒ reduces the total resistance of the system ͑CNF resistance R CNF plus contact resistance R c ͒ by orders of magnitude. The role of current stressing is modeled as a reduction in the interfacial tunneling gap with transport(More)