نتایج جستجو برای: penumbra system
تعداد نتایج: 2232435 فیلتر نتایج به سال:
Shadow mapping is a commonly used technique for generating hard shadows in real time. However, existing shadow map based algorithms cannot render full soft shadows penumbras onto arbitrary dynamic geometry by utilizing only consumer level programmable graphics hardware. In this paper we introduce a new fully hardware accelerated penumbra map algorithm which stores additional penumbra informatio...
Intravenous recombinant tissue-type plasminogen activator (rt-PA) therapy is highly recommended to patients who are diagnosed with ischemic stroke within 4.5 hours after the onset while mechanical clot retrieval can be attempted in patients who are not indicated for or cannot effectively receive intravenous rt-PA therapy. In this article, we report early treatment outcomes and discuss the usefu...
BACKGROUND AND PURPOSE Intra-arterial (IA) rescue procedures are increasingly used to treat acute ischemic stroke. We implemented continuous transcranial Doppler (TCD) monitoring during these procedures to detect any potentially harmful flow changes. Here, we report diagnostic criteria and yield of TCD monitoring. METHODS We studied consecutive acute stroke patients who underwent IA reperfusi...
A simple extension to ray tracing is presented that creates visually plausible “soft” shadows with little extra computation. Although these soft shadows are approximate, they are robust and have penumbra widths that behave in a believable way, including accurate placement of singularities where penumbra width is zero. The method has continuous behavior in space and time, so it is appropriate fo...
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