نتایج جستجو برای: penumbra system
تعداد نتایج: 2232435 فیلتر نتایج به سال:
We have measured velocity maps of a round sunspot near the center of the solar disk. We derive the small-scale velocity field of the penumbra in the deep photosphere. Superimposed on a radial outflow, we find up– and downflows, which are associated with bright and dark features: The flow in the dark component of the penumbra has a larger inclination angle with respect to the surface normal than...
Mueller, Frank. M.S., Purdue University, May, 2004. Penumbra: Enhancing Eclipse for Introductory Programming. Major Professor: Antony L. Hosking. In recent years, Java has become the most popular programming language for introductory programming courses; however, there has been a lack of a good Java development environment for novice computer science students. We decided to adapt Eclipse for te...
The management of acute “brain attack” is in evolution. A proliferation of new treatment approaches directed at lysing thrombus, normalizing cerebral perfusion, and reversing or minimizing neuronal ischemic damage are recently approved or currently under investigation. Preservation of “tissue at risk” within the ischemic penumbra is the goal of many of these newer therapies. The ischemic penumb...
AIMS The aim of this study was to assess the association between the proportions of penumbra-visualized by late gadolinium enhanced cardiovascular magnetic resonance imaging (LGE-CMR)-after acute myocardial infarction (AMI) and the prevalence of ventricular tachycardia (VT). METHODS One-hundred and sixty-two AMI patients, successfully, treated by primary percutaneous coronary intervention (PC...
BACKGROUND AND PURPOSE Penumbral biomarkers promise to individualize treatment windows in acute ischemic stroke. We used a novel magnetic resonance imaging approach that measures oxygen metabolic index (OMI), a parameter closely related to positron emission tomography-derived cerebral metabolic rate of oxygen utilization (CMRO2), to derive a pair of ischemic thresholds: (1) an irreversible-inju...
Background: Recently, multileaf collimators (MLC) have become an important part of any LINAC collimation system because they reduce the treatment planning time and improve the conformity. Important factors that affect MLCs collimation performance are leaves material composition and their thickness.Objective: In this study, we investigate main dosimetric parameters of a typical MLC includi...
AIMS To precisely characterize the penumbra by MRI based on a modified photothrombotic stroke mouse model. METHODS The proximal middle cerebral artery was occluded by a convenient laser system in conjunction with an intravenous injection of Rose Bengal in mice. And the suture MCAO model was performed in seven mice as a comparison of the reproducibility. One hour after occlusion, the penumbra ...
background: accurate small radiation field dosimetry is essential in modern radiotherapy techniques such as stereotactic radiosurgery (srs) and intensity modulated radiotherapy (imrt). precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. in the p...
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