نتایج جستجو برای: dir
تعداد نتایج: 11060 فیلتر نتایج به سال:
BACKGROUND AND PURPOSE Accurate detection and classification of purely intracortical lesions in multiple sclerosis (MS) are important in understanding their role in disease progression and impact on the clinical manifestations of the disease. However, detection of these lesions with conventional MR imaging remains a challenge. Although double inversion recovery (DIR) has been shown to improve t...
BACKGROUND Commonly used methods of assessing the accuracy of deformable image registration (DIR) rely on image segmentation or landmark selection. These methods are very labor intensive and thus limited to relatively small number of image pairs. The direct voxel-by-voxel comparison can be automated to examine fluctuations in DIR quality on a long series of image pairs. METHODS A voxel-by-vox...
We present the CIFFWEB system, an innovative tool for the verification of web sites, relying upon abductive logic programming. The system allows the user to define rules that a web site should fulfill by using (a fragment of) the query language Xcerpt. The rules are translated into abductive logic programs with constraints and their fulfillment is checked through the CIFF abductive proof proced...
Previous studies comparing phase sensitive inversion recovery (PSIR) to double inversion recovery (DIR) have demonstrated that use of PSIR improves cross-sectional in vivo detection of cortical lesions (CL) in multiple sclerosis. We studied the utility of PSIR in detection/characterization of accrual of CL over time in a 1-year longitudinal study in primary progressive multiple sclerosis (PPMS)...
This technical report presents the work which has been carried out using Distributed Information Retrieval methods for federated search of patent documents for the passage retrieval starting from claims (patentability or novelty search) task. Patent documents produced worldwide have manuallyassigned classification codes which in our work are used to cluster, distribute and index patents through...
This paper considers alternative directory protocols for providing cache coherence in shared-memory mul-tiprocessors with 32 to 128 processors, where the state requirements of Dir N may be considered tootate (also called superset), Coarse Vector, and three new protocols. The new protocols|Gray-hardware, Gray-software, Home|are optimizations of Tristate that use gray coding to favor near-neighbo...
BACKGROUND Optimizing scan parameters for double inversion recovery (DIR) sequences remains difficult. OBJECTIVE To evaluate a new method for optimizing DIR sequence scan parameters using T1 mapping and a newly developed analysis algorithm. METHODS Twelve healthy volunteers underwent T1 mapping and DIR magnetic resonance imaging. The following steps were used for image optimization includin...
Deformable image registration (DIR) is a type of registration that calculates a deformable vector field (DVF) between two image data sets and permits contour and dose propagation. However the calculation of a DVF is considered an ill-posed problem, as there is no exact solution to a deformation problem, therefore all DVFs calculated contain errors. As a result it is important to evaluate and as...
BACKGROUND Elevated serum uric acid experimentally stimulates renal vasoconstriction and activation of the renin- angiotensin system and consequently modulates erythropoietin (EPO) production. We used a dopamine-induced glomerular filtration response test (DIR) to assess whether elevated uric acid is associated with dopamine response and EPO levels in IgA patients. METHODS In 46 non-nephrotic...
Citation STAR Collaboration et al. " Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefi...
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