نتایج جستجو برای: atlas
تعداد نتایج: 24983 فیلتر نتایج به سال:
This report describes a new electronic atlas of human cerebral cortex that provides a substrate for a wide variety of brain-mapping analyses. The Population-Average, Landmark- and Surface-based (PALS) atlas approach involves surface-based and volume-based representations of cortical shape, each available as population averages and as individual subject data. The specific PALS-B12 atlas introduc...
PURPOSE Variations in target volume delineation represent a significant hurdle in clinical trials involving conformal radiotherapy. We sought to determine the effect of a consensus guideline-based visual atlas on contouring the target volumes. METHODS AND MATERIALS A representative case was contoured (Scan 1) by 14 physician observers and a reference expert with and without target volume deli...
STUDY DESIGN This is a cross-sectional analysis of resonance magnetic images of 111 patients with craniocervical malformations and those of normal subjects. OBJECTIVE To test the hypothesis that atlas assimilation is associated with basilar invagination (BI) and atlas's anterior arch assimilation is associated with craniocervical instability and type I BI. SUMMARY OF BACKGROUND DATA Atlas a...
OBJECT Chiari malformation Type I (CM-I) is generally regarded as a disorder of the paraxial mesoderm. The authors report an association between CM-I and hereditary disorders of connective tissue (HDCT) that can present with lower brainstem symptoms attributable to occipitoatlantoaxial hypermobility and cranial settling. METHODS The prevalence of HDCT was determined in a prospectively accrued...
یکی از روش های مطالعه قطعات نیمرسانا استفاده از نرم افزارهای شبیه سازی است. در تحقیق حاضر ابتدا مهمترین نرم افزارهای شبیه سازی قطعات نیمرسانا مانند atlas, spice و pcid معرفی و مورد ارزیابی قرار گرفته است و سپس از چند برنامه موجود برای بررسی پارامترهای یک سلول فوتوولتایی (خورشیدی) استفاده شده است .- از مهمترین نرم افزارهای شبیه سازی می توان به برنامه pcid,atlas,spice اشاره نمود . - ب...
Introduction: Nowadays, magnetic resonance imaging (MRI) in combination with computed-tomography (CT) is increasingly being used in radiation therapy planning. MR and CT images are applied to determine the target volume and calculate dose distribution, respectively. Since the use of these two imaging modalities causes registration uncertainty and increases department w...
We introduce a generative probabilistic model for segmentation of tumors in multi-dimensional images. The model allows for different tumor boundaries in each channel, reflecting difference in tumor appearance across modalities. We augment a probabilistic atlas of healthy tissue priors with a latent atlas of the lesion and derive the estimation algorithm to extract tumor boundaries and the laten...
We investigate the performance benefits of a novel recursive formulation of Strassen’s algorithm over highly tuned matrix-multiply (MM) routines, such as the widely used ATLAS for high-performance systems. We combine Strassen’s recursion with high-tuned version of ATLAS MM and we present a family of recursive algorithms achieving up to 15% speed-up over ATLAS alone. We show experimental results...
Partial or complete absence of the posterior arch of the atlas is a well-documented anomaly but a relatively rare condition. This condition is usually asymptomatic so most are diagnosed incidentally. There have been a few documented cases of congenital defects of the posterior arch of the atlas combined with atlantoaxial subluxation. We report a very rare case of congenital anomaly of the atlas...
An overview of minimum bias and underlying event studies at the LHC with the ATLAS and CMS detectors is presented. Current uncertainties in the modeling of soft pp inelastic interactions at the LHC energy scale are discussed. Triggers used to select inelastic interactions at ATLAS and CMS are described and compared. A summary of some of the ongoing minimum bias and underlying event analyses by ...
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