نتایج جستجو برای: hounsfield number
تعداد نتایج: 1169456 فیلتر نتایج به سال:
abstract: in this thesis, we focus to class of convex optimization problem whose objective function is given as a linear function and a convex function of a linear transformation of the decision variables and whose feasible region is a polytope. we show that there exists an optimal solution to this class of problems on a face of the constraint polytope of feasible region. based on this, we dev...
Introduction: In radiotherapy treatment planning system (TPS), basic input is the data from computed tomography (CT) scan, which takes into account the effect of inhomogeneities in dose calculations. Measurement of CT numbers may be affected by scanner-specific parameters. Therefore, it is important to verify the effect of different CT scanning protocols on Hounsfield unit (HU) and its impact o...
L. Scarpelli, F. Masia, E.M. Alexeev, F. Withers, A.I. Tartakovskii, K.S. Novoselov, and W. Langbein School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, United Kingdom Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, United Kingdom College of Engineering, Mathematics and Physical Sciences, University of Exeter, North P...
Abbreviations: computed tomographic, CT; Hounsfield unit, HU; lowest 15th percentile of the density values, PD15; Danish Lung Cancer Screening Trial, DLCST; Evaluation of COPD Longitudinally to Identify Predictive Surrogate Endpoints, ECLIPSE; forced expiratory volume in 1 second, FEV1; alpha-1 antitrypsin deficiency, AATD Citation: Come CE, Washko GR. Editorial: CT scanning in COPD—Is it time ...
We present an approach for adapted transfer function (TF) specification to highlight pathologic changes of the coronary artery vessel wall based on contrast medium-enhanced computed tomography (CT) datasets. The TFs are combined with common visualization techniques for the evaluation of coronary arteries in CT image data. The presented mapping of CT values in Hounsfield Units (HU) to optical pr...
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