نتایج جستجو برای: volumetric modulated arc therapy

تعداد نتایج: 761818  

2014
Francisco J. Valverde-Albacete Carmen Peláez-Moreno

The most widely spread measure of performance, accuracy, suffers from a paradox: predictive models with a given level of accuracy may have greater predictive power than models with higher accuracy. Despite optimizing classification error rate, high accuracy models may fail to capture crucial information transfer in the classification task. We present evidence of this behavior by means of a comb...

2010
D. Baddeley V. O. Chagin L. Schermelleh S. Martin A. Pombo P. M. Carlton A. Gahl P. Domaing U. Birk H. Leonhardt C. Cremer M. C. Cardoso

DNA replication, similar to other cellular processes, occurs within dynamic macromolecular structures. Any comprehensive understanding ultimately requires quantitative data to establish and test models of genome duplication. We used two different super-resolution light microscopy techniques to directly measure and compare the size and numbers of replication foci in mammalian cells. This analysi...

Journal: :Physics in medicine and biology 2009
Grace Tang Matthew A Earl Cedric X Yu

Single-arc intensity-modulated arc therapy (IMAT) has gained worldwide interest in both research and clinical implementation due to its superior plan quality and delivery efficiency. Single-arc IMAT techniques such as the Varian RapidArc deliver conformal dose distributions to the target in one single gantry rotation, resulting in a delivery time in the order of 2 min. The segments in these tec...

2011
Derek Nowrouzezahrai Jared Johnson Andrew Selle Dylan Lacewell Michael Kaschalk Wojciech Jarosz

We present a method for generating art-directable volumetric effects, ranging from physically-accurate to non-physical results. Our system mimics the way experienced artists think about volumetric effects by using an intuitive lighting primitive, and decoupling the modeling and shading of this primitive. To accomplish this, we generalize the physically-based photon beams method to allow arbitra...

Journal: :Applied optics 2002
Antonio Virgillo Failla Udo Spoeri Benno Albrecht Alexander Kroll Christoph Cremer

A new approach to measuring the sizes of small fluorescent objects by use of spatially modulated illumination (SMI) far-field light microscopy is presented. This method is based on SME measurements combined with a new SMI virtual microscopy (VIM) data analysis calibration algorithm. Here, experimental SMI measurements of fluorescent objects with known diameter (size) were made. From the SMI dat...

2010
Carmem S. Pfeifer Hui Lu Junhao Ge Jeffrey W. Stansbury

The formation of glassy, high modulus polymer networks with conventional crosslinking monomers is accompanied by significant volumetric shrinkage that in turn, leads to the development of internal and external stresses. The analysis of conversion-dependent stress evolution, including real-time measurement several critical factors associated with stress development, will be detailed along with s...

Journal: :Physics in medicine and biology 2002
C Martens I Claeys C De Wagter W De Neve

In this paper the performance of radiographic film (KODAK X-Omat V) for analysing intensity-modulated (IM) beams in a plane at reference depth (5 cm for 6 MV, 10 cm for 18 MV) was investigated. The field size dependence of the film response was studied for small and medium field sizes. The dose rate dependence of the response and possible effects of fractionating the dose were assessed. In the ...

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