نتایج جستجو برای: gamma index
تعداد نتایج: 515104 فیلتر نتایج به سال:
The feasibility of estimating patient-specific dose verification results directly from linear accelerator (linac) log files has been investigated for prostate cancer patients who undergo volumetric modulated arc therapy (VMAT). Twenty-six patients who underwent VMAT in our facility were consecutively selected. VMAT plans were created using Monaco treatment planning system and were transferred t...
We construct cosmological models based on a complex scalar field with power-law potential $V=\frac{K}{\ensuremath{\gamma}\ensuremath{-}1}(\frac{m}{\ensuremath{\hbar}}{)}^{2\ensuremath{\gamma}}|\ensuremath{\varphi}{|}^{2\ensuremath{\gamma}}$ associated polytropic equation of state $P=K{\ensuremath{\rho}}^{\ensuremath{\gamma}}$ (the an isothermal $P=\ensuremath{\rho}{k}_{B}T/m$ is $V=\frac{m{k}_{...
PURPOSE To investigate the sensitivity of traditional gamma-index-based analysis using diode arrays to detect significant dosimetric errors in patientspecific measurements for VMAT brain SRT plans. METHODS Quality assurance measurements were performed using an ion chamber and two different diode array devices for four brain SRT treatment plans. All cases were planned with Eclipse AAA RapidArc...
The recently observed X-ray synchrotron emission from four supernova remnants (SNR) has strengthened the evidence that cosmic ray electrons are accelerated in SNR. We show, that if this is indeed the case, the local electron spectrum will be strongly time-dependent, at least above roughly 30 GeV. The time dependence stems from the Poisson fluctuations in the number of SNR within a certain volum...
We present a determination of the distributions of the photon spectral index and gamma-ray flux—the so-called log N–log S relation—for the 352 blazars detected with a greater than approximately 7σ detection threshold and located above ±20◦ Galactic latitude by the Large Area Telescope of the Fermi Gamma-ray Space Telescope in its first year catalog. Because the flux detection threshold depends ...
Radio protective effects of metformin and its ability to alter the spontaneous induced genotoxic cytotoxic levels on human peripheral blood lymphocytes were investigated in this study. Metformin, a hypoglycemic oral drug, is biguanide derived from Galega officinalis that widely utilized controlling type 2 diabetes mellitus. Whole samples 10 healthy donors (5 males 5 females) exposed two doses g...
We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extragalactic" diffuse gamma-ray emission (EGB). This component of the diffuse gamma-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modeling of the brig...
The unidentified TeV gamma-ray source MGRO J1908+06/HESS J1908+063 was observed with the VERITAS Imaging Atmospheric Cherenkov Array during October 2007 and May-June 2008. This extended source is located on the galactic plane at a galactic longitude of 40.45 degrees and has a hard TeV spectrum with an index of Γ≈2.08 [1]. The Very High Energy (VHE) gamma-ray flux was measured by H.E.S.S. out to...
Volumetric-modulated arc therapy (VMAT) plans may require more control points (or segments) than some of fixed-beam IMRT plans that are created with a limited number of segments. Increasing number of control points in a VMAT plan for a given prescription dose could create a large portion of the total number of segments with small number monitor units (MUs) per segment. The purpose of this study...
We build stochastic models for analyzing Jaya and semi-steady-state algorithms. The analysis shows that (a) the maximum expected value of number worst-index updates per generation is a paltry 1.7 regardless population size; (b) size, expectation best-index decreases monotonically with generations; (c) exact upper bounds as well asymptotics best-update counts can be obtained specific distributio...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید