نتایج جستجو برای: tomography monte carlo plane integral reconstruction

تعداد نتایج: 589934  

2014
T. Gornak Oleg P. Iliev Peter Minev

Monte Carlo and Quasi-Monte Carlo Methods Optimized Particle Regeneration Scheme for the Wigner Monte Carlo Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Paul Ellinghaus, Mihail Nedjalkov, and Siegfried Selberherr Sensitivity Analysis of Design Parameters for Silicon Diodes . . . . . . . . . . . . 34 J.M. Sellier, Rayna Georgieva, and Ivan D...

Journal: :Optics express 2009
Yujie Lu Xiaoqun Zhang Ali Douraghy David Stout Jie Tian Tony F Chan Arion F Chatziioannou

Through restoration of the light source information in small animals in vivo, optical molecular imaging, such as fluorescence molecular tomography (FMT) and bioluminescence tomography (BLT), can depict biological and physiological changes observed using molecular probes. A priori information plays an indispensable role in tomographic reconstruction. As a type of a priori information, the sparsi...

Journal: :iranian journal of radiation research 0
a. mesbahi medical physics department, medical school, tabriz university of medical sciences- iran

background: monte carlo (mc) modeling of a linear accelerator is a prerequisite for monte carlo dose calculations in external beam radiotherapy. in this study, a simple and efficient model was developed for elekta sl-25 linear accelerator using mcnp4c monte carlo code materials and methods: the head of elekta sl-25 linac was simulated for 6 and 18 mv photon beams using mcnp4c mc code. energy sp...

Journal: :Physics Letters 2022

We provide optimized recursion relations for homodyne tomography. improve previous methods by mitigating the divergences intrinsic in calculation of pattern functions used previously, and detail how to implement data analysis through Monte Carlo simulations. Our refinements are necessary reconstruction excited quantum states which populate a high-dimensional subspace electromagnetic field Hilbe...

1994
Stefan Heinrich Alexander Keller

The radiance equation, which describes the global illumination problem in computer graphics, is a high dimensional integral equation. Estimates of the solution are usually computed on the basis of Monte Carlo methods. In this paper we propose and investigate quasi-Monte Carlo methods, which means that we replace (pseudo-) random samples by low discrepancy sequences, yielding deterministic algor...

Journal: :Physical review letters 2012
K P Driver B Militzer

We develop an all-electron path integral Monte Carlo method with free-particle nodes for warm dense matter and apply it to water and carbon plasmas. We thereby extend path integral Monte Carlo studies beyond hydrogen and helium to elements with core electrons. Path integral Monte Carlo results for pressures, internal energies, and pair-correlation functions compare well with density functional ...

2014
Frédéric Voisard Raynald Gauvin

In the last 10 years, the transmission electron tomography technique was extensively used in biology applications to obtain 3D configurations of small organic structures [1]. Such bright field electron tomography is not generally used in material science applications as the diffraction effects result in strong artefacts during the reconstruction. Bragg’s diffractions are indeed present at certa...

Journal: :iranian journal of medical physics 0
shahla ahmadi m.sc. in nuclear engineering, faculty of engineering, science and research branch, islamic azad university, tehran, iran hossein rajabi associate professor, medical physics dept., faculty of medicine, tarbiat modares university, tehran, iran farshid babapoor assistant professor, nuclear engineering dept., faculty of engineering, science and research branch, islamic azad university, tehran, iran faraz kalantari ph.d. student, medical physics dept., faculty of medicine, tarbiat modares university, research institute for nuclear medicine, tehran university of medical sciences,tehran, iran

introduction: the main goal of spect imaging is to determine activity distribution inside the organs of the body. however, due to photon attenuation, it is almost impossible to do a quantitative study. in this paper, we suggest a mathematical relationship between activity distribution and its corresponding projections using a transfer matrix. monte carlo simulation was used to find a precise tr...

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