πŸ– Aplicaciones de Monte Carlo en Simulaciones de Rayos X – JOHAMSC

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We estimate bone dose considering: a bone material water, calcium and bone tissue ; b bone thickness 0. It would employ a modular. Simulation of X-ray irradiation on human hand. The first one exploits the VXI ray-tracing approach to compute the object transmission function. A deterministic algorithm simulating phase contrast PC x-ray images for complex 3- dimensional 3D objects is presented. The various input parameters are illustrated and the result of a simulation procedure is presented for a particular discharge in W VII-A. However, minor differences between the simulated spectra and the 'standard' ones are observed. Work supported by U. Talbot Carpet Simulation for X-ray grating interferometer. The models can be used in other feeding devices as well. Besides an uniform rotation of the asymmetric terms some specific simple time evolution of the signals can be included non-uniform rotation, growth of oscillations, sawtooth oscillations. In addition radial profiles of the line integrated emmission averaged over some time interval or at specific times, the relative amplitude modulation and the relative phase of the oscillations are calculated. The results supplied by the presented algorithm are examined with the help of some relevant examples. In the first part, the use of computer-aided drawing CAD models enables simulations to be carried out with complex 3D objects. The plasma density and temperature radial profiles needed in the soft x-ray signal modeling are obtained from experimental data, i. Simulation of transmitted X-rays in a polycapillary X-ray lens. The virtual diagnostics based on an ideal linear instability also agree reasonably well with the experimental data. The agreements also motivate further detailed simulations with improved physical models such as the nonideal magnetohydrodynamics contributions resistivity, viscosity, nonaxisymmetric error fields, etc. E-mail: benngkp at netvigator. Talbot carpet has been studied as the beam behavior which is distinguished with common X-ray imaging systems. The iterative calculation of the intensities is based on the Taylor series general term, and the primary beam power expansion is given as function of the beam x penetration in the crystal surface. The virtual soft x-ray diagnostics for the equilibriums have a good agreement with the experimental data. The second part simulates the PC image due to the wave front distortion introduced by the sample. Both bremsstrahlung and characteristic x-ray production were included in the model. In the plasma-shell regime, x-ray power has been more than tripled over that generated in the wire-plasma regime. Objective: To simulate the radiation leakage of the X-ray security inspection equipment used in the subways stations. A model for generating x-ray spectra in mammography is presented. The results of studies of the sensitivity of x-ray output to charging voltage and current, and to initial gas density will be presented. The results produced by the analytical model are at least as reliable as those obtained by Monte-Carlo simulations , even without considering the very challenging contribution of multiple scattering. Modeling x-ray data for the Saturn z-pinch machine. There is good agreement between the simulated x-ray spectra and the comparison spectra as the test yielded a probability value of nearly 1. The program uses the X-ray multiple diffraction theory for imperfect crystals. A wealth of XRD and time dependent x-ray imaging data exist for the Saturn z-pinch machine, where the load is either a tungsten wire array or a tungsten wire array which implodes onto a SiO 2 foam. As a first step we produce a spatial high resolution image by using a point and monochromatic source and an ideal detector. Numerical calculation of the line integrals for the different viewing angles and for a set of rotation angles covering one full signal period provides simulated periodic signals. It is helpful to understand grating interferometer and possible to expect beams' oscillation for designing theoretically. Then, in order to account for the system spatial resolution properties, the high spatial resolution image mono or polychromatic is convolved with the total point spread function of the imaging system under consideration. We calculate photon transmission percent through soft tissue and bone tissue and the statistics from the number of photons that reach the radiographic film after passing through soft tissue or bone tissue for our geometric configuration.{/INSERTKEYS}{/PARAGRAPH} X-ray scattering in X-ray fluorescence spectra with X-ray tube excitation - Modelling, experiment, and Monte-Carlo simulation. X-ray scattering may contribute significantly to the spectral background of X-ray fluorescence XRF spectra. The simulated x-ray emission spectra were compared with two sets of spectra, those of Boone et al Med. Grating interferometer produces interference of X-ray called Talbot pattern with gratings manufactured in micro scale. A systematic experimental study of annular aluminum wire z-pinches on the Saturn accelerator at Sandia National Laboratories shows that, for the first time, many of the measured spatial characteristics and x-ray powers can be correlated to 1D and 2D, radiation-magneto-hydrodynamic code RMHC simulations when large numbers of wires are used. Soft x-ray virtual diagnostics for tokamak simulations. Simulations of various inner electrode configurations will also be presented. Based on metrological measurements carried out with a scanning electron microscope SEM having attached a well characterised X-ray source polychromatic X-ray tube and a calibrated energy dispersive X-ray spectrometer EDS the accuracy of a physical model for X-ray scattering is systematically evaluated for representative samples. We calculate bone doses by considering a soft tissue - water - and calcium bone hand, which is irradiated with a million of X-rays photons from a punctual source. Simulation of a dense plasma focus x-ray source. We have simulated X-ray interference for a variety of simulations and demonstrated a few examples in this summary. Hammer, et al. Result: the biggest amount of radiation received by the body is 8. Multiple x-ray diffraction simulation and applications. Through these comparisons, areas of good and lesser quality agreement are determined, and areas are identified where the 2-D Eulerian code should be improved. The final. New developments in simulating X-ray phase contrast imaging. Talbot pattern is self-images of phase grating which develops interference as beam splitter that is one of gratings consisted of interferometer. Relevant applications of the implementation of the analytical model presented in this paper are the prediction of the limits of detection for particular cases or the determination of the transmission of X-ray polycapillary lenses. Monte Carlo simulation of x-ray spectra in mammography. This calculated gap coincides with the measured transition of 1. Design modifications are discussed for an electron beam accelerator used as a Bremsstrahlung x-ray source. Advances in X-Ray Simulator Technology. These photons are directed inside a conic angle on the hand. To simulate the polychromatic case, the intensity image is integrated over the considered x-ray energy spectrum. {PARAGRAPH}{INSERTKEYS}X-ray simulation development. Ng, K. The simulated diagrams are calculated point-to-point and the tests for the Si and GaAs presented good reproduction of the experimental diagrams for different primary reflections. Calculations show that the implosion begins to transition from that of individual wire plasmas to that of a continuous plasma shell when the circumferential gap between wires in the array is reduced below 1. Therefore, continuous X-ray can be used to research some cable responses of pulsed X-ray irradiation under the mechanism described in the one-dimension model. The virtual or synthetic soft x-ray signals for a sample DIII-D discharge are compared with the experimental data. Plasmas 3, Peterson, et al. Initial operating characteristics and performance improvements are presented. Special attention has been paid to Compton broadening. In this study, Talbot carpet simulator has been developed to visualize the X-ray grating interference patterns in grating interferometer. The simulation results for two half-lenses are in good agreement with the experimental results. DOE Contract No. Simulation of X-ray signals. Sanford, T. These have to be fitted to the corresponding measured signals and profiles in order to get a reliable picture of the local emissivity. The geometrical description of capillary systems adjusted for the controlled guiding of X-rays and the basic theory of the transmission of X-rays are presented. The above models permit to account more correctly the tube performance peculiarities, to obtain the maximum efficiency and to prolong the service life. Feasibility of using continuous X-ray to simulate cable response under X-ray environment. Digital models for the overload and overheat protection of X-ray diagnostic are considered. Background subtraction relying on purely mathematical procedures is state-of-the-art. The agreements are good enough to justify the methodology presented here for utilizing virtual diagnostics for routine comparison of experimental data. Then using response functions, these spectra are converted to XRD currents and camera images, which are quantitatively compared with the data. Simulation in X-ray equipment manufacture. This development allows to consider the simultaneous interaction of the beams involved in the multiple diffraction phenomenon. A one-dimension model of strip line irradiation response of X-ray was given, which includes the gap between cable shield and dielectric, and induced conductivity in cable dielectric. The knowledge of the X-ray spectrometer efficiency, but also of the spectrometer response functions makes it possible to define a physical spectral background of XRF spectra. As the other gratings, there are source grating makes coherence and analyze grating is used to analyze interference onto detector. The mechanism and simulating method of cable response induced by X-ray were researched, and the relationship of cable response irradiated by continuous and pulsed X-ray was analyzed. The algorithm consists mainly of two parts. The calculation result using the model indicates that the cable responses of continuous and rectangular-pulsed X-ray have the similar current waveform and the same gap voltages. The physical model chosen to account for PC technique is based on the Fresnel-Kirchhoff diffraction theory. Each asymmetry can be generated in two ways modulation of intensity and of geometry parameters. These studies should indicate ways to optimize x-ray production efficiency. Using the Monte Carlo code MCNP we simulate a human hand X-rays irradiation with radiodiagnostic energies to find the better range energy to make radiographs with the lowest dose and an optimal contrast. A method of numerical calculation, based on Ray-Tracing theory, is developed to simulate the transmission efficiency of an X-ray parallel lens and the shape and size of the light spot gain from it.