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. 2018 Mar 1;8(1):29-42.
eCollection 2018 Mar.

Evaluation of the Effect of Source Geometry on the Output of Miniature X-ray Tube for Electronic Brachytherapy through Simulation

B Barati  1 , M Zabihzadeh  1 , M J Tahmasebi Birgani  1   2 , N Chegini  1 , J Fatahiasl  1 , I Mirr  3
Affiliations

Evaluation of the Effect of Source Geometry on the Output of Miniature X-ray Tube for Electronic Brachytherapy through Simulation

B Barati et al. J Biomed Phys Eng. .

Abstract

Objective: The use of miniature X-ray source in electronic brachytherapy is on the rise so there is an urgent need to acquire more knowledge on X-ray spectrum production and distribution by a dose. The aim of this research was to investigate the influence of target thickness and geometry at the source of miniature X-ray tube on tube output.

Method: Five sources were simulated based on problems each with a specific geometric structure and conditions using MCNPX code. Tallies proportional to the output were used to calculate the results for the influence of source geometry on output.

Results: The results of this work include the size of the optimal thickness of 5 miniature sources, energy spectrum of the sources per 50 kev and also the axial and transverse dose of simulated sources were calculated based on these thicknesses. The miniature source geometric was affected on the output x-ray tube.

Conclusion: The result of this study demonstrates that hemispherical-conical, hemispherical and truncated-conical miniature sources were determined as the most suitable tools.

Keywords: Electronic Brachytherapy; Energy Spectrum; Miniature Source; Target Optimization; Monte Carlo.

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Figures

Figure1
Figure1
A view of miniature X-ray sources simulated for conducting the study
Figure2
Figure2
A view of the targets that had a size range of optimum thickness of sources
Figure3
Figure3
A view of the form used to determine the optimum thickness by measuring the dose
Figure4
Figure4
Diagrams obtained based on electron penetration , that show optimized thickness for the sources (first method)
Figure4
Figure4
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Figure4
Figure5
Figure5
Diagrams of relative dose of the results of section of dose calculations to determine the optimum thickness and to validate the first
Figure5
Figure5
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Figure6
Figure6
the diagram of the relationship between electron range with the release of energy within the target until it is stopped so that, the optimum thickness is less than the electron ranges and sources with larger optimum thickness, the electron range within them is far greater than the other sources
Figure7
Figure7
Shows spectra of 5 miniature X-ray source and suggests that the intensity of the planer source was higher than the rest and that the spectrum intensity declined sharply according to the increased distance from the source
Figure7
Figure7
Figure7
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Figure8
Figure8
Comparison of axial and transverse dose distribution of a miniature X-ray source
Figure8
Figure8
See this image and copyright information in PMC

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