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Abstract
Purpose:A computational system was developed for this paper in the C++ programming language, to create a 125 I radioactive seed entry file, based on the positioning of a virtual grid (template) in voxel geometries, with the purpose of performing prostat e cancer treatment simulations using the MCNPX code. Method:The system is fed with information from the plannin g system with regard to each seeds location and its depth, and an entry file is automatically created with all the cards (instruction s) for each seed regarding their cell blocks and surfaces spread out spatially in the 3D environment. The system provides with precision a reproduction of the clinical scenario for the MCNPX codes simulation environment, thereby allowing the techniques in -depth study.Results and Conclusion: The preliminary results from this study showed that the lateral pe -numbra of uniform scanning proton beams was less sensitive In order to validate the computational system, an entry file was created with 88 125I seeds that were inserted in the phantoms MAX06 prostate region with initial activity determined for the seeds at the 0.27 mCi value. Is dose curves were obtained in all the prostate slices in 5 mm steps in the 7 to 10 cm interval, totaling 7 slices. Variance reduction
Highlights
A system was developed and assessed during this exercise named IS – Seed Insertion – in the C++ programming language 3, which reproduces the experimental template (Figure 1) employed for the 125I seeds’ three-dimensional insertion during the prostate cancer treatment, in order to provide a tool allowing the automation and reproduction of the clinical scenario during low-dosage rate (LDR) brachytherapy procedures in a computational environment employing the Monte Carlo MCNPX code
According to estimates provided by Brazil’s National Cancer Institute (INCA/RJ/Brazil) on the incidence of cancer in Brazil for the year 2012, 60,180 new cases of prostate cancer are expected
The virtual template developed in the C++ programming language allows replicating any number of sources wished by the user, as well as to reproduce accurately the same spatial distributions performed in real planning
Summary
A system was developed and assessed during this exercise named IS – Seed Insertion – in the C++ programming language 3, which reproduces the experimental template (Figure 1) employed for the 125I seeds’ three-dimensional insertion during the prostate cancer treatment, in order to provide a tool allowing the automation and reproduction of the clinical scenario during low-dosage rate (LDR) brachytherapy procedures in a computational environment employing the Monte Carlo MCNPX code.
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