Fast patient-specific Monte Carlo brachytherapy dose calculations via the correlated sampling variance reduction technique
نویسندگان
چکیده
منابع مشابه
Accelerated Monte Carlo based dose calculations for brachytherapy planning using correlated sampling.
Current brachytherapy dose calculations ignore applicator attenuation and tissue heterogeneities, assuming isolated sources embedded in unbounded medium. Conventional Monte Carlo (MC) dose calculations, while accurate, are too slow for practical treatment planning. This study evaluates the efficacy of correlated sampling in reducing the variance of MC photon transport simulation in typical brac...
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Background: The Monte Carlo (MC) method is not only used for dose calculations around brachytherapy sources but also for benchmarking treatment planning systems (TPS) calculations. Materials and Methods: Three 60Co sources of GZP6 brachytherapy unit were simulated using MCNP4C MC Code. The radial dose functions were calculated by MC method and GZP6 TPS and were compared. Results: There was a go...
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A number of accelerated Monte Carlo (MC) codes have been developed in recent years for brachytherapy applications, one of which is PTRAN_CT. Developed as an extension to the well-benchmarked PTRAN code, PTRAN_CT can be used to perform efficient patientspecific dose calculations. The code can explicitly account for the patient geometry converted from computed-tomography (CT) images, as well as p...
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Variance reduction has always been a central issue in Monte Carlo experiments. Population Monte Carlo can be used to this effect, in that a mixture of importance functions, called a D-kernel, can be iteratively optimised to achieve the minimum asymptotic variance for a function of interest among all possible mixtures. The implementation of this iterative scheme is illustrated for the computatio...
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2012
ISSN: 0094-2405
DOI: 10.1118/1.3679018