Verification of Dose Calculation Accuracy of Rtp Systems by Monte Carlo Simulation
نویسندگان
چکیده
High dose rate brachytherapy has attained the good local control for cervix cancer because radioactive source can be put close to tumors, resulting in increasing the dose delivery per one fraction. However, quality assurance must be accompanied to reduce severe complication. We verified the dose distribution around the source by comparing measured dose with calculated dose by Radiation Therapy Planning systems (RTPS) as well as Monte Carlo simulation. We found as much as 10-30 % differences around Ir-192 source between measured dose with TLD (BeO)/grass dosimeters and calculated dose. The differences of the calculation algorithm of dose distribution affect about 10% between PLATO and Buchler facts. The source structure considerably affects the dose distribution especially in the forward direction. These data suggest that the appropriate parameters such as anisotropy function, radial dose function etc must be verified by their calculation algorism and source structures in the clinical practice of quality assurance.
منابع مشابه
Dose Calculations for Lung Inhomogeneity in High-Energy Photon Beams and Small Beamlets: A Comparison between XiO and TiGRT Treatment Planning Systems and MCNPX Monte Carlo Code
Introduction Radiotherapy with small fields is used widely in newly developed techniques. Additionally, dose calculation accuracy of treatment planning systems in small fields plays a crucial role in treatment outcome. In the present study, dose calculation accuracy of two commercial treatment planning systems was evaluated against Monte Carlo method. Materials and Methods Siemens Once or linea...
متن کاملThe comparison between 6 MV Primus LINAC simulation output using EGSnrc and commissioning data
Introduction: Monte Carlo calculation method is considered to be the most accurate method for dose calculation in radiotherapy. The purpose of this research is comparison between 6 MV Primus LINAC simulation output with commissioning data using EGSnrc and build a Monte Carlo geometry of 6 MV Primus LINAC as realistically as possible. The BEAMnrc and DOSXYZnrc (EGSnrc package) M...
متن کاملEvaluation of the RtDosePlan Treatment Planning System using Radiochromic Film and Monte Carlo Simulation
Introduction: GafChromic EBT films are one of the self-developing and modern films commercially available for dosimetric verification of treatment planning systems (TPSs). Their high spatial resolution, low energy dependence and near-tissue equivalence make them suitable for verification of dose distributions in radiation therapy. This study was designed to evaluate the dosimetric parameters of...
متن کاملAn Approach in Radiation Therapy Treatment Planning: A Fast, GPU-Based Monte Carlo Method
Introduction: An accurate and fast radiation dose calculation is essential for successful radiation radiotherapy. The aim of this study was to implement a new graphic processing unit (GPU) based radiation therapy treatment planning for accurate and fast dose calculation in radiotherapy centers. Materials and Methods: A program was written for parallel runnin...
متن کاملA method for range calculation of proton in liquid water: Validation study using Monte Carlo method and NIST data
Introduction: The main advantage of using ion beams over photons in radiotherapy is due to their inverse depth-dose profiles, allowing higher doses to tumors, while better sparing normal tissues. When calculating dose distributions with ion beams, one crucial point is the uncertainty of the Bragg-peak range. Recently great effort is devoted to enhance the accuracy of the comput...
متن کامل