TY - JOUR ID - 13045 TI - The comparison between 6 MV Primus LINAC simulation output using EGSnrc and commissioning data JO - Iranian Journal of Medical Physics JA - IJMP LA - en SN - AU - Davoudi, Mohammad AU - Shabestani Monfared, Ali AU - Rahgoshay, Mohammad AD - Department of Medical Radiation Engineering, Central Tehran Branch, Islamic Azad University, Tehran AD - Professor of Medical Physics, Radiotherapy Physicist, Babolsar Oncology Hospital, Department of Medical Physics, Babol Univetsity of Medical Sciences, Babol, Iran. AD - Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran Y1 - 2018 PY - 2018 VL - 15 IS - Special Issue-12th. Iranian Congress of Medical Physics SP - 381 EP - 381 KW - BEAMnrc KW - Linac KW - Monte Carlo simulation KW - Radiotherapy KW - TPR DO - 10.22038/ijmp.2018.13045 N2 - 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) Monte Carlo model of the LINAC head was used as a benchmark. Materials and Methods In the first part, the BEAMnrc was used for the designing of the LINAC treatment head. In the second part, dose calculation and for the design of 3D dose file were produced by DOSXYZnrc. The simulated PDD and beam profile obtained were compared with that calculated using commissioning data. Good agreement was found between calculated PDD (1·1%) and beam profile using Monte Carlo simulation and commissioning data. After validation, TPR20,10, TMR and Sp values were calculated in five different field. Results Good agreement was found between calculated values by using Monte Carlo simulation and commissioning data. Average differences for five field sizes in this approach is about 0·83% for Sp. For TPR20,10 differences for field sizes 10 × 10 cm2 is 0·29% and for TMR in five field sizes, the average value is ~ 1·6%. Conclusion: In conclusion, the BEAMnrc and DOSXYZnrc codes package have very good accuracy in calculating dose distribution for 6 MV photon beam and it can be considered as a promising method for patient dose calculations and also the Monte Carlo model of primus linear accelerator built in this study can be used as method to calculate the dose distribution for cancer patients. UR - https://ijmp.mums.ac.ir/article_13045.html L1 - ER -