Optimisation of 12 MeV electron beam simulation using variance reduction technique

10th International Seminar on Medical Physics; 1st AMDI International Oncology Symposium

物理学;医药卫生

Jayamani, J.^1 ; Termizi, N. A. S. Mohd^2 ; Kamarulzaman, F N Mohd^2 ; Aziz, M. Z. Abdul^1

Oncological and Radiological Science Cluster, Advance Medical and Dental Institute, Universiti Sains Malaysia, Kepala Batas, Penang

13200, Malaysia^1

School of Physics, Universiti Sains Malaysia, USM Penang

11800, Malaysia^2

关键词: Computation time;    Electron beam radiotherapy;    History analysis;    MC simulation;    MeV-Electrons;    Model simulation;    Optimisations;    Variance reduction techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012031/pdf
DOI  :  10.1088/1742-6596/851/1/012031

学科分类：卫生学

来源: IOP

【 摘 要 】

Monte Carlo (MC) simulation for electron beam radiotherapy consumes a long computation time. An algorithm called variance reduction technique (VRT) in MC was implemented to speed up this duration. This work focused on optimisation of VRT parameter which refers to electron range rejection and particle history. EGSnrc MC source code was used to simulate (BEAMnrc code) and validate (DOSXYZnrc code) the Siemens Primus linear accelerator model with the non-VRT parameter. The validated MC model simulation was repeated by applying VRT parameter (electron range rejection) that controlled by global electron cut-off energy 1,2 and 5 MeV using 20 x 107particle history. 5 MeV range rejection generated the fastest MC simulation with 50% reduction in computation time compared to non-VRT simulation. Thus, 5 MeV electron range rejection utilized in particle history analysis ranged from 7.5 x 107to 20 x 107. In this study, 5 MeV electron cut-off with 10 x 107particle history, the simulation was four times faster than non-VRT calculation with 1% deviation. Proper understanding and use of VRT can significantly reduce MC electron beam calculation duration at the same time preserving its accuracy.