Title :
A Geant4-based simulation of an accelerator´s head used for intensity modulated radiation therapy
Author :
Foppiano, F. ; Mascialino, B. ; Pia, M.G. ; Piergentili, M.
Author_Institution :
Ist. Nazionale per la Ricerca sul Cancro, Genova, Italy
Abstract :
We present a Geant4-based simulation, this Monte Carlo program has been developed in order to simulate the absorbed dose distribution given by a medical linac used for intensity modulated radiation therapy (IMRT). The linac geometry was input into the Monte Carlo code using the accelerator´s manufacturer´s specifications. We made assumptions about some parameters such as the energy and the electron radial distributions that were assumed to be Gaussian in shape. The capability of the program in evaluating dose distribution has been verified by comparison with measurements in water phantom; the comparisons were performed for percent depth dose (PDD) and for flatness at 15, 50 and 100 mm depth for various field size, for a 6 MV electron beam. The source-surface distance (SSD) was 100 cm. We show the comparisons between simulation results and experimental measurements and the software architecture.
Keywords :
Monte Carlo methods; dosimetry; geometry; linear accelerators; medical computing; physics computing; radiation therapy; Geant4-based simulation; IMRT; Monte Carlo program; absorbed dose distribution; accelerator head; electron beam; electron radial distributions; flatness; intensity modulated radiation therapy; linac geometry; medical linac; percent depth dose; source-surface distance; water phantom; Acceleration; Biomedical applications of radiation; Geometry; Head; Intensity modulation; Linear particle accelerator; Manufacturing; Medical simulation; Modulation coding; Monte Carlo methods;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Print_ISBN :
0-7803-8700-7
DOI :
10.1109/NSSMIC.2004.1462683