Determination of initial electron parameters by means of Monte Carlo simulations for the Siemens Artiste Linac 6 MV photon beam

Abstract

In this study, we investigated initial electron parameters of Siemens Artiste Linac with 6 MV photon beam using the Monte Carlo method.Background: It is essential to define all the characteristics of initial electrons hitting the target, i.e. mean energy and full width of half maximum (FWHM) of the spatial distribution intensity, which is needed to run Monte Carlo simulations. The Monte Carlo is the most accurate method for simulation of radiotherapy treatments.Materials and methods: Linac head geometry was modeled using the BEAMnrc code. The phase space files were used as input file to DOSXYZnrc simulation to determine the dose distribution in a water phantom. We obtained percent depth dose curves and the lateral dose profile. All the results were obtained at 100 cm of SSD and for a 10 × 10 cm 2 field.Results: We concluded that there existed a good conformity between Monte Carlo simulation and measurement data when we used electron mean energy of 6.3 MeV and 0.30 cm FWHM value as initial parameters. We observed that FWHM values had very little effect on PDD and we found that the electron mean energy and FWHM values affected the lateral dose profile.However, these effects are between tolerance values. Conclusions:The initial parameters especially depend on components of a linac head. The phase space file which was obtained from Monte Carlo Simulation for a linac can be used as calculation of scattering, MLC leakage, to compare dose distribution on patients and in various studies.

Monte Carlo evaluation of particle interactions within the patient-dependent part of Elekta 6 MV photon beam applying IAEA phase space data

“…To adequately validate the photon beam’s quality taken by the simulation GATE against the accurate measured data and according to international recommendations (IAEA TRS398) [ 15 , 16 ], the index of quality tissue phantom ratio (TPR) in water for the square field 10 × 10 cm 2 the D 10 (%) , d max (cm) and d 80 (cm) are reported and compared as shown in Table 2 .…”

Effect of different target materials of LINAC head on photon spectrum

“…The Percent Depth Dose (PDD) curves were computed along the central axis. The electron cutoff energy (ECUT) and the photon cutoff energy (PCUT) parameters for the BEAMnrc and DOSXYZnrc were set as 0.7 MeV and 0.01 MeV, respectively (Tuğrul & Eroğul, 2019, 2020. The mean photon energy distribution of X-rays, which were formed as a result of the electron with 6 MeV hitting the target, were obtained by using the 'phase space file' on the BEAMDP (Ma & Rogers, 2020).…”

The Study of Dosimetric Characteristics of the XHA600D Medical Linear Accelerator Based on a Monte Carlo Code

“…ese steps are ultimately designed to obtain the signi cant parameters in TPS model building. Many investigations have been conducted to benchmark the incident electrons of other medical linear accelerators such as Elekta [3][4][5], Varian [6][7][8][9], and Siemens [10,11], but no dosimetric studies on the XHA600D accelerator have yet been found. And unlike these references, this study speci cally analyzed the e ects of these four incident electron parameters on PDDs and OARs in di erent beam elds and the details of the benchmarking process to obtain accurate incident electron information of the XHA600D accelerator.…”