Electron Beam Measurements Employing Electron Montecarlo Algorithm on TrueBeam STx® and Clinac iX® Linear Accelerators

Kamal Saidi; Othmane Kaanouch; Hanae El Gouach; Mohamed Reda Mesradi; Mounir Mkimel; Redouane El Baydaoui

doi:10.3889/oamjms.2021.7564

Authors

Kamal Saidi Laboratory of Sciences and Health Technologies, Hassan First University of Settat, High Institute of Health Sciences, Settat, Morocco; Department of Radiotherapy, Sheikh Khalifa International University Hospital, Casablanca, Morocco https://orcid.org/0000-0002-8735-2943
Othmane Kaanouch Laboratory of Sciences and Health Technologies, Hassan First University of Settat, High Institute of Health Sciences, Settat, Morocco; Department of Radiotherapy, Sheikh Khalifa International University Hospital, Casablanca, Morocco
Hanae El Gouach Department of Radiotherapy, Sheikh Khalifa International University Hospital, Casablanca, Morocco; Laboratory of Mathematics, Computer Science and Engineering Sciences, Faculty of Science and Technology, Hassan First University, Settat, Morocco
Mohamed Reda Mesradi Laboratory of Sciences and Health Technologies, Hassan First University of Settat, High Institute of Health Sciences, Settat, Morocco
Mounir Mkimel Laboratory of Sciences and Health Technologies, Hassan First University of Settat, High Institute of Health Sciences, Settat, Morocco
Redouane El Baydaoui Laboratory of Sciences and Health Technologies, Hassan First University of Settat, High Institute of Health Sciences, Settat, Morocco

DOI:

https://doi.org/10.3889/oamjms.2021.7564

Keywords:

TrueBeam STx®, Clinac iX®, Eclipse, Electron Monte Carlo algorithm

Abstract

Electron beam measurement comparison between TrueBeam STx® and Clinac iX® established. Data evaluation of eMC-calculated and measured for TrueBeam STx® performed. Dosimetric parameters measured including depth dose curves for each applicator, percentage depth dose (PDDs) curves without applicator, the profile in-air for a large field size 40×40 cm², and the Absolute Dose (cGy/MU) for each applicator using a large water phantom (PTW, Freiburg, Germany), employing Roos and Markus plane-parallel ionization chambers. The data were examined for five electron beams of Varian’s TrueBeam STx® and Clinac iX® machines. A comparison between measurement PDDs and calculated by the Eclipse electron Monte Carlo (eMC) algorithm was performed to validate Truebeam STx® commissioning. The measured data indicated that electron beam PDDs from the TrueBeam STx® machine are well matched to those from Clinac iX® machine. The quality index R₅₀ for applicator 15×15 cm² was in the tolerance intervals. However, Surface dose (D_s) increases with increasing energy for both accelerators. Comparisons between the measured and eMC-calculated values revealed that the R₁₀₀, R₉₀, R₈₀, and R₅₀ values mostly agree within 5 mm. Measured and calculated bremsstrahlung tail R_p correlates well statistically. D_sagrees mostly within 2%. Electron beams were successfully validated for TrueBeam STx®, a good agreement between modeled and measured data was observed.

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