A comparison of symmetry and flatness measurements in small electron fields by different dosimeters in electron beam radiotherapy.

Autor:	Bayatiani MR; Medical Physics and Radiotherapy Department, School of Paramedical Sciences, Arak University of Medical Sciences and Khansari Hospital, Arak, Iran., Fallahi F; Department of Medical Physics, School of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran., Aliasgharzadeh A; Department of Medical Physics, School of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran., Ghorbani M; Biomedical Engineering and Medical Physics Department, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran., Khajetash B; Medical Physics Department, School of Medicine, Iran University of Medical Sciences, Tehran, Iran., Seif F; Medical Physics and Radiotherapy Department, School of Paramedical Sciences, Arak University of Medical Sciences and Khansari Hospital, Arak, Iran.
Jazyk:	angličtina
Zdroj:	Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology [Rep Pract Oncol Radiother] 2021 Feb 25; Vol. 26 (1), pp. 50-58. Date of Electronic Publication: 2021 Feb 25 (Print Publication: 2021).
DOI:	10.5603/RPOR.a2021.0009
Abstrakt:	Background: Symmetry and flatness are two quantities which should be evaluated in the commissioning and quality control of an electron beam in electron beam radiotherapy. The aim of this study is to compare symmetry and flatness obtained using three different dosimeters for various small and large fields in electron beam radiotherapy with linac. Materials and Methods: Beam profile measurements were performed in a PTW water phantom for 10, 15 and 18 MeV electron beams of an Elekta Precise linac for small and large beams (1.5 × 1.5 cm 2 to 20 × 20 cm 2 field sizes). A Diode E detector and Semiflex-3D and Advanced Markus ionization chambers were used for dosimetry. Results: Based on the obtained results, there are minor differences between the responses from different dosimeters (Diode E detector and Semiflex-3D and Advanced Markus ionization chambers) in measurement of symmetry and flatness for the electron beams. The symmetry and flatness values increase with increasing field size and electron beam energy for small and large field sizes, while the increases are minor in some cases. Conclusions: The results indicate that the differences between the symmetry and flatness values obtained from the three dosimeter types are not practically important. Competing Interests: Conflict of interest There is not any relationship that might lead to a conflict of interest. (© 2021 Greater Poland Cancer Centre.)
Databáze:	MEDLINE
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