Monte Carlo study of transmission X-ray tubes in kilovoltage radiotherapy
10.3969/j.issn.1005-202X.2025.07.004
- VernacularTitle:透射式X射线管在kV级放射治疗的蒙特卡罗研究
- Author:
Yikai WU
1
;
Zhongyu QI
;
Li TAO
;
Hui ZHANG
;
Zeeshan MUHAMMAD
;
Zirui YE
;
Yankui CHANG
;
Xi PEI
;
Xu GEORGE
Author Information
1. 中国科学技术大学核科学技术学院,安徽 合肥 230025
- Publication Type:Journal Article
- Keywords:
transmission X-ray tube;
kilovoltage X-ray radiotherapy;
Monte Carlo;
intraoperative radiotherapy;
superficial X-ray radiotherapy;
dosimetry
- From:
Chinese Journal of Medical Physics
2025;42(7):863-871
- CountryChina
- Language:Chinese
-
Abstract:
Transmission X-ray tubes are relatively new devices characterized by portability,suitability for miniaturization,and low requirements for shielding,making them ideal radiation sources for kilovoltage X-ray therapy.However,their application in radiotherapy remains underexplored.An electron target model of a transmission X-ray tube is developed using the Monte Carlo toolkit TOPAS 3.8.1.The study investigates the effect of tungsten target thickness on X-ray output efficiency,finding that a tube voltage of 50 kV and a tungsten thickness of 1.4 μm yields the highest emission efficiency.Based on the energy spectrum at this optimal efficiency,polynomial fitting approach is applied to determine the corresponding aluminum filter thickness for mean energies ranging from 20 keV to 35 keV,achieving a mean fitting error of 0.91%.Next,the study simulates dose deposition in a water phantom for spectra with different mean energies and various source-to-surface distances,and plots percent-depth-dose curves,relative normalized dose-depth curves,and relative normalized dose histograms under each treatment condition.Finally,the simulated results are compared with experimental data from the intraoperative radiotherapy system Intrabeam and the superficial X-ray therapy unit SRT-100,obtaining average relative errors of 3.71%and 4.38%,respectively.These findings provide a theoretical foundation for further optimization of transmission X-ray tubes in kilovoltage radiotherapy.
