| Tao Li,Zhang Hui,Wu Yikai,et al.Monte Carlo simulation study of the effect of filter on radiotherapy dosimetry in superficial X-ray therapy apparatus[J].Chinese Journal of Radiological Medicine and Protection,2025,45(3):194-201 |
| Monte Carlo simulation study of the effect of filter on radiotherapy dosimetry in superficial X-ray therapy apparatus |
| Received:July 27, 2023 |
| DOI：10.3760/cma.j.cn112271-20240327-00109 |
| KeyWords:Superficial X-ray radiotherapy Filter Monte Carlo simulation Dosimetric optimization |
| FundProject:安徽省重点研究与开发计划(2023s07020020);国家自然科学基金项目(12275372);中国科学技术大学双一流医学物理与生物医学工程交叉学科平台(YD2140000601);2020年中科大新医学创新团队项目(YD2140002002) |
| Author Name | Affiliation | E-mail | | Tao Li | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Zhang Hui | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China
Department of Radiotherapy, First Affiliated Hospital of USTC, Hefei 230031, China | | | Wu Yikai | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Liu Junyi | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Qi Miao | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Gao Ning | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Chang Yankui | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Pei Xi | Anhui Wisdom Technology Co. Ltd, Hefei 230088, China | | | Chen Zhi | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | | | Xu Xie | School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230025, China | xgxu@ustc.edu.cn |
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| Abstract:: |
| Objective To explore the dosimetry optimization strategy based on filter thickness and shape selection for the bulb superficial X-ray radiotherapy unit. Methods Monte Carlo code TOPAS was used to model tubular equipment, and the dose distribution from six X-ray energies (50-150 kV) and five conventional aluminum filters (0.5-3.0 mm) with different thickness were simulated in the water model. The percentage depth dose (PDD) curve along the central axis, the center-axis profile dose at different depths, and the lateral dose distribution were analyzed. The dose distribution of three different designs of aluminum filters (conventional cylindrical, conical and oblique cylindrical filters) was compared to evaluate the effect of dosimetric optimization of different filter shapes. Results Under the same energy, increasing the thickness of the filter can optimize the superficial skin dose, and the optimization effect of depth dose uniformity can be increased by 26% at a depth of 5.5 mm at 70 kV energy. The raised, flat and inclined dose distribution modes can be achieved by using conventional cylindrical, conical and inclined aluminum filters. Conclusions By selecting the appropriate X-ray energy and filter thickness, an ideal dose distribution matching the tumor depth can be achieved. The application of personalized filters is also of great significance for diverse target areas. |
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