Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system
For proton pencil beam scanning (PBS) technology, the accuracy of the dose distribution in a patient is sensitive to the properties of the incident beam. However, mechanical deformation of the proton therapy facility may occur, and this could be an important factor affecting the proton dose distribu...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-09-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573319306588 |
| _version_ | 1818296562254610432 |
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| author | Ming Wang Jinxing Zheng Yuntao Song Ming Li Xianhu Zeng |
| author_facet | Ming Wang Jinxing Zheng Yuntao Song Ming Li Xianhu Zeng |
| author_sort | Ming Wang |
| collection | DOAJ |
| description | For proton pencil beam scanning (PBS) technology, the accuracy of the dose distribution in a patient is sensitive to the properties of the incident beam. However, mechanical deformation of the proton therapy facility may occur, and this could be an important factor affecting the proton dose distribution in patients. In this paper, we investigated the effect of deformation on an SC200 proton facility's beam isocenter properties. First, mechanical deformation of the PBS nozzle, L-shape plate, and gantry were simulated using a Finite Element code, ANSYS. Then, the impact of the mechanical deformation on the beam's isocenter properties was evaluated using empirical formulas. In addition, we considered the simplest case that could affect the properties of the incident beam (i.e. if only the bending magnet (BG3) has an error in its mounting alignment), and the effect of the beam optics offset on the isocenter characteristics was evaluated. The results showed that the deformation of the beam position in the X and Y direction was less than 0.27 mm, which meets the structural design requirements. Compared to the mechanical deformation of the L-shape plate, the deformation of the gantry had more influence on the beam's isocenter properties. When the error in the mounting alignment of the BG3 is equal to or more than 0.3 mm, the beam deformation at the isocenter exceeds the maximum accepted deformation limits. Generally speaking, for the current design of the SC200 scanning beam delivery system, the effects of mechanical deformation meet the maximum accepted beam deformation limits. In order to further study the effect of the incident beam optics on the isocenter properties, a fine-scale Monte Carlo model including factors relating to the PBS nozzle and the BG3 should be developed in future research. |
| first_indexed | 2024-12-13T04:05:31Z |
| format | Article |
| id | doaj.art-b669c1e42b024697bbf750a38d999e9e |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-13T04:05:31Z |
| publishDate | 2020-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-b669c1e42b024697bbf750a38d999e9e2022-12-22T00:00:12ZengElsevierNuclear Engineering and Technology1738-57332020-09-0152920642071Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery systemMing Wang0Jinxing Zheng1Yuntao Song2Ming Li3Xianhu Zeng4Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, China; University of Science and Technology of China, Hefei, Anhui, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, China; Corresponding author.Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, China; University of Science and Technology of China, Hefei, Anhui, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, China; University of Science and Technology of China, Hefei, Anhui, ChinaInstitute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui, China; University of Science and Technology of China, Hefei, Anhui, ChinaFor proton pencil beam scanning (PBS) technology, the accuracy of the dose distribution in a patient is sensitive to the properties of the incident beam. However, mechanical deformation of the proton therapy facility may occur, and this could be an important factor affecting the proton dose distribution in patients. In this paper, we investigated the effect of deformation on an SC200 proton facility's beam isocenter properties. First, mechanical deformation of the PBS nozzle, L-shape plate, and gantry were simulated using a Finite Element code, ANSYS. Then, the impact of the mechanical deformation on the beam's isocenter properties was evaluated using empirical formulas. In addition, we considered the simplest case that could affect the properties of the incident beam (i.e. if only the bending magnet (BG3) has an error in its mounting alignment), and the effect of the beam optics offset on the isocenter characteristics was evaluated. The results showed that the deformation of the beam position in the X and Y direction was less than 0.27 mm, which meets the structural design requirements. Compared to the mechanical deformation of the L-shape plate, the deformation of the gantry had more influence on the beam's isocenter properties. When the error in the mounting alignment of the BG3 is equal to or more than 0.3 mm, the beam deformation at the isocenter exceeds the maximum accepted deformation limits. Generally speaking, for the current design of the SC200 scanning beam delivery system, the effects of mechanical deformation meet the maximum accepted beam deformation limits. In order to further study the effect of the incident beam optics on the isocenter properties, a fine-scale Monte Carlo model including factors relating to the PBS nozzle and the BG3 should be developed in future research.http://www.sciencedirect.com/science/article/pii/S1738573319306588SC200Proton therapyPBS nozzleGantryBeam isocenter properties |
| spellingShingle | Ming Wang Jinxing Zheng Yuntao Song Ming Li Xianhu Zeng Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system Nuclear Engineering and Technology SC200 Proton therapy PBS nozzle Gantry Beam isocenter properties |
| title | Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system |
| title_full | Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system |
| title_fullStr | Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system |
| title_full_unstemmed | Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system |
| title_short | Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system |
| title_sort | evaluation of the effect of mechanical deformation on beam isocenter properties of the sc200 scanning beam delivery system |
| topic | SC200 Proton therapy PBS nozzle Gantry Beam isocenter properties |
| url | http://www.sciencedirect.com/science/article/pii/S1738573319306588 |
| work_keys_str_mv | AT mingwang evaluationoftheeffectofmechanicaldeformationonbeamisocenterpropertiesofthesc200scanningbeamdeliverysystem AT jinxingzheng evaluationoftheeffectofmechanicaldeformationonbeamisocenterpropertiesofthesc200scanningbeamdeliverysystem AT yuntaosong evaluationoftheeffectofmechanicaldeformationonbeamisocenterpropertiesofthesc200scanningbeamdeliverysystem AT mingli evaluationoftheeffectofmechanicaldeformationonbeamisocenterpropertiesofthesc200scanningbeamdeliverysystem AT xianhuzeng evaluationoftheeffectofmechanicaldeformationonbeamisocenterpropertiesofthesc200scanningbeamdeliverysystem |