Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields
Hybrid pencil beam model (HPBM) based on photon characteristic line algorithm has been presented to get accurate three-dimensional (3D) dose distribution for lung radiotherapy in small fields. In the model, we introduced a scattering factor to accurately describe the transport behavior of scattered...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2022-11-01
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| Series: | Open Physics |
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| Online Access: | https://doi.org/10.1515/phys-2022-0194 |
| _version_ | 1811214322814156800 |
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| author | Cui Fengjie Gu Shaoxian Wang Ningyu Yin Chuou Zhang Shengyuan Hu Jinyou Cai Yunzhu Wu Zhangwen Gou Chengjun Wang Jun |
| author_facet | Cui Fengjie Gu Shaoxian Wang Ningyu Yin Chuou Zhang Shengyuan Hu Jinyou Cai Yunzhu Wu Zhangwen Gou Chengjun Wang Jun |
| author_sort | Cui Fengjie |
| collection | DOAJ |
| description | Hybrid pencil beam model (HPBM) based on photon characteristic line algorithm has been presented to get accurate three-dimensional (3D) dose distribution for lung radiotherapy in small fields. In the model, we introduced a scattering factor to accurately describe the transport behavior of scattered photons and secondary electrons, combined with the equivalent depth correction and the weighted density correction. The pencil beam kernels of heterogeneous lung phantoms were redefined by the scattering factor and depth dose for a reference field by photon characteristic line algorithm. Subsequently, the 3D dose distribution in lung phantoms with density of 0.1, 0.26, and 0.4 g/cm3, was calculated by the Finite-size pencil beam algorithm in five regular fields and an irregular field for 6 MV photon beam. The dose distributions obtained by the HPBM are in agreement with those obtained by the MC simulations, with a relative error of less than 3% in most of the cases. However, there are apparent discrepancies at media interfaces and lung anterior portion. Moreover, at media interfaces, relative dose errors of the two methods decrease with the increase in field size and lung density. The depth range in which relative errors is greater than 3% increases with the increase in field size at lung anterior portion. In these examples, maximum relative errors are between 5 and 29%. Nevertheless, it is shown that the HPBM based on photon characteristic line algorithm has potential research values in lung dose calculation under conditions of small fields. |
| first_indexed | 2024-04-12T06:01:22Z |
| format | Article |
| id | doaj.art-368869ca7f1647549482aa1ef12fb9a8 |
| institution | Directory Open Access Journal |
| issn | 2391-5471 |
| language | English |
| last_indexed | 2024-04-12T06:01:22Z |
| publishDate | 2022-11-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Physics |
| spelling | doaj.art-368869ca7f1647549482aa1ef12fb9a82022-12-22T03:45:01ZengDe GruyterOpen Physics2391-54712022-11-012011142115310.1515/phys-2022-0194Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fieldsCui Fengjie0Gu Shaoxian1Wang Ningyu2Yin Chuou3Zhang Shengyuan4Hu Jinyou5Cai Yunzhu6Wu Zhangwen7Gou Chengjun8Wang Jun9Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaKey Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, 610064, ChinaHybrid pencil beam model (HPBM) based on photon characteristic line algorithm has been presented to get accurate three-dimensional (3D) dose distribution for lung radiotherapy in small fields. In the model, we introduced a scattering factor to accurately describe the transport behavior of scattered photons and secondary electrons, combined with the equivalent depth correction and the weighted density correction. The pencil beam kernels of heterogeneous lung phantoms were redefined by the scattering factor and depth dose for a reference field by photon characteristic line algorithm. Subsequently, the 3D dose distribution in lung phantoms with density of 0.1, 0.26, and 0.4 g/cm3, was calculated by the Finite-size pencil beam algorithm in five regular fields and an irregular field for 6 MV photon beam. The dose distributions obtained by the HPBM are in agreement with those obtained by the MC simulations, with a relative error of less than 3% in most of the cases. However, there are apparent discrepancies at media interfaces and lung anterior portion. Moreover, at media interfaces, relative dose errors of the two methods decrease with the increase in field size and lung density. The depth range in which relative errors is greater than 3% increases with the increase in field size at lung anterior portion. In these examples, maximum relative errors are between 5 and 29%. Nevertheless, it is shown that the HPBM based on photon characteristic line algorithm has potential research values in lung dose calculation under conditions of small fields.https://doi.org/10.1515/phys-2022-0194hybrid pencil beam model based on photon characteristic line algorithmmonte carlo simulationsmall fieldslung phantom |
| spellingShingle | Cui Fengjie Gu Shaoxian Wang Ningyu Yin Chuou Zhang Shengyuan Hu Jinyou Cai Yunzhu Wu Zhangwen Gou Chengjun Wang Jun Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields Open Physics hybrid pencil beam model based on photon characteristic line algorithm monte carlo simulation small fields lung phantom |
| title | Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| title_full | Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| title_fullStr | Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| title_full_unstemmed | Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| title_short | Hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| title_sort | hybrid pencil beam model based on photon characteristic line algorithm for lung radiotherapy in small fields |
| topic | hybrid pencil beam model based on photon characteristic line algorithm monte carlo simulation small fields lung phantom |
| url | https://doi.org/10.1515/phys-2022-0194 |
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