Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe
Abstract Inter-fractional tumor variance would lead to insufficient dosage or overdose in tumor region during lung cancer radiotherapy. However, previous works have not considered influence of inter-fractional tumor amplitude variance at treatment position due to lack of effective evaluation method...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-10-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-99489-1 |
| _version_ | 1818398726476005376 |
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| author | Yi Li Wenjing Wu Ruixin He Yongkai Lu Yuemei Zhang Long Wang Xiaozhi Zhang |
| author_facet | Yi Li Wenjing Wu Ruixin He Yongkai Lu Yuemei Zhang Long Wang Xiaozhi Zhang |
| author_sort | Yi Li |
| collection | DOAJ |
| description | Abstract Inter-fractional tumor variance would lead to insufficient dosage or overdose in tumor region during lung cancer radiotherapy. However, previous works have not considered influence of inter-fractional tumor amplitude variance at treatment position due to lack of effective evaluation method during radiotherapy, especially for lung tumor within the lower lobe. Our objective was to investigate inter-fractional tumor baseline shift and amplitude variance due to respiratory motion with 4DCBCT simulation and guidance during stereotactic ablative body radiotherapy (SABR) for lung tumor. Subject included 19 patients with lung tumor within the lower lobe. 4DCBCT-simulated images at treatment position were acquired sequentially to determine internal tumor volume (ITV) and reference tumor motion at simulation process. Compared with reference tumor motion, 95 4DCBCT-guided images were acquired during each treatment to evaluate inter-fractional tumor baseline shift and amplitude variance, which were − 0.0 ± 1.3 mm and − 0.2 ± 1.4 mm in left–right(LR) direction, 0.9 ± 2.3 mm and 0.4 ± 2.9 mm in superior-inferior (SI) direction, 0.1 ± 1.5 mm and − 0.4 ± 2.0 mm in anterior–posterior (AP) direction. ITV margin were 3.5 mm, 7.5 mm and 5.3 mm in LR, SI and AP directions with van Herk’s (Int J Radiat Oncol Biol Phys 52(5):1407–1422, 2002) formula. 4DCBCT simulation and guidance is a reliable method to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe. ITV margin of 3.5 mm, 7.5 mm and 5.3 mm in LR, SI and AP directions would ensure greater tumor coverage during SABR for lung tumor within the lower lobe. |
| first_indexed | 2024-12-14T07:09:22Z |
| format | Article |
| id | doaj.art-0a74e161fa854e7cacddea37a0e64f73 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-14T07:09:22Z |
| publishDate | 2021-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-0a74e161fa854e7cacddea37a0e64f732022-12-21T23:12:01ZengNature PortfolioScientific Reports2045-23222021-10-011111910.1038/s41598-021-99489-1Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobeYi Li0Wenjing Wu1Ruixin He2Yongkai Lu3Yuemei Zhang4Long Wang5Xiaozhi Zhang6Department of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityDepartment of Radiological Health, Xi’an Center for Disease Control and PreventionDepartment of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityDepartment of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityDepartment of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityDepartment of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityDepartment of Radiation Oncology, The First Affiliated Hospital of Xi’an Jiaotong UniversityAbstract Inter-fractional tumor variance would lead to insufficient dosage or overdose in tumor region during lung cancer radiotherapy. However, previous works have not considered influence of inter-fractional tumor amplitude variance at treatment position due to lack of effective evaluation method during radiotherapy, especially for lung tumor within the lower lobe. Our objective was to investigate inter-fractional tumor baseline shift and amplitude variance due to respiratory motion with 4DCBCT simulation and guidance during stereotactic ablative body radiotherapy (SABR) for lung tumor. Subject included 19 patients with lung tumor within the lower lobe. 4DCBCT-simulated images at treatment position were acquired sequentially to determine internal tumor volume (ITV) and reference tumor motion at simulation process. Compared with reference tumor motion, 95 4DCBCT-guided images were acquired during each treatment to evaluate inter-fractional tumor baseline shift and amplitude variance, which were − 0.0 ± 1.3 mm and − 0.2 ± 1.4 mm in left–right(LR) direction, 0.9 ± 2.3 mm and 0.4 ± 2.9 mm in superior-inferior (SI) direction, 0.1 ± 1.5 mm and − 0.4 ± 2.0 mm in anterior–posterior (AP) direction. ITV margin were 3.5 mm, 7.5 mm and 5.3 mm in LR, SI and AP directions with van Herk’s (Int J Radiat Oncol Biol Phys 52(5):1407–1422, 2002) formula. 4DCBCT simulation and guidance is a reliable method to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe. ITV margin of 3.5 mm, 7.5 mm and 5.3 mm in LR, SI and AP directions would ensure greater tumor coverage during SABR for lung tumor within the lower lobe.https://doi.org/10.1038/s41598-021-99489-1 |
| spellingShingle | Yi Li Wenjing Wu Ruixin He Yongkai Lu Yuemei Zhang Long Wang Xiaozhi Zhang Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe Scientific Reports |
| title | Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe |
| title_full | Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe |
| title_fullStr | Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe |
| title_full_unstemmed | Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe |
| title_short | Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe |
| title_sort | using 4dcbct simulation and guidance to evaluate inter fractional tumor variance during sabr for lung tumor within the lower lobe |
| url | https://doi.org/10.1038/s41598-021-99489-1 |
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