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• W3176678049 abstract "Daily anatomical deviations may distort the dose distribution in carbon ion radiotherapy (CIRT), which may cause treatment failure. Therefore, this study aimed to perform re-planning to maintain the dose coverage in patients with pancreatic cancer with passive scattering CIRT.Eight patients with pancreatic cancer and 95 daily computed tomography (CT) sets were examined. Two types of adaptive plans based on new range compensators (RCs) (AP-1) and initial RCs (AP-2) were generated. In AP-2, each beam was optimized by manually adjusting the range shifter thickness and spread-out Bragg peak size to make dose reduction by < 3% of the original plan. Doses of the original plan with bone matching (BM) and tumor matching (TM) were examined for comparison. We calculated the accumulated dose using the contour and intensity-based deformable image registration algorithm. The dosimetric differences in respect to the original plan were compared between methods.Using TM and BM, mean ± standard deviations of daily CTV V95 (%) difference from the original plan was - 5.1 ± 6.2 and - 8.8 ± 8.8, respectively, but 1.2 ± 3.4 in AP-1 and - 0.5 ± 2.1 in AP-2 (P < 0.001). AP-1 and AP-2 enabled to maintain a satisfactory accumulated dose in all patients. The dose difference was 1.2 ± 2.8, - 2,1 ± 1.7, - 7.1 ± 5.2, and - 16.5 ± 15.0 for AP-1, AP-2, TM, and BM, respectively. However, AP-2 caused a dose increase in the duodenum, especially in the left-right beam.The possible dose deterioration should be considered when performing the BM, even TM. Re-planning based on single beam optimization in passive scattering CIRT seems an effective and safe method of ensuring the treatment robustness in pancreatic cancer. Further study is necessary to spare healthy tissues, especially the duodenum." @default.
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• W3176678049 date "2021-06-19" @default.
• W3176678049 modified "2023-09-27" @default.
• W3176678049 title "Adaptive planning based on single beam optimization in passive scattering carbon ion radiotherapy for patients with pancreatic cancer" @default.
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• W3176678049 doi "https://doi.org/10.1186/s13014-021-01841-2" @default.
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