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- W2022373668 abstract "Purpose: To investigate the impact of rotational (roll, yaw, and pitch) errors in proton therapy planning of lung cancer. Methods: A lung cancer case treated at our center was used in this retrospective study. The original plan was generated using two proton fields (posterior-anterior and left-lateral) with XiO treatment planning system (TPS) and delivered using uniform scanning proton therapy system. First, the computed tomography (CT) set of original lung treatment plan was re-sampled for rotational (roll, yaw, and pitch) angles ranged from −5° to +5°, with an increment of 2.5°. Second, 12 new proton plans were generated in XiO using the 12 re-sampled CT datasets. The same beam conditions, isocenter, and devices were used in new treatment plans as in the original plan. All 12 new proton plans were compared with original plan for planning target volume (PTV) coverage and maximum dose to spinal cord (cord Dmax). Results: PTV coverage was reduced in all 12 new proton plans when compared to that of original plan. Specifically, PTV coverage was reduced by 0.03% to 1.22% for roll, by 0.05% to 1.14% for yaw, and by 0.10% to 3.22% for pitch errors. In comparison to original plan, the cord Dmax in new proton plans was reduced by 8.21% to 25.81% for +2.5° to +5° pitch, by 5.28% to 20.71% for +2.5° to +5° yaw, and by 5.28% to 14.47% for −2.5° to −5° roll. In contrast, cord Dmax was increased by 3.80% to 3.86% for −2.5° to −5° pitch, by 0.63% to 3.25% for −2.5° to −5° yaw, and by 3.75% to 4.54% for +2.5° to +5° roll. Conclusion: PTV coverage was reduced by up to 3.22% for rotational error of 5°. The cord Dmax could increase or decrease depending on the direction of rotational error, beam angles, and the location of lung tumor." @default.
- W2022373668 created "2016-06-24" @default.
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- W2022373668 date "2014-05-29" @default.
- W2022373668 modified "2023-09-22" @default.
- W2022373668 title "SU-E-T-170: Evaluation of Rotational Errors in Proton Therapy Planning of Lung Cancer" @default.
- W2022373668 doi "https://doi.org/10.1118/1.4888499" @default.
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