节约骨髓的剂量计影响,用于针对局部晚期宫癌的强大优化IMPT
S C Kuipers1, J Godart1, A Corbeau2
1Department of Radiotherapy, Erasmus MC Cancer Institute - University Medical Center Rotterdam, Rotterdam, The Netherlands; Department of Medical Physics & Informatics, HollandPTC, Delft, the Netherlands.
概括
在本地晚期宫癌 (LACC) 患者的强度调节质子疗法 (IMPT) 中,节省骨髓 (BMS) 是可行的,风险器官 (OAR) 剂量适度增加. 在IMPT中建议BMS采用个性化的方法,以平衡好处和风险.
科学领域:
- 辐射瘤学 辐射瘤学
- 医学物理 医学物理
背景情况:
- 强度调节质子疗法 (IMPT) 为治疗局部晚期宫癌 (LACC) 提供了潜在的优势.
- 优化IMPT计划需要平衡目标覆盖率与降低对健康组织的剂量,包括骨髓和有风险的器官 (OAR).
研究的目的:
- 在LACC患者的IMPT中,研究骨髓节约 (BMS) 和输送到危险器官的剂量 (OAR) 之间的权衡.
- 评估骨髓剂量逐步降低对LACC的IMPT中OAR的剂量学影响.
主要方法:
- 20名LACC患者的IMPT计划的回顾性分析.
- 自动化治疗规划以逐步减少骨髓平均剂量,在1个 GyRBE 步骤.
- 评估骨髓剂量与膀,小肠,直肠和sigmoid的剂量之间的关系.
主要成果:
- 总共产生了140个IMPT计划,证明可以实现的骨髓剂量减少.
- 观察到1 GyRBE BMS的平均OAR剂量的适度增加,最大BMS的增加更大.
- 对于最大的BMS,平均OAR剂量增加了3.3 GyRBE (膀),5.8 GyRBE (直肠),3.9 GyRBE (小肠) 和2.7 GyRBE (sigmoid).对于最大BMS,平均OAR剂量增加了3.3 GyRBE (膀),5.8 GyRBE (直肠),3.9 GyRBE (小肠) 和2.7 GyRBE (sigmoid).
结论:
- 对于LACC患者来说,在IMPT中实现1 GyRBE BMS是可行的,对OARs的剂量测量影响有限.
- 进一步减少骨髓剂量可能会显著增加一些患者的OAR剂量.
- 在临床IMPT规划中建议采用个性化的方法,以评估BMS对个体患者的益处和风险.
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