在线适应性放射治疗中的适应性变化:从理想剂量到实际剂量
Hanna Malygina1, Hendrik Auerbach2, Marc Ries2
1Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Kirrberger Str. 100, 66421, Homburg/Saar, Germany. hanna.malygina@uks.eu.
概括
在线适应性放射疗法对前列腺癌患者保持了剂量计的好处,即使在治疗期间发生了解剖学变化. 这种适应性放射治疗方法确保了治疗的有效性,尽管每天的变化.
科学领域:
- 辐射瘤学 辐射瘤学
- 医学物理 医学物理
背景情况:
- 在线适应性放射疗法 (ART) 通过解决器官间的分数变化,提供了剂量学优势.
- 在适应过程中的部分内解剖变化可能会影响治疗的有效性.
研究的目的:
- 为了研究前列腺癌在线适应性放射治疗期间内断层解剖变化的剂量学影响.
- 评估在线ART的剂量测量效益是否保持,尽管在适应期发生了解剖学变化.
主要方法:
- 从8名接受Varian Ethos在线ART治疗的前列腺癌患者的155个分量的回顾性分析.
- 对非适应,适应和输送剂量分布之间的目标和有风险的器官的剂量-体积指标的比较.
- 使用预处理和预照射的圆束CT (CBCT) 扫描来评估解剖变化.
主要成果:
- 与未适应的计划相比,输送剂量分布在剂量学上仍然有利,尽管存在部分内解剖变化.
- 适应期间膀体积增加时,膀剂量指标得到改善.
- 适应和交付计划之间的小差异发生在很小一部分情况下,通常是由于气象等生理变化.
结论:
- 在线适应性放射疗法在前列腺癌的临床实践中显示了持续的剂量学优势.
- 这项研究证实了在线ART的稳定性,尽管在适应时间延迟期间发生的解剖学变异.
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