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圆束计算机断层扫描 (CBCT) 引导的自适应增强辐射疗法,用于局部晚期宫癌患者,不适用于支臂疗法
Alice E Silberstein1, Joshua P Schiff1, Robbie Beckert1
1Department of Radiation Oncology, Washington University School of Medicine, St. Louis, USA.
Cureus
|September 5, 2024
概括
对于局部晚期的宫癌患者来说,无法接受胸膜疗法,形光束计算机断层扫描 (CBCT) 引导的自适应辐射增强为提供了可行且对剂量计有益的辐射疗法替代方案. 这种方法成功地调整了治疗计划,以避免对关键器官的毒性.
科学领域:
- 在瘤学瘤学.
- 辐射瘤学 辐射瘤学
- 医学物理 医学物理
背景情况:
- 支臂治疗对于局部晚期的宫癌至关重要,但资格不合格会导致不良结果.
- 立体性身体辐射疗法 (SBRT) 提升已经被探索,但毒性仍然是一个问题.
- 使用磁共振引导的自适应辐射增强正在为运动管理而出现.
研究的目的:
- 报告第一个形光束计算机断层扫描 (CBCT) 引导的适应性增强的病例,该病例发生在当地晚期的宫癌患者中,该患者不符合Brachytherapy的条件.
- 评估CBCT引导的适应性辐射用于增强治疗的可行性和剂量学益处.
- 评估适应性规划的能力,以管理处于危险的器官 (OAR) 的限制.
主要方法:
- 一名71岁的患有局部晚期子宫癌的女性,无法接受胸腔疗法,使用CBCT引导的自适应性辐射后化学辐射,在五个小部分中增加了25 Gy.
- 最初的规划涉及CT-MRI融合;每日千伏CBCT引导OAR轮调整和计划调整.
- 如果它们解决了OAR约束违规或改善了目标覆盖率,则使用适应计划,通过剂量-体积直方图进行比较.
主要成果:
- 适应的计划成功地实现了所有四个关键的OAR (直肠,西格,膀) 的硬约束.
- 最初的计划将在所有分数中违反OAR约束.
- 五个部分的平均治疗时间为58分钟.
结论:
- 以CBCT为指导的适应性增强是一种可行的方法,适用于局部晚期宫癌的不符合Brachytherapy患者.
- 适应性计划的适应表明了显著的剂量测量效益,解决了OAR约束违规问题.
- 需要进一步的大规模和长期研究来证实这种模式的有效性.
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