在乳腺治疗中,用于体积调节弧度治疗门廊角度的两步光束几何优化
Mikko Hakala1, Luca Cozzi2,3, Elena Czeizler1
1Varian Medical Systems, a Siemens Healthineers Company, Helsinki, Finland.
Medical physics
|April 19, 2025
概括
自动化两步束几何优化 (2SBGO) 创建临床上可接受的乳腺癌VMAT计划与手动计划相比较. 这种方法节省了规划者的时间,并减少了计划质量的变化.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算生物学 计算生物学
背景情况:
- 乳腺癌的体积调节弧线疗法 (VMAT) 需要复杂的门架角度设置.
- 手动VMAT规划耗时且重复,影响效率.
- 现有的模板解决方案可能无法有效优化计划质量.
研究的目的:
- 开发和评估一个两步束几何优化 (2SBGO) 方法,用于乳腺癌中自动化VMAT规划.
- 自动选择VMAT门架角度,避免板块限制.
- 将2SBGO计划的剂量计质量与手工创建的计划进行比较.
主要方法:
- 实施了两步方法:初始角度确定 (模板,ML,手册),然后使用通用模拟化 (GSA) 进行剂量测量精细化.
- 训练有素的卷积神经网络 (CNN) 用于预测最佳光束角度.
- 测试了这种方法,对深呼吸的呼吸保持和自由呼吸的患者进行左侧和右侧乳房治疗.
主要成果:
- 2SBGO生产乳腺癌VMAT计划的剂量测量质量与手动计划相比较.
- 该方法成功地自动化了耗时的光束几何设置.
- 与手动角度选择相比,在右侧治疗中观察到较低的双侧肺剂量.
- 集成到2SBGO的机器学习模型显示出高效率,准确地预测角度.
结论:
- 2SBGO方法可自动生成临床上可接受的VMAT乳房图.
- 将初始光束几何设置与剂量测量精细化相结合,可确保设计质量.
- 这种自动化有可能大大节省时间,并减少辐射瘤学工作流程中的计划质量变化.
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