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自动化宫癌的IMRT规划,使用尺寸缩放的基于先前的瓦尼拉贝叶斯优化.

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与手动规划相比,自动化强度调节辐射疗法 (IMRT) 对宫癌 (CaCx) 的规划使用维度缩放的先前瓦尼拉贝叶斯优化 (BO) 改善了风险节约器官. 这种高效的方法提供了可比的目标覆盖范围,可以集成到治疗计划系统中.

关键词:
在IMRT中,IMRT是IMRT.自动化规划自动化规划宫癌:子宫癌是一种癌症.高维贝叶斯优化高维贝叶斯优化超参数优化超参数优化

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科学领域:

  • 辐射瘤学 辐射瘤学
  • 医学物理 医学物理
  • 计算生物学 计算生物学

背景情况:

  • 放射治疗的手动逆规划是耗时且不一致的.
  • 自动化治疗规划可以解决诸如可变规划者经验和时间限制等挑战.
  • 强度调节放射治疗 (IMRT) 是一个复杂的规划过程.

研究的目的:

  • 调查维度缩放先前 (DSP) 瓦尼拉贝叶斯优化 (BO) 与日志预期改进 (logEI) 获取函数的有效性,用于自动化IMRT规划.
  • 在高维设置中,自动化强度调节放射治疗 (IMRT) 对于子宫癌 (CaCx) 的规划.
  • 将自动化计划与手动计划和其他BO方法进行比较.

主要方法:

  • 开发了一个基于Python的脚本,使用具有logEI的DSP Vanilla BO来优化CaCx的IMRT规划超参数.
  • 该方法被应用于30个被追溯选择的骨盆节阳性CaCx病例,使用Varian Eclipse治疗计划系统 (TPS).
  • 剂量计参数与手动规划,稀疏轴对齐子空间BO (SAASBO) 和基于标准的DSP瓦尼拉BO的停止进行了比较,遵循EMBRACE-II协议.

主要成果:

  • 与手动规划相比,DSP Vanilla BO计划显示出优异的剂量合规性和风险器官节省 (OAR) (p <0.05).
  • 对CTVN,PTV55,ITV45和PTV45的临床目标覆盖率得到充分维持.
  • DSP Vanilla BO实现了与SAASBO相比的剂量测量质量,但计算时间显著缩短 (∼94分 vs 360分钟). 添加停止标准进一步缩短了时间至44分钟左右.

结论:

  • DSP Vanilla BO自动化IMRT计划实现了可比的目标覆盖率,并改善了与手动计划相比的OAR节省.
  • 这表明DSP Vanilla BO是一个高效的,数据独立的方法来自动化IMRT规划.
  • 该方法适合整合到治疗计划系统中,有利于资源有限的诊所.