基于CAD的蒙特卡罗剂量计算系统用于评估碳离子辐射治疗中插入材料的几何效应
Min Cheol Han1, Yongdo Yun1, Taeho Kim1
1Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine, Seoul, Korea.
概括
一个新的基于计算机辅助设计 (CAD) 的蒙特卡洛 (MC) 系统准确地模拟了碳离子辐射疗法 (CIRT) 中植入的材料. 该工具通过预测由信托标记物和栓塞线圈引起的剂量分配变化来增强治疗规划.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算建模 计算建模
背景情况:
- 碳离子辐射疗法 (CIRT) 提供优越的瘤控制由于独特的物理和生物特性.
- 像信托标记器和栓塞线圈这样的植入材料可以破坏CIRT光束范围,使治疗计划复杂化.
- 准确的剂量计算对于有效和安全的CIRT输送至关重要.
研究的目的:
- 为CIRT开发和验证基于计算机辅助设计 (CAD) 的蒙特卡洛 (MC) 剂量计算系统.
- 评估植入材料对CIRT剂量分布的几何影响.
- 在医疗器械的存在下,提高治疗规划的准确性.
主要方法:
- 通过实验和模拟方法评估了一个黄金信托标记器和一个龙卷风栓塞微线圈.
- 用GafchromicTM EBT3薄膜测量剂量分布在固体水幻体中.
- 使用PArticle模拟工具 (TOPAS) 执行MC模拟,并使用验证的光束参数.
主要成果:
- MC模拟与实验剂量配置密切匹配,显示信托标记者的类似范围转移.
- 微线圈的方向对范围转移有很小的影响 (∼0.1毫米).
- 与简化模型相比,基于CAD的建模提供了更准确的几何表示.
结论:
- 开发的基于CAD的MC模拟系统可靠地评估CIRT中植入材料的剂量计影响.
- 该系统通过准确建模复杂结构,提高了对治疗计划的信心.
- 尽管计算要求很高,但系统能够结合绝对剂量数据的能力是有利的.
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