使用光谱测量和蒙特卡洛模拟来研究电子支臂疗法源中源际和源内光谱变化的研究
Azin Esmaelbeigi1, Nada Tomic1, Jonathan Kalinowski1
1Medical Physics Unit, Department of Oncology, Faculty of Medicine, McGill University, Montreal, Quebec, Canada.
Medical physics
|January 6, 2026
概括
在Xoft电子支臂疗法 (eBT) 源光谱中的可变性经过实验和通过模拟进行了评估. 结果显示,光谱变化处于推范围之内,确保对临床剂量测量的影响最小.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 支臂疗法是一种手臂疗法.
背景情况:
- 许多电子支臂疗法 (eBT) 来源治疗表面病变.
- 手动组装导致输出频谱的来源间变化.
- 射线管的老化会导致源内部的光谱变化.
研究的目的:
- 调查 Xoft S7500 模型的源间和源内光谱变异性.
- 评估光谱变量的对剂量计的影响.
- 将实验测量与模拟进行比较.
主要方法:
- 使用Amptek X123 CdTe光谱仪测量了Xoft S7500的光谱.
- 用已知的放射性源校准的光谱仪.
- 评估源内变异性 (一个源,五个试验) 和源间变异性 (五个源).
- 使用E-Brachy软件对比测量与模拟.
- 分析了临床意义的深度-剂量曲线.
主要成果:
- 源内变异性显示变化系数从0.5%到9.8%.
- 来源间的变化显示,尖端和侧面测量之间的差异高达13.5%.
- 模拟的光谱证实了材料组成对峰值强度的影响.
- 深度剂量模拟显示材料组成之间差异很小 (<1.2%).
结论:
- 测量和模拟的Xoft S7500光谱的全面比较.
- 深度剂量曲线的差异在2%以内 (AAPM TG-56建议).
- 观察到的S7500模型的光谱变化处于可以接受的范围内.
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