在带有双层MLC的环形Linac机器上进行小场剂量测量
Antonella Fogliata1, Antonella Stravato2,3, Francesca Dusi4
1Humanitas Research Hospital IRCCS, Radiotherapy and Radiosurgery Dept, Milan-Rozzano, Italy.
Medical physics
|January 30, 2026
概括
瓦里亚的哈尔基昂是他的血统.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
背景情况:
- 与双层MLC和6 MV FFF光束的Varian Halcyon线性加速器 (linac) 越来越多地用于处理小目标体积.
- 在这个平台上,对小静态场的精确剂量计算是一个重大问题.
研究的目的:
- 调查来自Halcyon双层MLC的小静态场的剂量准确性.
- 在 Eclipse 中使用 Acuros XB (AXB) 版本 16.1,18.0 和 18.1.1. 评估这些字段的建模.
主要方法:
- 使用微钻和微探测器对TRS-483.3的小领域 (0.5-4厘米) 测量轴上场输出因子 (FOF).
- 将探测器测量与Eclipse v16.1,v18.0和v18.1.1中的AXB计算进行比较.
- 分析了个人资料,半阴影,并评估了临床大脑VMAT计划.
主要成果:
- 探测器的一致性在±0.5%范围内;与供应商数据的差异为1.1%-1.8%的1厘米字段.
- AXB v16.1低估了0.5x0.5厘米2的FOF高达-27%;v18.x同意在~2%的范围内.
- Y半阴模拟是不完整的,v16.1显示在一个临床案例中具有小场的中心低剂量.
结论:
- 阿库罗斯XB版本18.x及后版本显著提高了Halcyon linac.的小场准确性.
- 不完整的Y半影建模仍然存在,这突出了对小领域进行仔细处理规划和优化约束的需要.
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