使用蒙特卡洛模拟和MRI-linac实验测量的电子回归效应的量化
Francesco Tortorelli1,2, Cristian Borrazzo2, Marica Masi2
1Department of Medical Physics, 'Tor Vergata' University of Rome, Rome, Italy.
Biomedical physics & engineering express
|October 30, 2024
概括
在MR导向放射治疗中,电子回归效应 (ERE) 随着辐射场大小的增加而增加. 蒙特卡洛模拟准确地预测了ERE剂量分布,并通过实验测量进行验证.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 图像技术技术的成像技术
背景情况:
- 磁共振导向辐射疗法将磁共振成像与线性加速器集成在一起,以实时调整治疗.
- 电子回归效应 (ERE) 是一种现象,可以影响放射治疗中的剂量分布,特别是在异质介质中.
研究的目的:
- 评估电子回归效应 (ERE) 对MR导向辐射疗法系统中的剂量分布的影响.
- 评估蒙特卡洛模拟在预测ERE诱导剂量变化的准确性.
主要方法:
- 使用MRIdian (ViewRay) 系统进行模拟和实验测量.
- 使用蒙特卡罗模拟和EBT3 Gafchromic薄膜剂量测量在一个模拟空气和肺间隙的水幻影.
- 调查了各种场面大小,并进行了马分析,以比较计算和测量剂量分布.
主要成果:
- 蒙特卡洛模拟显示了辐射场大小与ERE大小之间的直接相关性.
- 由于ERE观察到显著的剂量积累,根据场面大小,幻影材料 (空气/肺间隙) 和方向 (PDD/交叉线) 变化.
- 马分析证实模拟和测量剂量分布之间的良好一致性,2%/2毫米的合格率高于91.15%.
结论:
- 电子回归效应在MR导向放射治疗中显著影响剂量分布,特别是在更大的场面尺寸的情况下.
- 在MRIdian平台上的蒙特卡洛模拟可以准确计算ERE效应.
- 实验验证支持MC模拟在临床场景中预测ERE的可靠性.
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