[使用电子蒙特卡洛算法对电子束进行有效的源至表面距离计算的可行性]
Shoma Okada1,2, Reina Goto2, Honomi Nishino2
1Department of Central Radiology, Kindai University Hospital.
Nihon Hoshasen Gijutsu Gakkai zasshi
|February 8, 2026
概括
使用电子蒙特卡洛 (eMC) 计算有效的源至表面距离 (SSD) 是可行的电子束辐射疗法. 这种方法与测量结果有很好的一致性,有助于准确的剂量计算.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算剂量计计算剂量计.
背景情况:
- 反正方法用于放射治疗中的剂量校正,但对于电子束无效.
- 对于精确的电子束剂量计,需要有效的源至表面距离 (SSD).
- 这种有效的SSD需要确定各种电子束能量和应用器尺寸.
研究的目的:
- 使用带有电子蒙特卡洛 (eMC) 算法的放射治疗计划系统计算有效的SSD.
- 为了评估eMC计算的有效SSD的有用性和准确性.
- 将eMC计算与电子束剂量测量的LINAC测量进行比较.
主要方法:
- 从dmax的吸收剂量比率计算出有效的SSD,在扩展SSD和不同的间隙条件下.
- 使用了eMC计算和线性加速器 (LINAC) 测量.
- 使用dmax的吸收剂量比率,有效SSD和距离校正因子来评估一致性.
主要成果:
- eMC计算显示与LINAC测量有很好的一致性,在dmax时吸收剂量比的差异为1.38%.
- 通过 eMC 计算的有效 SSD 值,在测量值的 5.40 厘米范围内达成一致.
- 在高能/大场和低能/小场条件下,有效SSD的差异较大.
结论:
- 有效SSD的eMC计算是电子束剂量计的一种可行的方法.
- 在eMC计算和测量之间的良好一致性验证了这一方法.
- 该eMC方法可用于放射治疗中测量值的比较验证.
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