在日食建模方法中评估小场输出因子,使用代表性光束和用平均的电离室和二极管探测器测量的平均值测量的测量数据
Kunio Nishioka1, Yuki Kunii1, Yoshinori Tanabe2
1Department of Radiology, Tokuyama Central Hospital, 1-1 Kodacho, Shunan, Yamaguchi, 745-8522, Japan.
Physical and engineering sciences in medicine
|November 24, 2025
概括
这项研究表明,将测量输出因子 (OPF) 纳入放射疗法束建模中可以提高小场的精度. 纳入这些测量对于精确的处理规划至关重要,特别是对于1x1cm2或更小的领域.
科学领域:
- 医学物理 医学物理
- 放射治疗 物理 物理
- 剂量测量方法 剂量测量方法
背景情况:
- 放射治疗治疗计划系统 (RTPS) 通常使用代表性束数据 (RBD) 进行束模型.
- 对于小于3x3cm2的场面大小,RBD通常缺乏输出因子 (OPF) 测量.
- 目前对小场OPF的研究主要集中在塑料闪光灯探测器上.
研究的目的:
- 评估小场OPF测量对RTPS中光束建模精度的影响.
- 为了比较不同的光束建模方法:没有OPF的RBD,用OPF测量的RBD和基于测量的建模.
- 为了比较塑料闪电器的OPF值与离子室和二极管探测器的OPF值,用于小领域.
主要方法:
- 我们比较了三种光束建模方法:仅使用RBD,使用RBD测量小场OPF,以及基于测量的建模.
- 使用了一种新的测量方法,从离子室和二极管探测器中平均数据进行小场剂量测量.
- 从W2塑料闪光灯与平均离子室/二极管探测器值的OPF值进行了比较,跨越了各种能量和平整无波器 (FFF) 束.
主要成果:
- 有测量数据和没有测量数据的RBD建模之间的OPF计算差异在1x1cm2时为<1.5%,在2x2cm2时为<0.5%.
- 在RBD建模中,OPF差异随着现场尺寸的扩大而增加.
- 在矩形场中,在建模方法之间观察到显著的差异,特别是在上下扩张沿线.
结论:
- 小场OPF测量对于RTPS中精确的光束建模至关重要.
- 基于RBD的建模从包括测量的OPF中获得了显著的好处,特别是在小型和不规则形状的领域.
- 需要对涉及OPFs ≤1x1cm2的建模结果进行进一步评估,突出仅依赖RBD的局限性.
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