在息性放射治疗中,用后部场的泡填充剂量测量表征
1Northwest Medical Physics Center, Lynnwood, WA, 98036; Kaiser Permanente, Seattle, WA, 98112.
概括
在骨转移的放射治疗中使用的薄泡片对深度辐射剂量 (≤1%) 的影响最小,但稍微增加表面剂量 (1-6.5%). 这种补丁可以提高患者的舒适度,而不会显著改变治疗疗效.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 放射治疗 物理 物理
背景情况:
- 为骨转移而接受息性辐射的患者经常在刚性治疗床上感到不舒服.
- 泡片有时用于改善患者在外部光束辐射治疗期间的位置和舒适性.
- 这些子的剂量计影响,特别是后梁,需要量化.
研究的目的:
- 量化薄泡片对辐射剂量传递的剂量计效应.
- 为了评估填充对患者舒适度和治疗准确度在息性放射治疗期间的影响.
- 为了评估补丁对穿过沙发和补丁的辐射束的影响.
主要方法:
- 离子室测量是在幻影中使用6 MV,10 MV和15 MV光子束进行的.
- 剂量测量数据在各种深度收集,包括最大剂量的深度和幻影表面.
- 用CT成像来评估泡在不同压力条件下的Hounsfield单位 (HU) 值.
主要成果:
- 泡片在最大剂量深度收集的信号中引起了最小的变化 (≤1%).
- 幻影表面的信号增加在测量到的光子束能量的1%至6.5%之间.
- CT分析显示,的平均HU值与空气相当,这表明电子密度最小.
结论:
- 在骨转移的息性辐射疗法中使用薄泡片对典型治疗深度的剂量影响微不足道.
- 表面剂量的轻微增加不太可能显著影响整体治疗结果.
- 泡填充可以安全地使用,以提高患者的舒适度,而不会影响辐射剂量传递的准确性.
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