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双端口临时组织扩展器患者的剂量对剂量的物理贡献者,在乳房切除术后接受了10MVX射线治疗:蒙特卡洛研究

Ramon Ortiz¹, Bruce Faddegon¹, Manju Sharma¹

¹University of California San Francisco, Department of Radiation Oncology 1600 Divisadero Street, San Francisco, CA 94143, United States of America.

Biomedical physics & engineering express

|April 17, 2025

概括

这项研究调查了乳房切除术后放射治疗 (PMRT) 期间临时组织扩展剂 (TTEs) 的辐射相互作用. 双端口TTE降低了皮肤剂量,但没有产生有害的中子污染,改善了剂量测量理解.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射治疗剂量计放射治疗剂量计

背景情况:

乳房切除术后的放射治疗 (PMRT) 对于减少局部复发至关重要.
在乳房重建中使用临时组织扩张剂 (TTE),可能会改变辐射剂量分布.
了解与TTEs的辐射相互作用对于准确的PMRT剂量测量至关重要.

研究的目的:

为了评估双端口TTE对PMRT的剂量计影响,使用10 MVX射线.
用TTE量化个体辐射相互作用贡献 (光电效应,对产生,制动辐射,中子).
评估TTE存在对剂量分配和潜在中子污染的影响.

主要方法:

蒙特卡洛模拟被用于模拟带有双端口 AlloX2 TTE 的 PMRT.
模拟分析了辐射相互作用,包括光电效应,对产生,制动辐射和中子.
计算了剂量贡献和光中子产量,比较了带有和没有TTE的计划.

主要成果:

经过TTE的治疗,乳房皮肤的偏远剂量减少了高达19.3%的港口.
光电效应 (9%) 和制动辐射 (1%) 仅限于TTE港口;对生产在港口内贡献了20%.
配对生产增加了2.2 Gy的肺部和0.9 Gy的心脏剂量;TTE没有产生任何光中子.

结论:

双端口TTE显著改变PMRT剂量分布,主要是通过减少皮肤表面剂量.
在TTE内部的辐射相互作用,特别是对生成,有助于在风险器官中的剂量.
研究的TTE没有引入中子污染,证实了其在PMRT剂量计中的安全性.

关键词:

蒙特卡罗的蒙特卡罗是一个非常好的城市.光子中子和光子中子.乳房切除术后的放射治疗.暂时的组织扩展器

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