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在超高剂量率电子辐射中,平均剂量率是O2消耗和H2产量的重要预测指标

Jacob P Sunnerberg¹, Rongxiao Zhang^1,2, David J Gladstone^1,2

¹Thayer School of Engineering at Dartmouth College, Hanover, NH, United States of America.

Physics in medicine and biology

|July 18, 2023

概括

平均剂量率在超高剂量率 (UHDR) 放射治疗期间显著影响反应性氧物种 (ROS) 生产. 较高的平均剂量率与减少的ROS和氧气消耗相关,这对于理解FLASH效应至关重要.

科学领域:

辐射瘤学辐射瘤学
放射化学放射化学是指辐射化学.
医学物理医学物理

背景情况:

超高剂量率 (UHDR) 放射治疗,包括FLASH效应,显示出减少正常组织损伤的前景.
闪电效应的基本机制,特别是反应性氧物种 (ROS) 和氧气消耗的作用,需要进一步阐明.
了解剂量速率参数对于优化UHDR放射治疗方案至关重要.

研究的目的:

调查UHDR放射治疗期间平均和瞬间剂量速率对ROS产生的影响.
确定这些剂量速率类型在调解FLASH效应中的作用.
量化氧气消耗和超氧化生产在超高温电流条件下的关系.

主要方法:

在水性白蛋白溶液上利用超高强度高强度电子辐射测量过氧化 (H2O2) 产量和氧气消耗 (ΔpO2).
通过调整源至表面距离 (SSD) 来改变瞬间剂量速率 (10^210^6 Gy s^-1).
通过改变线性加速器脉冲频率和SSD来操纵平均剂量速率 (0.141500 Gy s^-1).

主要成果:

随着平均剂量增加,H2O2的产生和氧气的消耗都减少了.
多变量分析证实,即时剂量率也影响了这些结果.
氧气消耗取决于初始氧气度;每mol消耗的O2产生7.51mol的H2O2.

结论:

平均剂量是UHDR放射治疗中ROS产生的重要预测指标.
增加平均剂量率导致氧气消耗和H2O2产量减少,为FLASH效应提供了洞察力.
这些发现对于推进UHDR放射治疗技术和优化治疗疗效至关重要.

关键词:

一个闪光灯.剂量速率是指剂量速率.氧气氧气氧气氧气辐射疗法辐射疗法有活性氧物种的反应性氧物种.超高剂量速率的超高剂量速率

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