改变辐射剂量范围对对玛射线的体内细胞遗传剂量反应的影响
1S.P. Grigoriev Institute for Medical Radiology and Oncology, National Academy of Medical Science of Ukraine, Kharkiv, Ukraine.
International journal of radiation biology
|April 22, 2024
概括
线性二进制 (LQ) 模型准确地描述了多达5 Gy的细胞遗传剂量反应. 除此之外,剂量响应曲线 (DRC) 变为 S 形,需要仔细选择剂量范围以获得准确的生物剂量计.
科学领域:
- 辐射生物学 辐射生物学
- 细胞遗传学 细胞遗传学
- 放射生物学的放射生物学
背景情况:
- 线性二进制 (LQ) 模型被广泛用于体外细胞遗传剂量反应.
- 在扩展的辐射剂量范围内,它的准确性可能受到限制.
- 了解剂量反应扭曲对于准确的生物剂量测量至关重要.
研究的目的:
- 分析文献数据关于体细胞遗传剂量对玛射线的反应.
- 为了检查LQ模型在扩展剂量范围上的扭曲.
- 确定最佳剂量范围,以适应生物剂量计中的LQ剂量响应曲线 (DRC).
主要方法:
- 从108个来源提取了暴露于急性玛射线的人类淋巴细胞的二心收益率数据.
- 将整体剂量响应数据 (高达50 Gy) 与分数-理性 (FR) 模型相匹配.
- 将LQ模型应用于特定数据集,改变最小和最大辐射剂量.
主要成果:
- LQ模型很适合5 Gy,但总体剂量反应显示S形,和剂量≥22 Gy.
- FR模型的"基本"LQ系数与已公布的数据一致,计算的异位数为17 Gy.
- 对LQ模型的最佳适合性是在特定的,较窄的剂量范围内实现的 (例如,0.11.0 Gy,5.920.3 Gy).
结论:
- 由于响应和,古典的LQ模型对5 Gy以上的细胞遗传剂量测量具有有限的适用性.
- LQ模型系数的变化取决于所选择的剂量范围.
- 在校准实验中优化最小和最大剂量可以提高LQ DRCs的适合性.
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