兆伏光子束线性衰减系数的解析-经验计算
An Analytical-empirical Calculation of Linear Attenuation Coefficient of Megavoltage Photon Beams.
作者信息
Seif F, Tahmasebi-Birgani M J, Bayatiani M R
机构信息
Assistant professor, Department of Medical Physics and Radiotherapy, Arak University of Medical Sciences, Arak, Iran.
Professor, Department of Medical Physics and Radiotherapy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
出版信息
J Biomed Phys Eng. 2017 Sep 1;7(3):225-232. eCollection 2017 Sep.
BACKGROUND
In this study, a method for linear attenuation coefficient calculation was introduced.
METHODS
Linear attenuation coefficient was calculated with a new method that base on the physics of interaction of photon with matter, mathematical calculation and x-ray spectrum consideration. The calculation was done for Cerrobend as a common radiotherapy modifier and Mercury.
RESULTS
The values of calculated linear attenuation coefficient with this new method are in acceptable range. Also, the linear attenuation coefficient decreases slightly as the thickness of attenuating filter (Cerrobend or mercury) increased, so the procedure of linear attenuation coefficient variation is in agreement with other documents. The results showed that the attenuation ability of mercury was about 1.44 times more than Cerrobend.
CONCLUSION
The method that was introduced in this study for linear attenuation coefficient calculation is general enough to treat beam modifiers with any shape or material by using the same formalism; however, calculating was made only for mercury and Cerrobend attenuator. On the other hand, it seems that this method is suitable for high energy shields or protector designing.
背景
在本研究中，介绍了一种线性衰减系数的计算方法。
方法
基于光子与物质相互作用的物理原理、数学计算以及X射线光谱考虑，采用一种新方法计算线性衰减系数。对作为常用放射治疗修正剂的铈钨合金和汞进行了计算。
结果
用这种新方法计算得到的线性衰减系数值在可接受范围内。此外，随着衰减滤过器（铈钨合金或汞）厚度的增加，线性衰减系数略有下降，因此线性衰减系数的变化过程与其他文献一致。结果表明，汞的衰减能力约为铈钨合金的1.44倍。
结论
本研究中介绍的线性衰减系数计算方法具有足够的通用性，可通过相同的形式主义处理任何形状或材料的射束修正剂；然而，仅对汞和铈钨合金衰减器进行了计算。另一方面，这种方法似乎适用于高能屏蔽或防护装置的设计。
Zotero 插件