Interface dose perturbation as a measure of megavoltage photon beam energy.
Interface dose perturbation as a measure of megavoltage photon beam energy.
复制标题
界面剂量扰动作为兆伏光子束能量的测量。
DOI：
10.1118/1.596161
复制
发表时间：
1988
期刊：
影响因子：
3.8
通讯作者：
Gerbi,BJ
中科院分区：
文献类型：
--
作者：
Das,IJ;Khan,FM;Gerbi,BJ
光子束质量的描述通常由单个值来表征，例如半值层、有效衰减系数、百分比深度剂量，以及最近的电离比（IR）。虽然IR简单且易于测量，但其在高于10 MV的光子能量下缺乏灵敏度。本文描述了一种基于界面剂量扰动的方法，并定义了前向剂量扰动因子（FDPF）作为射束质量的度量。给出了两种方法在60 Co ~ 24 MV光子能量范围内的比较。结果表明，FDPF方法比IR方法对10 MV以上光子能量的光谱变化更敏感。
The description of the quality of a photon beam has usually been characterized by a single value such as the half‐value layer, the effective attenuation coefficient, the percent depth dose, and most recently by the ionization ratio (IR). Although the IR is simple and easy to measure, it lacks sensitivity at photon energies above 10 MV. This paper describes a method based on dose perturbation at an interface and defines the forward dose perturbation factor (FDPF) as a measure of beam quality. Comparisons between the two methods are given for photon energies ranging from60Co to 24 MV. The results show that the FDPF method is more sensitive to spectral changes at photon energies above 10 MV than the IR.