Dimitriou P, Tzimas J, Tsialas S
Eur J Nucl Med. 1984;9(5):229-32. doi: 10.1007/BF00448544.
A theoretical model is proposed to describe the effect of a scattering medium on the plane-source sensitivity of a collimated detector. According to this model the scatter fraction fs(z) of the system is a linear function of the thickness z of the scattering medium and for any collimator geometry depends on the photopeak energy and the window settings as well as on the geometrical and physical characteristics of the scintillation detector. To calculate the parameters of the linear function fs(z), physical constants from the literature were used. The validity of the model was verified by experimental data. The computed parameters were found to differ slightly from the experimental ones and the differences were attributed to several approximations made during the theoretical analysis. The approach used for the determination of these parameters has contributed to a better understanding of the physical meaning of the factors affecting the generation of the scattered radiation and its detection by scintigraphic imaging systems.
提出了一个理论模型来描述散射介质对准直探测器平面源灵敏度的影响。根据该模型，系统的散射分数fs(z)是散射介质厚度z的线性函数，对于任何准直器几何形状，它取决于光电峰能量、窗口设置以及闪烁探测器的几何和物理特性。为了计算线性函数fs(z)的参数，使用了文献中的物理常数。该模型的有效性通过实验数据得到验证。计算得到的参数与实验参数略有不同，这些差异归因于理论分析过程中所做的几个近似。用于确定这些参数的方法有助于更好地理解影响散射辐射产生及其在闪烁成像系统中检测的因素的物理意义。
