位置敏感辐射探测系统（COCAE）放射源定位算法的模拟性能
Simulated Performance Of Algorithms For The Localization Of Radioactive Sources From A Position Sensitive Radiation Detecting System (COCAE)
摘要：
模拟研究的性能，定位点样放射源检测的位置敏感便携式辐射仪器（COCAE）的算法。利用列表模式极大似然期望最大化（LM-ML-EM）成像算法估计震源方向。此外，通过基于每个检测层的光峰计数信息、基于重建源图像的质量以及基于三角测量方法的三种不同算法来评估源到检测器的距离。这些算法已经测试了大量的模拟光子在一个很宽的能量范围内（从200 keV到2 MeV）的点状放射源位于不同的方向和源到探测器的距离发射。
英文摘要：
Simulation studies are presented regarding the performance of algorithms that localize point-like radioactive sources detected by a position sensitive portable radiation instrument (COCAE). The source direction is estimated by using the List Mode Maximum Likelihood Expectation Maximization (LM-ML-EM) imaging algorithm. Furthermore, the source-to-detector distance is evaluated by three different algorithms based on the photo-peak count information of each detecting layer, on the quality of the reconstructed source image as well as on the triangulation method. These algorithms have been tested on a large number of simulated photons in a wide energy range (from 200keV up to 2MeV) emitted by point-like radioactive sources located at different orientation and source-to-detector distances.
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