光子计数成像探测器位敏阳极研究  

Study on Position-Sensitive Anode in Photon Counting Imaging Detector

作　　者：刘永安[1,2] 李林森[1,2] 刘哲[1] 强鹏飞 刘舵[1,2] 盛立志[1] 田进寿[1] 赵宝升[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [2]中国科学院大学,北京100049

出　　处：《光学学报》2017年第4期47-53,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61471357;10878005)

摘　　要：楔条形位敏阳极属于电荷分割型阳极,其在光子计数成像探测器中的作用是对光子事件进行位置解码,阳极性能参数对探测器的成像性能有重要影响。对楔条形位敏阳极的极间电容进行研究,通过理论模型得到了阳极极间电容的计算表达式;设计并制作了不同参数的阳极面板,测试分析了阳极周期长度、绝缘沟道宽度、阳极收集面积和衬底材料等因素与阳极极间电容间的关系。阳极极间电容测试结果与理论计算值相符,极间电容计算值与测试值之间的偏差在10%以内。Wedge and strip anode（WSA） is one of charge division anodes. In the photon counting imaging detector, the role of the WSA is to decode the incident position of photon events. The anode performance parameters have an important influence on the imaging performance of the detector. The inter-electrode capacitance of WSA is studied, and its calculation formula is obtained by the theoretical model. The WSA panel with different parameters is designed and prepared. The relationship between cycle length, insulation gap width, anode collecting area, substrate material and the anode inter-electrode capacitance is analyzed. Test results show that the inter-electrode capacitance is in accordance with the theoretical calculation result and the deviation between calculated value and test value is within 10M.

关 键 词：探测器 光子计数成像 楔条形阳极 极间电容 空间分辨率 

分 类 号：TN23[电子电信—物理电子学] O434.2[机械工程—光学工程]