基于X射线连续谱的光子计数探测器能量标定方法

随着探测器技术的发展，具有能量分辨能力的光子计数探测器在X射线能谱CT成像中应用越来越广泛。能量与阈值的对应关系对能谱CT成像具有重要意义，受到实验条件的限制，目前的光子计数探测器的能量标定方法有一定的局限性。针对光子计数探测器的单像素标定问题，本文提出一种基于X射线光机连续谱的能量标定方法，通过建立和分析X光谱模型，利用光机连续谱中高能端的能量信息，得到阈值与能量之间的关系。实验结果表明该方法操作方便，对探测器单像素标定结果较为准确，对其他类型光子计数探测器的标定具有参考意义。 

Energy Calibration Method of the Photon Counting Detector Based on Continuous X-ray Spectrum

With the development of the detector technology, the energy discriminating photon counting detectors have been widely used in Spectral CT imaging. The relationship between energy and threshold is very important for Spectral CT Imaging. Being subjected to experiment conditions, the current energy calibration methods of photon counting detector have some limitations. In order to solve single pixel energy calibration of photon counting detector, this paper describes an energy calibration methods using continuous X-ray Spectrum. Energy information of the high energy end in continuous spectrum is used to determine the relationship between energy and threshold by building and analyzing X-ray model. Experimental results show that this method has the advantages of convenient operation and relatively accurate result, which can also be referenced by other energy calibration methods.