闪烁体特性对X射线探测器成像质量影响研究

Effects of scintillation characteristics on the imaging quality of X-ray detectors

间接式X成像探测器的核心部件是闪烁体,X射线激发闪烁体,其退激后产生的可见光被探测器接收成像。在不同能量X射线下,闪烁体特性如材料、厚度等对成像的空间分辨率以及图像衬度有较大影响。本文通过理论指导下的实验探究满足空间分辨率要求的闪烁体最佳厚度,通过对X射线能量在低能(150~400 keV)下不同材料闪烁体成像一致性校正后结果的分析得到了对应能量下性能较好的材料以及对应的厚度,与理论预测基本相符,为透镜耦合式X射线成像探测器的成像质量优化提供了指导。

The key component of an indirect X-ray imaging detector is the scintillator,which is excited by X-ray and the visible light generated after its de-excitation is received by the detector and forms an image.The characteristics of scintillator such as material and thickness have great influence on the spatial resolution and contrast of image at different X-ray energies.In this paper,the optimal thickness of scintillators that meet the requirements of spatial resolution is explored through experiments.With the consistency correction of X-ray images from scintillators of different materials at low energy(150~400 KeV),materials with better performance and the optimal thickness at corresponding energies were obtained.The results were consistent with theoretical predictions.It provides guidance for the optimization of image quality with a lens-coupled X-ray imaging detector.