论文部分内容阅读
目的定量分析、比较非晶硅平板探测器X射线摄影系统与非晶硒平板探测器X射线摄影系统在不同成像剂量条件下成像质量的差别。方法以非晶硅平板探测器系统和非晶硒平板探测器系统分别摄取对比度-细节体模CDRAD2·0在相近曝光剂量条件下的X射线影像,由4位独立观察者分别阅读影像,并计算所对应的曝光剂量下图像质量因子(image quality figure,IQF),应用ANOVA分析两成像系统对比度及细节检测能力。使用X射线摄影统计学体模(TRG)测量两系统在不同曝光剂量条件下操作者特性曲线(receive operating characteristics,ROC),应用Wilcoxon检验分析、比较两种成像技术的影像信息检测能力的差别。结果在低曝光剂量条件下,两系统CDRAD体模影像IQF值及ROC曲线AZ值差别有显著意义,在对比度、组织细节检测能力上非晶硅平板探测器系统优于非晶硒平板探测器系统。在高曝光剂量条件下,两系统差异无统计学意义。结论在低曝光剂量条件下,成像质量非晶硅平板探测器系统优于非晶硒系统。在获得相同的影像质量的前提下,使用前者进行X射线摄影可以降低被检者受照剂量。
Objective To quantitatively analyze and compare the imaging quality of amorphous silicon flat panel detector X-ray radiography system and amorphous selenium flat panel detector X-ray radiography system at different imaging doses. Methods X-ray images of contrast-detail phantom CDRAD2.0 at different exposures were taken by an amorphous silicon flat panel detector system and an amorphous selenium flat panel detector system. Four independent observers respectively read the images and calculated The corresponding image quality figure (IQF) at the exposure dose was used to analyze the contrast and detail detection capabilities of the two imaging systems using ANOVA. The receiver operating characteristics (ROC) of the two systems at different exposure doses were measured by X-ray statistical phantom (TRG). Wilcoxon test analysis was used to compare the differences between the two imaging techniques in detecting image information. Results Under the condition of low exposure dose, the difference between IQF value and ROC curve AZ value of CDRAD phantom images of two systems was significant. The amorphous silicon flat detector system was superior to amorphous selenium flat detector system in terms of contrast and tissue detail detection ability . Under the condition of high exposure dose, there was no significant difference between the two systems. Conclusions Imaging quality amorphous flat panel detector system is superior to amorphous selenium system at low exposure dose. In the same image quality under the premise of using the former for X-ray photography can reduce the subject dose.