碘化铯和硫氯化钆在DR系统中剂量与图像质量的分析  

Comparative Analysis between Two Amorphous Silicon Flat-panel Detector: Radiation Dose and Image Quality

作　　者：张志奎 梁吉 

机构地区：[1]内蒙古自治区人民医院放射科,呼和浩特010017

出　　处：《北方药学》2014年第1期62-63,共2页Journal of North Pharmacy

摘　　要：目的:比较碘化铯和硫氧化钆2种闪烁体材料平板探测器的DR系统在不同成像剂量条件下图像质量的差别。方法:以碘化铯为闪烁体材料的平板探测器系统和以硫氧化钆为闪烁体材料的平板探测器系统分别摄取对比度-细节体模(CDRAD 2.0)在相近成像剂量条件下的X射线图像,计算所对应的成像剂量下图像质量因子反数值(image quality figure inverse,IQFinv),应用ANOVA分析2平板探测器对比度及细节检测能力,应用Wilcoxon检验分析、比较2种平板探测器的图像信息检测能力的差别。结果:在一定剂量范围内,2种平板探测器的图像质量均随着成像剂量的增加而增加(P<0.001)。在管电流量不同mAs时,2种非晶硅DR平板探测器的IQFinv值差异无统计学意义(P>0.05)。结论:成像剂量相同时,2种非晶硅平板探测器具有近似的图像质量,图像质量的提高与成像剂量的增加并不成线性关系。Objective：To assess and compare the image quality at different exposures ettings using cesium iodide （CsI） flat-panel detector digital radiography system and GOS flat-panel detector digital radiography system. Methods： The images of contrast-detail phantom （CDRAD2.0） were taken at different exposure settings for two flat-panel detector systems. The image quality figure inverse （IQFinv） for different dose settings was calculated. The detectability of two system in contrast and detail was analysed using ANOVA. The statistical significance was evaluated using the Wileoxon test between two system. Results： At certain dose range, the image quality improved with radiation dose increased for two amorphous silicon flat-panel detector system（P〈0.001 ）. At different mAs value of tube current dosage, the IQFinv was no of statistical significance between two system （P〉0.05）. Conclusion： At the same radiation dose, two flat-panel detector systems have approximately image quality. There is not linear relevance between image quality improvement and radiation dose augment.

关 键 词：平板探测器 辐射剂量 图像质量 

分 类 号：R814.49[医药卫生—影像医学与核医学]