X线屏-片组合体系的ROC曲线及最大信息量检测的实验研究  

Experimental research on ROC curve and maximum information of X-ray screenfilm system

作　　者：袁聿德[1] 于兹喜[1] 王昌元 李月卿 冯树理 徐惠泰 

机构地区：[1]山医学院放射系

出　　处：《中华放射学杂志》1998年第8期567-570,共4页Chinese Journal of Radiology

摘　　要：目的通过实验取得有关数据，制作Ｘ线屏片组合体系的观测者操作特性（ｒｅｃｅｉｖｅｒｏｐｅｒａｔｉｎｇｃｈａｒａｃｔｅｒｉｓｔｉｃ，ＲＯＣ）曲线，并检测最大信息量（Ｉｍａｘ）。方法用直径２ｍｍ的丙烯树脂实球和空心球各１００个，在３种Ｘ线屏片组合体系，即扁平颗粒技术（新型屏片体系）、ＣａＷＯ４屏天津胶片、ＢａＦＣｌ∶Ｅｕ屏天津胶片所形成的影像，由３位医务工作者，在照度为６０００Ｌｘ观片灯上，用ｙｅｓ（Ｓ）－ｎｏ（Ｎ）２×２判断矩阵法取得数据，描绘ＲＯＣ曲线，并计算Ｉｍａｘ。结果（１）扁平颗粒技术得到的照片上检测的Ｉｍａｘ最大；对稀土ＢａＦＣｌ∶Ｅｕ屏天津片检测的Ｉｍａｘ最小。（２）对直径２ｍｍ的空心球丙烯树脂所形成的微小信息检测的Ｉｍａｘ值较直径２ｍｍ实球的为大。（３）工作２５年以上医师检测的Ｉｍａｘ值最大。结论（１）应用Ｘ线屏片组合体系所形成照片斑点少的扁平颗粒技术，检测到的Ｉｍａｘ值大，能提供给医师信息量大的Ｘ线照片影像。（２）应用稀土增感屏组成的屏片组合体系，形成照片斑点多，检测到的Ｉｍａｘ值小。Purpose To draw the ROC curve and obtain the maximum information according to the experimental data of Xray screenfilm systems. Methods 100 acrylic resin balls and 100 acrylic resin hollow balls 2mm in diameter were used to generate images on three screenfilm combinations: flat grain (new screenfilm system), CaWO4 screenTianjin film and BaFCl:Eu screenTianjin film. The ball images were analysed by two doctors and one student on a 6000 lux luminosity view box. The ROC curves were drawn and the maximum information (Imax) was calculated from the 2×2 evaluation matrix data got by means of answering yes(S)no(N). Results (1)The Imax measured on new screenfilm system was the largest, and that on the BaFCl screenTianjin film was the smallest. (2)The information quantity formed by 2mm in diameter hollow balls was greater. (3) The Imax measured by a doctor with over25year experience was the largest. Conclusion (1) The Imax from new screenfilm which had fewer film mottles was the largest.(2) Imax from the rare earth screenfilm system was the smallest.

关 键 词：X线胶片 X线增感屏 放射摄影术 ROC曲线 

分 类 号：R814[医药卫生—影像医学与核医学]