移动CR与移动DR在床旁胸部摄影中的应用比较

目的对比研究移动计算机X射线摄影（CR）与移动数字化X射线摄影（DR）在床旁胸部摄影中的临床应用价值。方法随机抽取移动CR与移动DR床旁胸部摄影胸片各200张,对2种摄影方式所摄胸片的图像质量及胸内各结构的显示进行对比研究。移动CR和移动DR各200张床旁胸部摄影胸片,以其CT检查为＂金标准＂进行对照,将两组床旁胸片显示的病灶清晰程度分为清晰、可见、模糊、隐约可见、未见5类。统计2组的例数,绘制接受者操作特征（ROC）曲线。结果图像质量：移动CR床旁胸部摄影所得胸片的甲级片率69.0%,乙级片率24.5%,丙级片率5.0%,废片率1.5%。移动DR床旁胸部摄影所得胸片的甲级片率83%,乙级片率16%,丙级片率1%,废片率0。对胸内各结构的显示：移动CR与移动DR床旁胸部摄影所得胸片对胸内各结构的显示率移动CR低于移动DR。对病灶的显示能力：200张移动CR胸片中,126例行CT检查,67例CT所显示的病灶中,移动CR能显示64例,3例未见病灶。200张移动DR胸片中,108例行CT检查,53例CT所显示的病灶中,移动DR能显示52例,1例未见病灶。移动CR与移动DR床旁胸部摄影ROC曲线下的面积分别为0.833和0.918。结论移动CR与移动DR床旁胸部摄影,移动DR摄影的影像质量、对胸内结构的显示及对病灶的显示能力均优于移动CR,在床旁胸部摄影中移动DR具有更高的应用价值。

Comparative study on mobile CR and mobile DR in bedside chest radiography

Objective To investigate the chnical value of mobile computed radiography（CR） and mobile digital radiography （DR） in beside chest radiography. Methods A total of 200 chest radiography films photographed by mobile CR and 200 chest radiography films by mobile DR performed at bedside randomly. The image quality and the ability of intrathoracic structure demonstration were compared between mobile CR chest film and mobile DR chest film. The CT was ＂golden standard＂, the lesion clarity in 200 mobile CR chest films and 200 mobile DR chest films were defined into 5 categories ie. clear, visible, fuzzy, visible vaguely and invisible. The number of cases in 2 groups was counted and receiver operating characteristic （ROC） curve was drawn. Results The imagings in mobile CR chest radiographs were 69.0 %, 24.5 %, 5.0 % and 1.5 % in class A, B, C and waste film respectively; while that in mobile DR bedside chest radiographs were 83 %, 16 %, 1% and 0 in different classes respectively. The display rate of intrathoracic structures in mobile DR was superior to mobile CR. In 200 mobile CR bedside chest radiographs were checked with CT for 126 cases and 67 lesion focuses were detected out but only 64 cases of lesion focus were showed with mobile CR. Among 200 mobile DR chest radiographs 128 were checked with CT and 53 lesion focuses were demonstrated but only 52 of them were displayed by DR. The area under curve （AUC） in mobile CR and mobile DR bedside chest radiograph were 0.833 and 0.918 respectively. Conclusion It is demonstrated that the image quality, the ability of intrathoracic structure demonstration by mobile DR in bedside chest radiography are superior to mobile CR. The clinical value of mobile DR is superior to mobile CR in bedside chest radiography.