钼靶乳腺摄影屏片系统与CR系统的比较  

Molybdenum target mammography: a comparison between screen film and computed radiography

作　　者：宛然[1] 郭雪梅[1] 秦乃珊[1] 宋鲁新[1] 蒋学祥[1] 

机构地区：[1]北京大学第一医院医学影像科,北京100034

出　　处：《中国医学影像技术》2006年第12期1911-1914,共4页Chinese Journal of Medical Imaging Technology

摘　　要：目的比较乳腺摄影屏片系统与CR系统的图像，评价其在空间分辨率、噪声、感光特性、放射剂量等方面的差别。方法应用屏片系统与CR系统分别对线对卡和乳腺专用模体摄影，通过线对卡的图像观察其空间分辨率，通过对模体图像的评分分析，进行比较。结果①空间分辨率的测试，胶片10Lp／mm，CR3．7Lp／mm。②胶片自动曝光（AEC），评分平均为条组30分，斑点组21分，团块组30分。③胶片手动曝光，仅100～140mAs条件下的评分接近自动曝光的结果，其余条件图像评分较低。④CR手动曝光，评分随摄影条件的改变而改变。结论CR系统摄影条件选择范围宽，但较屏片系统高。屏片系统的空间分辨率优于CR系统，影响图像噪声的因素CR系统多于屏片系统。Objective Comparing the images of mammography using the screen film system （SFS） and the computed radiography system （CR）, to evaluate the differences in spatial resolution, noise, photosensitivity and exposure dose. Methods The images of line pair phantom and the specific mammography phantom were produced with SFS and CR respectively. Each image was evaluated and scored for comparison. Results ①The images of line pair phantom show 10 Lp/mm using SFS and 3.7 Lp/mm using CR; ②Using SFS with AEC, the score was 30 for the cords group, 21 for the spots group and 30 for the mass group; ③Using SFS with manual exposure, only when 100-140 mAs were selected, the scores of images were close to the results of using AEC; when other tube current was selected, the scores were low; ④Using CR with manual exposure, the scores of images were changing with the change of the selection of tube current. Conclusion The practicable range of tube current for CR was wider than for SFS, and the value of tube current was higher for CR than for SFS. The spatial resolution of SFS was higher than that of CR. There were more factors associated with noise found in CR than in SFS.

关 键 词：乳腺摄影 计算机X线摄影 屏片系统 

分 类 号：R814.4[医药卫生—影像医学与核医学]