全数字乳腺摄影系统与屏片系统影像质量和辐射剂量的比较  

Comparison of Imaging Quality and Radiation Dose Between Full-fi eld Digital Mammography System and Screen-Film Mammography System

作　　者：王恒地[1] 李增友[1] 赵永霞[2] 

机构地区：[1]河北大学附属医院设备处,河北保定071000 [2]河北大学附属医院放射科,河北保定071000

出　　处：《中国医疗设备》2014年第3期157-158,127,共3页China Medical Devices

基　　金：河北省科技支撑计划项目(13277734D);河北大学医工交叉研究中心开放基金资助项目(BM201106);河北大学医学学科专项资金建设项目(2012B3004)

摘　　要：目的探讨全数字乳腺摄影系统(FFDM)与屏片系统(SFM)在乳腺摄影中影像质量、辐射剂量的差异。方法用Giotto乳腺摄影机对乳腺模体进行屏片摄影,摄影选用自动曝光控制模式(AEC),曝光采用2档,记录摄影条件和辐射剂量,然后在FFDM上用相同剂量的摄影条件对模体进行摄影,记录摄影条件。固定屏片系统摄影条件的28 kV不变,变动mAs为70、65、60、55 mAs对模体进行摄影摄取模体影像,记录屏片系统的辐射剂量。固定FFDM摄影条件的28 kV不变,变动mAs为28、32、36、45 mAs对模体进行摄影摄取模体影像,记录屏片系统的辐射剂量。由2位影像学医师在相同条件下对上述模体影像进行软阅读,并按照美国放射学会(ACR)的评分标准对模体中的钙化点、尼龙纤维、肿块灶进行评分,对所得数据进行单因素方差分析(one away ANOVA),2名医师对图像质量评价的一致性评估采用Kappa检验。结果在相同表面入射剂量下,FFDM影像质量高于SFM的影像质量(P<0.05);在两种乳腺摄影系统的影像质量相同时,FFDM较SFM表面入射剂量低35.3%,FFDM较SFM腺体平均剂量低37.1%。结论全数字乳腺摄影系统在AEC条件下,影像质量优于屏片乳腺摄影系统。在辐射剂量相同时,全数字乳腺摄影系统的影像质量优于屏片系统。Objective To compare the imaging quality and radiation dose between full-filed digital mammography （FFDM） system and screen-film mammography （SFM） system. Methods Screen-film mammography of breast phantom was conducted. Automatic exposure photography control mode with 2 stops was used. Imaging condition and radiation dose were recorded. Then the above process was conducted with full-filed digital mammography. Subsequently condition maintained as 28 kV, the phantom with SFM system was exposed by varying mAs （70 mAs, 65 mAs, 60 mAs, 55 mAs）, then the phantom with FFDM system was exposed by varying mAs （45 mAs, 36 mAs, 32 mAs, 28 mAs） also under the condition of 28 kV, and the radiation dose was recorded. Two independent radiologists read the images on monitor with the same window width and window level. The images of specks groups, nylon fibers and masses were assessed according to the standard of American College of Radiology （ACR）. Statistical analysis was performed using one-way analysis of variance and kappa test to assess the consistency of the two radiologists. Results The image quality of FFDM was proved to be superior to SFM （P〈0.05） with the same radiation dose. When the image quality of the two systems was same, the radiation doses were different, the ESD of FFDM system was reduced by 35.3% than SFM system, and the AGD was reduced by 37.1% than SFM system. Conclusions The image quality with FFDM system was proved to be superior to SFM system under the same exposure condition of ACE. When the radiation dose was similar, the image quality with FFDM was also better than the SFM system.

关 键 词：全数字乳腺摄影系统 屏片乳腺摄影系统 影像质量 辐射剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学] R737.9[医药卫生—放射医学]