CAJ | 학술논문

目的通过比较乳腺摄影屏-片系统与计算机X射线摄影(CR)系统的曝光条件,以及不同曝光量对乳腺CR影像的影响,探讨乳腺CR摄影条件的优化原则.方法应用屏-片组合和CR,分别采用26、28、30 kV对fluke NA 18-220乳腺模体采用自动曝光控制(AEC)模式进行摄影,并记录曝光量数值(mAs),对CR影像进行处理.同时CR采用上述相同kV、照射野,以及不同的曝光量对模体进行摄影,并对CR影像进行不同的处理.所获图像由4位放射医师进行双盲阅片,按照美国放射学会(ACR)的评分标准评价打分.结果采用自动曝光模式,乳腺CR摄影的曝光量明显高于传统屏-片组合的曝光量;乳腺CR摄影的曝光量降低到标准自动曝光模式的1/2～1/3时仍能满足诊断要求,此时的曝光量较屏-片组合采用自动曝光模式的曝光量低.结论乳腺CR摄影采用不经重新校正的自动曝光模式时,曝光量明显增加;符合诊断要求的乳腺CR摄影所需曝光量可低于屏一片组合,合理使用CR是降低乳腺CR摄影剂量的关键.
목적 통과비교유선섭영병-편계통여계산궤X사선섭영(CR)계통적폭광조건,이급불동폭광량대유선CR영상적영향,탐토유선CR섭영조건적우화원칙.방법 응용병-편조합화CR,분별채용26、28、30 kV대fluke NA 18-220유선모체채용자동폭광공제(AEC)모식진행섭영,병기록폭광량수치(mAs),대CR영상진행처리.동시CR채용상술상동kV、조사야,이급불동적폭광량대모체진행섭영,병대CR영상진행불동적처리.소획도상유4위방사의사진행쌍맹열편,안조미국방사학회(ACR)적평분표준평개타분.결과 채용자동폭광모식,유선CR섭영적폭광량명현고우전통병-편조합적폭광량;유선CR섭영적폭광량강저도표준자동폭광모식적1/2～1/3시잉능만족진단요구,차시적폭광량교병-편조합채용자동폭광모식적폭광량저.결론 유선CR섭영채용불경중신교정적자동폭광모식시,폭광량명현증가;부합진단요구적유선CR섭영소수폭광량가저우병일편조합,합리사용CR시강저유선CR섭영제량적관건.
Objective To explore the optimal condition of mammography on computed radiology system (CRS)through comparing the exposal condition of mammography using radiology screen or film system (RSFS)and CRS,as well as the effect of difierent doses for CRS images.Methods The fluke NA18-220 mammographic phantom were photographed with 26,28 and 30 kV X-ray in automatic exposure control(AEC)model.And the exposure doses were recorded.the CRS images were processed.Subsequently the same mammographic phantom were photographed with the same kV of X-ray and irradiation field as well as different exposure doses in same model,and the CRS images were processed again.The images of SFS and CRS were read by four independent radiologists under mixed condition.The images of calcification.nylon fibers and masses were assessed by the four experienced readers according to the criterion of American College of Radiology.Results On the AEC model.the exposed dose of CRS was higher than that of RSFS,but the expesure dose lowered to the 1/2-1/3 of the former,the image quality may satisfy the clinical demand,and the exposed dose was lower than SFS.Conclusions The exposed dose may rise distinedy if the image is mken on CRS with no calibration AEC.and the image may satisfy the clinical demand with lower exposed dose,than RSFs.So how to use CRS reasonably plays a key role in mammography.