CAJ | 학술논문

目的对比研究全数字乳腺摄影系统(FFDM)与双面阅读CR乳腺摄影成像系统(DSCRM)辐射剂量与成像质量的关系.方法在相同的辐射剂量下用FFDM和DSCRM对ALVIM统计学乳腺摄影模体TRM进行曝光,记录摄影条件和模体表面入射剂量,然后固定此摄影条件kV值,选用不同mAs值用DSCRM对模体进行曝光,记录表面入射剂量,并将所获取的影像在图像诊断工作站显示器上由3位放射学专家进行视读打分,按照5分值判断法评判,绘制ROC曲线,计算出每种信号的判断概率值Pdet,对所得数据进行统计学分析.结果在辐射剂量为1.36 mGy时,FFDM所摄取模体影像内容物中不同直径钙化点和肿块灶的Pdet值分别是0.730 ～0.925和0.670～0.945,DSCRM所得模体影像内容物中不同直径钙化点和肿块灶的Pdet值分别是0.632～0.815和0.575～0.785.二者在1.35 mm肿块灶和0.40 mm钙化点用双因素方差分析(ANOVA)进行处理,(F=37.1,P＜0.05).在相同的判断概率值Pdet下,DSCRM所用表面入射剂量为1.63 mGy,腺体平均剂量为0.65 mGy,FFDM所用的表面入射剂量为1.36 mGy,腺体平均剂量为0.56 mGy,FFDM较DSCRM表面入射剂量减少了19.8％,腺体平均剂量减少16.0％.结论在相同曝光条件下,FFDM对模体内容物的检出率高于DSCRM；在获得相似图像质量时,FFDM的辐射剂量明显低于DSCRM.
목적 대비연구전수자유선섭영계통(FFDM)여쌍면열독CR유선섭영성상계통(DSCRM)복사제량여성상질량적관계.방법 재상동적복사제량하용FFDM화DSCRM대ALVIM통계학유선섭영모체TRM진행폭광,기록섭영조건화모체표면입사제량,연후고정차섭영조건kV치,선용불동mAs치용DSCRM대모체진행폭광,기록표면입사제량,병장소획취적영상재도상진단공작참현시기상유3위방사학전가진행시독타분,안조5분치판단법평판,회제ROC곡선,계산출매충신호적판단개솔치Pdet,대소득수거진행통계학분석.결과 재복사제량위1.36 mGy시,FFDM소섭취모체영상내용물중불동직경개화점화종괴조적Pdet치분별시0.730 ～0.925화0.670～0.945,DSCRM소득모체영상내용물중불동직경개화점화종괴조적Pdet치분별시0.632～0.815화0.575～0.785.이자재1.35 mm종괴조화0.40 mm개화점용쌍인소방차분석(ANOVA)진행처리,(F=37.1,P＜0.05).재상동적판단개솔치Pdet하,DSCRM소용표면입사제량위1.63 mGy,선체평균제량위0.65 mGy,FFDM소용적표면입사제량위1.36 mGy,선체평균제량위0.56 mGy,FFDM교DSCRM표면입사제량감소료19.8％,선체평균제량감소16.0％.결론 재상동폭광조건하,FFDM대모체내용물적검출솔고우DSCRM；재획득상사도상질량시,FFDM적복사제량명현저우DSCRM.
Objective To compare imaging quality and radiation dose on full-field digital mammography (FFDM) system and dual-sided reading CR mammography (DSCRM) system.Methods The TRM of ALVIM statistics phantom was exposed by FFDM system and (DSCRM) with the same radiation dose.The exposure parameters and the entrance surface dose (ESD) were recorded.Then,the phantom was exposed by DSCRM system with different mAs and same kV,and the ESD was recorded.The images obtained above were read by three radiologists on the monitor of diagnosis work station with the same window width and window level.The evaluation of the images were given using a five-level confidence scale.ROC curves were drawn and probability Pdet were calculated.Results The ROC analysis of microcalcifications and masses showed A(z) values of 0.730-0.925 and 0.670-0.945 for FFDM,and 0.632-0.815 and 0.575-0.785 for DSCRM when the radiation dose is 1.36 mGy.The radiation dose with DR system could be reduced compared with dual-sided reading CR system at the same probabilities Pdet,the ESD reduced from 1.63 mGy to 1.36 mGy by 19.8％,the AGD reduced from 0.65 mGy to 0.56 mGy by 16.0％.Conclusions The observable details with FFDM system were proved to be superior to DSCRM system at the same radiation dose.With the similar image quality,the radiation dose of FFDM system was less than the DSCRM system.