CAJ | 학술논문

目的探索双下肢动脉CT血管成像(CTA)低剂量扫描的不同方法的差异,以及双下肢动脉CTA低剂量扫瞄三维处理(VR)图像的质量与血管CT值及标准差SD的关系.方法选取行双下肢动脉CTA检查的受检者90例.用随机数字表法分成3组,常规剂量组、120 kV和80 mAs组、100 kV和130 mAs组,每组30例.图像进行容积再现三维成像(VR)处理后,按优、良、差3个等级进行评定,对3组进行图像质量等级比较.测量CT值及标准差SD值,与VR图像质量等级关系进行受试者操作特性曲线(ROC)分析.结果常规剂量组(120 kV,150 mAs)、120 kV,80 mAs组和100 kV,130 mAs组VR图像等级为优的分别为93.3％、86.6％和96.6％.SD值与双下肢动脉CTA的VR图像的质量相关性分析ROC曲线下面积为0.9078,CT值与双下肢动脉CTA的VR图像的质量相关性分析ROC曲线下面积为0.9116.结论双下肢动脉CTA低剂量扫描切实可行,100kV和130 mAs组的图像质量优于120 kV和80 mAs组.
목적 탐색쌍하지동맥CT혈관성상(CTA)저제량소묘적불동방법적차이,이급쌍하지동맥CTA저제량소묘삼유처리(VR)도상적질량여혈관CT치급표준차SD적관계.방법 선취행쌍하지동맥CTA검사적수검자90례.용수궤수자표법분성3조,상규제량조、120 kV화80 mAs조、100 kV화130 mAs조,매조30례.도상진행용적재현삼유성상(VR)처리후,안우、량、차3개등급진행평정,대3조진행도상질량등급비교.측량CT치급표준차SD치,여VR도상질량등급관계진행수시자조작특성곡선(ROC)분석.결과 상규제량조(120 kV,150 mAs)、120 kV,80 mAs조화100 kV,130 mAs조VR도상등급위우적분별위93.3％、86.6％화96.6％.SD치여쌍하지동맥CTA적VR도상적질량상관성분석ROC곡선하면적위0.9078,CT치여쌍하지동맥CTA적VR도상적질량상관성분석ROC곡선하면적위0.9116.결론 쌍하지동맥CTA저제량소묘절실가행,100kV화130 mAs조적도상질량우우120 kV화80 mAs조.
Objective To explore the differences among CT angiography(CTA) at different doses in both lower extremity arteries,and the relationship among volume rendering(VR) image quality,CT number and standard deviation(SD) value.Method CTA in lower extremity artery was performed in 90 patients.The participants were randomly divided into three groups,including a routine group (120 kV,150 mAs),120 kV and 80 mAs group,and 100 kV and 130 mAs group with 30 cases in each group.The images were processed with VR and classified into three degrees,the first class,the second class and the third class,and VR image quality levels of three groups were compared.The receiver operating characteristic curve(ROC) was used to analyze the correlation among VR image quality level,CT number and SD value.Results The percentage of VR image level at the first class was 93.3％ in the routine group,86.6％ in the 120 kV and 80 mAs group and 96.6％ in the 100 kV and 130 mAs group.According to the correlation analysis between the SD value and VR image quality of CTA in lower extremity artery,the area under curve in ROC analysis was 0.9078.According to the correlation analysis between the CT number and VR image quality of CTA in lower extremity artery,the area under curve in ROC analysis was 0.9116.Conclusions The low-dose CAT in lower extremity artery is feasible.Application of 100 kV and 130 mAs could ensure better image quality.