自动管电压技术在腰椎外伤CT检查中的临床应用  

The clinical application of CARE kV technology in CT scanning of lumbar injury

作　　者：汪素涵 杨涛 万光宇 孔曙兵 余开湖 余维[1] WANG Suhan;YANG Tao;WAN Guangyu;KONG Shubing;YU Kaihu;YU Wei(Department of Medical Imaging,Clinical Medicine of Hubei University of Science and Technology,Xianning 437100,P.R.China;Department of Medical Imaging,Xianning Central Hospital,Xianning 437100,P.R.China)

机构地区：[1]湖北科技学院临床医学院放射科/全科医学实验实训中心,湖北咸宁437100 [2]湖北省咸宁市中心医院放射科,湖北咸宁437100

出　　处：《医学影像学杂志》2019年第4期649-652,661,共5页Journal of Medical Imaging

基　　金：国家自然科学基金资助项目(编号:61701174);湖北省教育厅科学研究计划资助项目(编号:B2013049)

摘　　要：目的探讨自动管电压技术在腰椎外伤CT检查中降低辐射剂量的应用价值。方法对80例腰椎外伤患者根据就诊顺序随机分为2组:A组43例、B组37例,A组采用自动管电压(CARE kV),参考管电压100kV,CARE Dose 4D自动mAs技术,螺距0.8,旋转时间1.0s进行扫描;B组采用固定管电压120kV进行扫描,其它扫描条件与A组相同。记录每次扫描的放射容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效剂量(ED)。对图像进行主观质量评分及测量客观图像噪声评估。结果 A、B两组有效剂量分别为(2.3±1.2)mSv、(3.6±1.5)mSv,A组与B组比较,平均有效剂量(ED)降低了36.1%;主观图像评分:骨窗A组和B组分别为(4.63±0.05)和(4.56±0.08);软组织窗分别为(4.71±0.06)和(4.66±0.13),两者差异没有统计学意义(P>0.05);客观图像质量评估:骨窗A、B两组SNR分别为(2.3±0.6)、(2.5±0.7);软组织窗A、B两组SNR分别为(5.7±1.4)、(6.1±0.9),两组间差异无统计学意义(P>0.05)。结论自动管电压技术在腰椎外伤CT检查中可以减少辐射剂量,图像质量能满足腰椎外伤的诊断要求,都能对腰椎外伤做出明确诊断。Objective To explore the value of intelligent optimal tube voltage scanning (CARE kV) in CT scanning of lumbar injury. Methods 80 patients with lumbar injury were divided into 2 groups according to the order of treatment: 43 cases in group A and 37 cases in group B. Group A was used CARE kV, Reference tube voltage 100 kV, CARE Dose 4D, pitch 0.8, Rotation time 1.0 s scan;Group B was sued Constant tube voltage 120 kV scan, other scanning conditions were the same as group A. The volume CT dose index (CTDIvol), the dose-length product (DLP) and effective dose (ED) were recorded. The subjective quality grade and the objeetive noise of all images were recorded and analysed statistically. Results The effective doses of groups A and B were (2.3±1.2) mSv and (3.6±1.5) mSv. The average effective dose (ED) of group A was reduced by 36.1% compared with group B. Subjective image quality score: for bone window in group A and B, the scores were (4.63±0.05) and (4.56±0.08);the soft tissue window was (4.71±0.06) and (4.66±0.13), the difference was not statistically significant ( P >0.05);objective image quality assessment: bone The SNR of the two groups was (2.3±0.6) and (2.5±0.7). The SNR of the soft tissue window in group A and B was (5.7±1.4) and (6.1±0.9). There was no significant difference between the two groups ( P >0.05). Conclusion CARE kV Technology of CT can reduce radiation dose in lumbar injury. Image quality can meet the diagnostic requirements, all of them could make a definite diagnosis of lumbar injury.

关 键 词：腰椎外伤 辐射剂量 自动管电压技术 体层摄影术 X线计算机 

分 类 号：R681.5[医药卫生—骨科学] R814.42[医药卫生—外科学]