器官剂量调制和3D智能毫安调制在CT肺动脉血管造影检查影像质量和辐射剂量的比较研究  

Comparison of organ dose modulation and 3D Smart mA in CT pulmonary angiography image quality and radiation dose

作　　者：赵永霞[1] 李冬雪 张天乐[1] 耿雪 徐艺泽 左紫薇 ZHAO Yongxia;LI Dongxue;ZHANG Tianle;GENG Xue;XU Yize;ZUO Ziwei(Department of Radiology,the Affiliated Hospital of Hebei University,Baoding,Hebei Prorince 071000,China)

机构地区：[1]河北大学附属医院放射科,河北保定071000

出　　处：《实用放射学杂志》2021年第2期304-308,共5页Journal of Practical Radiology

基　　金：河北省政府资助临床医学优秀人才培养和基础课题研究项目(361007);河北大学2019年研究生创新资助项目(hbu2019ss037);河北省重点研发计划项目(203777650);河北省2020年度医学科学研究课题计划项目(20200572);河北大学附属医院重点基金项目(2019Z004).

摘　　要：目的探讨器官剂量调制(ODM)技术和3D智能毫安(mA)调制技术在CT肺动脉血管造影(CTPA)中影像质量和辐射剂量的比较研究。方法前瞻性连续收集行CTPA检查的300例女性患者根据扫描方案不同分为Ⅰa~Ⅰb,Ⅱa~Ⅱb,Ⅲa~Ⅲb 6个亚组。其中Ⅰa、Ⅱa和Ⅲa亚组患者使用ODM技术进行检查;Ⅰb、Ⅱb和Ⅲb亚组患者使用3D智能mA调制技术进行检查。对所有图像进行测量和计算,得到所有图像的信噪比(SNR)、对比噪声比(CNR)、主观评分值、mA平均值及辐射剂量平均值。对6个亚组患者的主观评分值、SNR、CNR及辐射剂量平均值进行统计学分析。结果6个亚组患者CTPA图像的SNR值分别为23.6±2.9、23.9±3.2、22.9±2.5、23.1±2.6、22.1±2.6、22.7±3.1。CNR值分别为25.9±3.2、26.6±3.5、25.1±2.3、25.8±2.9、24.9±3.2、25.3±3.7。主观评分值分别是4.51±0.66、4.55±0.62、4.49±0.64、4.52±0.62、4.48±0.63、4.52±0.65。上述数据经统计学分析均无统计学差异(P>0.05)。但Ⅰa、Ⅱa和Ⅲa亚组的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)和有效剂量(ED)的平均值较Ⅰb、Ⅱb和Ⅲb亚组的平均值分别减少37.37%、36.33%和36.03%。结论与3D智能mA调制技术相比,ODM技术可以在保证临床诊断(图像质量)前提下更有效降低CTPA检查的辐射剂量,减少对电离辐射敏感器官(乳腺组织)的吸收剂量。Objective To investigate the differences in image quality and radiation dose for CT pulmonary angiography(CTPA)by using organ dose modulation(ODM)technique and 3D Smart mA modulation tchcriqpe.Methols Three hundred female patients who underwent CTPA were equally divided into six subgroups(n=50)acording to the scan protool:Ⅰa-Ⅰb,Ⅱa-Ⅱb,and Ⅲa-Ⅲb.The patients in subgroups Ⅰa,Ⅰa,and Ⅲa underwent ODM tchnique.The remaining patients in subgroups Ⅰb,Ⅱb and Ⅲb underwent 3D Smart mA modulation technique.The signal-to-noise ratio(SNR),contrast-to noise ratio(CNR),subjective score,mean mA value,and mean radiation dose value of all images were obtained and calculated after CTPA The data of six subgroups were compared using SPSS 19.0 statistical software.Results TheSNR,CNR and subjective scores in the six subgroups showed no significant dffrences(23.6±2.9,23.9±3.2,22.9±2.5,23.1±2.6,2.1±2.6,227±3.1;25.9±3.2,26.6±35,25.1±23,25.8±29,24.9±32,25.3±3.7 and 4.51±0.66,455±0.62,49±0.64,4.52±0.62,4.48±0.63 and 4.52±0.65).The.mcan values of volume CT dose index(CTDIvol)dose length product(DLP)and efective dose(ED)of subgroups Ia,Ⅱa and Ⅲa were significantly decreased by 37.37%,36.33% and 36.03% when compared to subgroups Ⅰb,Ⅱ b and Ⅲb,respectively.Concluson The radiation dose were more effectively reduced in ODM technique than that in 3D Smart mA modulation technique for CTPA,with maintaining image quality,and reducing the absorbed breast dose.

关 键 词：器官剂量调制 3D智能毫安调制 辐射剂量 影像质量 计算机体层成像 

分 类 号：R814.2[医药卫生—影像医学与核医学] R814.49[医药卫生—放射医学]