摘要
目的:探讨运用双源CT双能量技术行冠状动脉血管成像的图像质量和辐射剂量。方法:204例患者分为两组行双源CT冠状动脉血管造影检查,A组采用双能量扫描方案,B组采用传统单能量扫描方案,比较两组的图像质量及辐射剂量。结果:A、B两组冠状动脉图像质量评分分别为(4.70±0.72)分、(4.70±0.71)分,两组间差异无统计学意义(t=-1.000,P=0.318)。A、B两组图像左、右冠状动脉信噪比(SNR)分别为A组20.0±3.4和19.0±3.0、B组20.1±3.2和19.9±3.2,且两组间差异均无统计学意义(t=1.967,P=0.051;t=-0.233,P=0.816)。A、B两组的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED)分别为(48.27±8.70)mGy、(54.10±8.77)mGy;(565.63±115.48)mGy.cm、(702.75±144.04)mGy.cm;(9.62±1.96)mSv、(11.95±2.45)mSv,A组的CTDIvol、DLP及ED明显低于B组,差异均有统计学意义(t=-4.764,P=0.000;t=-7.501,P=0.000;t=-7.501,P=0.000)。结论:双能量心肌灌注成像技术在不降低图像质量的情况下,能够显著降低患者的有效辐射剂量,有很高的临床应用价值。
Objective：To investigate the image quality and radiation dose of dual-energy technique for myocardial perfusion imaging with dual source CT.Methods：204 patients undergone coronary CT angiography（CTA） were divided into two groups,group A with dual energy CT and group B with single-energy scanning protocol respectively.The radiation dose and image quality of these two groups were compared.Results：The image quality scores of coronary artery for group A and group B were 4.70±0.72 and 4.70±0.71,respectively,with no statistic difference（t=-1.000,P=0.318）.The signal noise ratio（SNR） of left and right coronary artery in group A and group B were 20.0±3.4,19.0±3.0 and 20.1±3.2,19.9±3.2 respectively,with no statistic difference（t=-0.233,1.967,P=0.816,0.051）.The CT dose index of volume（CTDIvol）,dose length product（DLP） and effective dose（ED） were（48.27±8.70）mGy,（565.63±115.48）mGy·cm,（9.62±1.96）mSv respectively for group A and（54.10±8.77）mGy,（702.75±144.04）mGy·cm,（11.95±2.45）mSv respectively for group B.The CTDI vol and ED of group A were obviously lesser than that of group B,with significant statistic difference（t=-4.764,P=0.000;t=-7.501,P=0.000;t=-7.501,P=0.000）.Conclusion：Using the dual-energy technique with dual source CT for myocardial perfusion imaging can obviously reduce the radiation dose while with no influence on image quality,which provides great potential in clinical application.
出处
《放射学实践》
2012年第10期1095-1099,共5页
Radiologic Practice
