Study of image quality and radiation dose with dual-energy technique in myocardial perfusion imaging using dual-source CT

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.