RESUMO
Objective To investigate the effect of a combination of second generation high pitch scanning technique of dual source CT and Iomeprol 400 on image quality,total iodine dose and injection speed.Methods Eighty-four patients with clinically suspected aortic disease underwent aorta CT angiography (CTA)were randomly divided into two groups (42 cases in each group).The experimental group used high pitch dual source CTA acquisition mode (pitch 3.2)combined with Iomeprol 400 contrast agent.The control group used conventional CTA scan mode combined with Iopamidol 370 contrast agent.The differences in image quality,effective radiation dose, total iodine dose and injection speed between two groups were compared.Results There were no statistical differences in CT value, signal-to-noise ratio,contrast-to-noise ratio and subjective image quality score between two groups (P>0.05).There were significant statistical differences in CTDIvol,DLP and CT value of the superior vena cava between two groups (P<0.01).The total iodine dose and injection speed were reduced in experimental group.Conclusion The combination of a high pitch scanning technique of aorta CTA with Iomeprol 400 contrast agent can reduce radiation dose and potential hazards of contrast agents on the premise of guaranteeing the image quality.
