Value of dual flow rate scanning technique in the evaluation of renal blood vessels in living donor

Objective:To study the value of one-phase scan with dual flow rate technique in the preoperative evaluation of renal blood vessels in living donor.Methods:48 living renal donors were divided into 3 groups:Group Ⅰ(n=21),(Group Ⅱ(n=15),Group Ⅲ(n=12).CT angiography(CTA) with different techniques including auto touching off in the early artery phase,settled time at the arterial phase and venous phase and one phase scan with dual flow rate technique was performed in different groups separately.Post-processing techniques including VR,MIP,CPR were used to reconstruct the renal artery and vein and the image quality of these 3 groups were compared and analyzed.Results:The mean CT values of renal arteries and veins of the 3 groups were analyzed statistically,showing significant statistical differences(P0.05).The mean CT values of renal artery of the 3 groups showed GroupⅠGroup ⅡGroup Ⅲ;which of renal vein showed GroupⅠGroup Ⅲ GroupⅡ.The image quality of renal vein of these 3 groups were analyzed with Rank sum test showing that significant difference was existed in proportion of different grades among these three groups(P0.05),which means that difference of the image quality of renal vein were showed.Comparison of the image quality in each separated two groups,significant difference was showed between Group Ⅰ and Group Ⅱ;Group Ⅱ and Group Ⅲ(P0.05).No statistically significant difference was found between GroupⅠ and Group Ⅲ.According to the differences of CT value of renal artery and vein,the image quality was scored as good,fair and poor,showing that there were 6 cases,4 cases and 2 cases in each grade.Conclusion:Examination of renal artery and vein can be completed using dual-flow rate scanning with one-phase scan technique,and radio-exposure received by living donors could be greatly reduced,also ideal images could be obtained and requirement for diagnosis could be satisfied.