Abstract：Objective: To explore low tube voltage and the low density contrast agents of the “double low” scan program on the feasibility of renal artery CTA. Methods: The 136 cases of abdominal CT angiography subjects were randomly divided into four groups by tube voltage and the concentration of contrast agent. Using the original image and the reconstructed post-processing image to measure and calculate objective indicators of renal artery and radiation dose results. Evaluating renal arteries and branch vessels showed the degree with Sahani 5 stars. Statisticing contrast agent incidence of adverse reactions. Results: Vascular CT values and CNR values were significant differences between the four groups of two(P<0.05); The CT values of background would rise, but noise would increase, when 100 kV of tube voltage would be used(P<0.05); There were no significant difference between the SNR values of group C and group D(P=0.342) only; Four groups of subjective image quality score was no significant difference(P>0.05). The radiation dose decreased by about 39%, when 100 kV of tube voltage would be used(P<0.05); Incidence of adverse reactions of C group and D group(used 270 mgI/mL contrast agent) were lower than A group and B group(used 350 mgI/mL contrast agent)(P<0.05). Conclusions: Using a low tube voltage, a low concentration of contrast agent scans can obtain satisfactory image quality renal artery CTA, reduce the radiation dose and the contrast agent adverse reactions.
2014, Vol. 25 
