The application of the reduced dosage of the contrast medium with saline flushing in pulmonary angiography with gemstone CT

Objective:To discuss the feasibility of the reduced contrast dose with saline flushing in pulmonary CT angiography of patients with standard weight with gemstone CT.Methods:According to the contrast dose,40 patients with standard body weight(BWI 18.5~24.0㎏/㎡)undergoing computed tomography pulmonary angiography(CTPA)were randomly divided into 2groups:reduced contrast was treated with 15 mL contrast and 50 mL mixed solution(10% contrast and 90% saline)flushing,control group was treated 50 mL contrast and 30 mL saline flushing.The images were evaluated and analyzed by two experienced radiologists independently.Results:With rank sum test,the grading scores on the manifestation of the pulmonary artery and the posterior basal segmental pulmonary artery from the two radiologist were not significantly different between the two groups(P0.05).The grading scores on the manifestation of the vena cava from the two radiologists were significantly different between the two groups(P0.05).The differences of CT value between main pulmonary artery and left artium,the posterior basal segmental pulmonary artery and vein from the two radiologists between the two groups were not significantly different(P0.05).Conclusion:The good image quality is obtained with the reduced contrast dose with saline flushing in pulmonary CT angiography of patients with standard body weight with gemstone CT and is satisfied for clinical diagnosis.