RESUMO
Objective To investigate the CT angiography techniques of the pulmonary artery and aorta at a time.Methods Twenty-three patients who underwent the 64-slice spiral CT examinations of pulmonary and aortic angiography at a time were analyzed retrospec-tively (Group A).Also,13 cases whose pulmonary angiography showed normal (Group B)and 13 cases whose aortic angiography showed normal (Group C)enrolled in this study as control groups.The contrast media dose and the radiation dose were analyzed among three groups.The abnormal blood vessels were observed,and the CT values of the normal pulmonary artery and aorta and the number of the pulmonary 4,5 grade were compared among all groups.Results The contrast media dose in Group A was more than that in Group B or Group C,but less than the sum of that in Group B and Group C.The radiation dose in Group A was equivalent to that in Group C,which was obviously less than the sum of that in Group B and Group C.Six of 23 cases were accurately diagnosed as pul-monary embolism,1 case as pulmonary malformation,4 cases as aortic dissection whose true and false lumens clearly showed with contrast,5 cases as aortitis,and 10 cases as aortic atherosclerosis.For the cases whose angiography showed normal,there was no statistically significance of the number of the 4,5 grade of pulmonary artery and the CT values of pulmonary artery and the aorta compared with those of the control group (P >0.05 ).Conclusion The 64-slice spiral CT can be used to complete pulmonary and aortic angiography at a time,and the contrast media dose and the radiation dose can be reduced obviously.