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《Chinese Journal of Clinical Medicine》 2018-04
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Application of low tube voltage and low-concentration iodinated contrast with iterative reconstruction on aorta computed tomography angiography

HOU Kai;ZHOU Guo-feng;LU Xiu-liang;ZENG Meng-su;GU Jun-ying;Department of Radiology,Zhongshan Hospital, Fudan University,Shanghai Institute of Medical Imaging;  
Objective:To investigate the image quality and radiation dosage in the 320-slice thoracic and abdominal aorta computed tomography angiography(TAA-CTA)using low tube voltage and low-concentration contrast with iterative reconstruction.Methods:Eighty patients requiring TAA-CTA were randomly divided into two groups(40 patients in each group).Patients in group A received CTA scan with 120 kVp and 370 mgI/mL of contrast media.Meanwhile,patients in group B received CTA scan with 80 kVp and 300 mgI/mL of contrast media.SURE Exposure 3 Dtechnique and adaptive iterative dose reduction(AIDR)3 Dwere adopted for both two groups.Image quality,signal-to-noise ratio(SNR),and radiation dose were evaluated on all of the images.Results:There was no significant difference in age,BMI,and five segmental images quality evaluation between the two groups.CT values of five segmental arterial lumina in group B were higher than that in group A,and difference was obviously significant(P0.05).SNRs of five segmental arterial lumina in group B were also higher than those in group A.Statistical differences were remarkably significant(P0.05)in SNRs of four segmental arterial lumina excluding that of femoral artery.Valid radiation dosage in group B was 55%,which was lower than that in group A with a significant statistical difference(P0.05).Valid iodine intake was reduced by 18.92% in group B than that in group A.Conclusions:Low-concentration iodinated contrast(300 mgI/mL)and 80 kVp ultra-low tube voltage with AIDR 3 Diterative reconstruction for patients requiring TAA-CTA could reduce the radiation dosage and iodine intake without weakening image quality.
【CateGory Index】: R816.2;R543.1
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