中国全科医学2017，Vol.20Issue(9)：1127-1131,5.DOI:10.3969/j.issn.1007-9572.2017.09.020
双源CT"双低方案"在冠状动脉CT血管成像检查中的可行性研究
Feasibility Study of Dual-source Coronary CT Angiography under" Double Low Scheme"
摘要
Abstract
Objective To evaluate the feasibility of low tube voltage and low concentration of contrast agent (double low)in dual - source coronary CT angiography (CTA). Methods Fifty people suspected with and diagnosed with coronary heart disease and body mass index (BMI)less than 30. 0 kg/ m2 ,who underwent coronary CTA examination in People′s Hospital of Bozhou from September 2014 to June 2015,were selected and randomly divided into group A and group B and each group had 25 cases. Group A used 100 kV tube voltage and contrast material Iodixanol of 320 mgI/ ml;and group B used 80 kV tube voltage and contrast material Iodixanol of 270 mgI/ ml. All the coronary CTA examination was performed with dual - source CT of second -generation Definition Flash of SIEMENS,scanning range was 135 mm,automatic mAs technology,contrast dose was 50 ml and the flow rate was 5. 0 ml/ s. The quality of the image was scored and objectively evaluated. The CT value and image noise of the ascending aortic root (AO)were measured,the signal to noise ratio (SNR)of the image was calculated,the contrast to noise ratio (CNR)of left main coronary artery (LM),proximal left anterior descending coronary artery (LAD)and proximal left circumflex coronary artery (LCX)and proximal right coronary artery (RCA)was measured and calculated. The effective radiation dose (ED)of the two groups was recorded. Results There was no significant difference in the score of the image quality and the total score of vascular segments between the two groups (P > 0. 05). The CT value of AO,LM,proximal LAD, proximal LCX,and proximal RCA in group B was significantly higher than that in group A (P < 0. 05). The image noise of group B was bigger than that of group A (P < 0. 05);there was no significant difference in the SNR of the images and CNR of LM,proximal LAD,proximal LCX,and proximal RCA between two groups (P > 0. 05). ED of group B was significantly lower than that of group A (P < 0. 05). Conclusion Coronary CTA under conditions of 80 kV and 270 mgI/ ml can obviously reduce the effective radiation dose and iodine intake of the patients,at the same time the quality of the image can meet the requirement of clinical diagnosis. For patients with BMI no more than 30. 0 kg/ m2 ,the dual - source coronary CTA scanning under " double low scheme " is feasibility and clinically useful.关键词
血管造影术/冠状动脉疾病/双源/体层摄影术,X线计算机/辐射剂量/碘对比剂/低浓度Key words
Angiography/Coronary artery disease/Dual - source/Tomography/X - ray computed/Radiation dosage/Iodine contrast agent/Low concentration分类
医药卫生引用本文复制引用
章辉庆,邱晓晖,刘艺超,夏俊立,刘海燕..双源CT"双低方案"在冠状动脉CT血管成像检查中的可行性研究[J].中国全科医学,2017,20(9):1127-1131,5.基金项目
亳州市科技局科技创新立项课题(By201507) （By201507）
