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80kVp、低浓度对比剂冠状动脉CTA检查的初步研究 预览 被引量:16

Preliminary study on coronary CT angiography using 80kVP and 300mg I/mL iodixanol
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摘要 目的:探讨64排螺旋CT采用ASIR技术、80kVp管电压及低浓度碘海醇(300mgI/mL)行冠状动脉CTA检查的可行性。方法:搜集在我院行冠状动脉CTA检查、BMI20~25kg/m^2的25例患者。扫描方案采用前门控扫描技术,管电压80kVp,对比剂为碘海醇(300mgI/mL,用量60mL),自动毫安,30%ASIR技术重建。将冠状动脉分为16个节段,分别对每例患者冠状动脉各节段的CT值进行测量,对图像质量进行评分,并记录每例患者接受的辐射剂量,对测量结果进行统计学分析。结果:冠状动脉各节段CT值均可达到临床诊断要求。冠状动脉各节段图像质量评分均为3分及以上。辐射剂量远低于常规后门控扫描技术(管电压120kVP,对比剂碘帕醇浓度370mgI/mL)。结论:64排螺旋CT80kVp条件下采用300mgI/mL碘海醇行冠状动脉CTA检查可获得较好的图像质量,能够满足临床诊断需要,同时大幅度降低患者所受辐射剂量。 Objective: To evaluate the feasibility of 80kVp and 300mg I/mL iodixanol in coronary CT angiography (CTA) with 64-slice spiral CT scanner using ASIR reconstruction. Methods:Totally 25 patients undergoing coronary CTA, whose BMI was 20425 ,in July, 2012 ,were included. These patients underwent CTA with prospective ECG-gated CT protocols using following parameters:80kV,iodixanol 300rag I/mL, volume 60mL, automatic mA and 30% ASIR. The coronary artery was divided into 16 segments. Segmental vascular CT value,image quality and the radiation dose values were evaluated by descriptive index. Results: Each segmental vascular CT value could meet clinical diagnostic needs. Also,image quality scores of each segment is greater or equal to three. The subjective assessment of image quality was pretty good. Meanwhile, the radiation dose of double low group was significantly lower than that of normal group with retrospective ECC-gated CT protocols (120 kV, iopromide 370mg I/mL). Conclusion: Using 64-slice spiral CT scanner and ASIR reconstruction, high quality images can be acquired by 80kVp and 300 mg I/mL iodixanol, which can meet clinical diagnostic needs.
作者 王蕊 张保翠 王霄英 罗健 王鹤 WANG Rui, ZHANG Bao-cui, WANG Xiao-ying, et al.( Department of Radiology, Peking University First Hospital, Beijing 100034, P. R. China)
出处 《放射学实践》 2013年第5期501-504,共4页 Radiologic Practice
关键词 体层摄影术 X线计算机 辐射剂量 图像处理 计算机辅助 Tomography, X-ray computed Radiation dose Image processing, computer assisted
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