中国医学科学院学报2017，Vol.39Issue(1)：62-67,6.DOI:10.3881/j.issn.1000-503X.2017.01.011
自动管电压选择技术在第3代双源CT大螺距主动脉CT血管成像扫描中的初步应用
Initial Experience of the Application of Automated Tube Potential Selection Technique in High-pitch Dual-source CT Angiography of Whole Aorta Using Third-generation Dual-source CT Scanner
摘要
Abstract
Objective To evaluate the application of automated tube potential selection technique in high-pitch dual-source CT aortic angiography on a third-generation dual-source CT scanner.Methods Whole aorta angiography were indiated in 59 patients, who were divided into 2 groups using a simple random method:in group 1 there were 31 patients who underwent the examination with automated tube potential selection using a vascular setting with a preferred image quality of 288 mA/100 kV;in group 2 there were 28 patients who underwent the examination with a tube voltage of 100 kV and automated tube current modulation using a reference tube current of 288 mA.Both groups were scanned on a third generation dual-source CT device operated in dual-source high-pitch ECG-gating mode with a pitch of 3.0, collimation of 2 × 192 ×0.6 mm, and a rotation time of 0.25 s Iterative reconstruction algorithm was used.For group 1, the volume and flow of contrast medium and chasing saline were adapted to the tube voltage.For group 2, a contrast material bolus of 45 ml with a flow of 4.5 ml/s followed by a 50 ml saline chaser at 5 ml/s was used.CTA scan was automatically started using a bolus tracking technique at the level of the original part of aorta after a trigger threshold of 100 HU was reached.The start delay was set to 6 s in both groups.Effective dose (ED), signal to noise ratio (SNR), contrast to noise ratio (CNR), and subjective diagnostic quality of both groups were evaluated.Results The mean ED were 21.3％ lower (t=-3.099, P=0.000) in groupl [(2.48±0.80) mSv] than in group2 [(3.15±0.86) mSv].Two groups showed no significant difference in attenuation, SD, SNR, or CNR at all evaluational parts of aorta (ascending aorta, aortic arch, diaphragmatic aorta, or iliac bifurcation) (all P ＞0.05).There was no significant difference in subjective diagnostic quality values of two groups [(1.41 ±0.50) scores vs.(1.39 ±0.50)scores;W =828.5, P =0.837].Conclusion Compared with automated tube current modulation, the automated tube potential selection technique in aorta CT angiography on a third-generation dual-source CT can dramatically reduce radiation dose without affecting image quality.关键词
主动脉/CT血管成像/大螺距/辐射剂量/图像质量Key words
aorta/CT angiography/high-pitch/radiation dose/image quality分类
医药卫生引用本文复制引用
孔令燕,梁继祥,薛华丹,王怡宁,王沄,金征宇,张大明,陈瑾..自动管电压选择技术在第3代双源CT大螺距主动脉CT血管成像扫描中的初步应用[J].中国医学科学院学报,2017,39(1):62-67,6.基金项目
国家临床重点专科建设项目(2014)和卫生公益性行业科研专项项目(201402001、 201402019) Supported by the National Key Clinical Specialist Construction Programs of China (2014) and the Health Industry Special Scientific Research Project (201402001,201402019) （2014）
