双能CT单能谱应用对冠脉小内径支架显示的影响

发布时间：2018-08-12 17:09

【摘要】：目的:评价双能CT单能谱技术不同能级对3 mm及以下冠脉支架显示的影响。方法:选取不同材质7枚内径3 mm或2.5 mm支架,模拟冠脉血管模型,行双源CT双能量冠脉扫描,将获得的两种不同能量(100及140 k V)数据采用单能谱技术重建处理,分别得到60~140 ke V(间隔10 keV)及线性融合120 kV 10组图像;对上述10组图像进行双盲主观评价以及包括支架内径差异、支架内腔衰减和图像噪声的客观评价,统计分析各组间差异性。结果:图像质量主观评分一致性良好(Kappa=0.833),80 keV组获得的图像质量总评分最高,为31分,除与90 ke V组及120 k V组差异未达到统计学意义外(P均0.05),与其他各组间均有显著统计学差异(P值均0.05);80 keV组支架内径差异值最低,为36.1%±3.7%,明显低于其他各能级组,差异均有统计学意义(P值0.05);各组间支架管腔内衰减差异未达统计学差异(P=0.151)。80 keV组噪声最低,为(12.51±1.27)HU,与其各组间均有统计学差异(P值0.05)。结论:对于3 mm及以下支架的评估,80 keV能级图像重组获得的图像质量最佳,更符合临床工作需求,值得推荐使用。
[Abstract]:Objective: to evaluate the effects of different energy levels of dual energy CT single energy spectroscopy on the display of coronary stents under 3 mm and below. Methods: seven stents with 3 mm or 2.5 mm inner diameter of different materials were selected to simulate the coronary artery model. The two different energy sources (100 and 140 k V) were reconstructed by single energy spectrum technique. 10 groups of images with 60 ke V (interval of 10 keV) and 10 groups of linear fusion images were obtained, and the subjective evaluation of double-blind and objective evaluation including the difference of stent diameter, the attenuation of stent cavity and the image noise were carried out, and the differences among the 10 groups were statistically analyzed. Results: the total score of image quality was the highest in the group of 80 keV with good consistency of image quality (Kappa=0.833), with a score of 31. Except that there was no significant difference between 90keV group and 120kV group (P 0.05), there was significant difference (P 0. 05) between the other groups and other groups (P 0. 05). The difference of stent diameter in the 80 keV group was the lowest (36. 1% 卤3. 7%), which was significantly lower than that in other energy level groups. The difference was statistically significant (P0. 05), and the difference in the attenuation of stent lumen was not up to statistical difference (P0. 151). 80 keV group had the lowest noise (12. 51 卤1. 27) HUU, and there was statistical difference between each group (P 0. 05). Conclusion: the reconstruction of 80 keV energy level images with 3 mm or less scaffolds has the best image quality, which is more suitable for clinical work and is worthy of recommended use.
【作者单位】：中国医科大学附属第一医院放射科;西门子医疗CT事业部;
【分类号】：R816.2;R541.4

【共引文献】