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 kV）数据采用单能谱技术重建处理，分别得到60～140 keV（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 keV组及120 kV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 improvement for 3 mm or less coronary artery stent visualization by using monoenergetic imaging of dual-energy CT. Methods: We selected seven 3 mm or 2.5 mm coronary artery stents of different materials to make in-vitro coronary artery model, and then underwent perspective coronary artery scan using dual-energy CT, then reconstruct the two different data(100 and 140 kV) using dual-energy scanning sequence with monoenergetic technique, monoenergetic software was used to post-process with the flowing 9 photon energies: 60～140 keV(interval 10 keV) and average weighted 120 kV images with different data at 100 and 140 simulation of coronary vascular model. Double-blind and independent qualitative evaluation and quantitative assessment including artificial lumen narrowing(ALN), luminal attenuation difference and image noise in the groups were performed, and analysis the differences between the groups. Results: The interobserver agreement for the image subjective quality scores was substantial(Kappa=0.833), the image quality of the 80 keV group was the highest total score, for 31 points, in addition to the difference with 90 keV group and 120 kV group did not reach statistical significance(P>0.05), there was statistically significant difference with the other groups(P<0.05). The ALN value of the 80 keV group was the lowest (36.1%±3.7%), which was much lower than the other groups, and the difference with other groups was statistically significant(P<0.05). But the value of the stent luminal attenuation difference between the ten groups all did not reach statistical significance(P=0.151). The noise value of the 80 keV group was the lowest((12.51±1.27) HU), and the difference with other groups was statistically significant(P<0.05). Conclusion: To visually evaluate 3 mm or less coronary artery stents, the best image quality is to using the 80 keV energy level, more conform to the requirements of clinical work, recommended to use.
关键词
支架 /
冠状血管 /
体层摄影术 /
X线计算机
Key words
Stents /
Coronary vessels /
Tomography /
X-ray computed
王彦懿;初金刚;于 扬;赵 宇;戴 旭.
双能CT单能谱应用对冠脉小内径支架显示的影响[J]. 中国临床医学影像杂志. 2015, 26(6): 400-404
WANG Yan-yi;CHU Jin-gang;YU Yang;ZHAO Yu;DAI Xu.
Visual improvement for 3 mm or less coronary artery stent imaging by using monoenergetic imaging of dual-energy CT[J]. Journal of China Clinic Medical Imaging. 2015, 26(6): 400-404
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