Coronary Artery Stents in Multislice Computed Tomography: In Vitro Artifact Evaluation
Coronary Artery Stents in Multislice Computed Tomography: In Vitro Artifact Evaluation
复制标题
多层计算机断层扫描中的冠状动脉支架：体外人工制品评估
作者：
A. Mahnken;A. Buecker;J. Wildberger;A. Ruebben;S. Stanzel;F. Vogt;R. Günther;R. Blindt
原理和目的本研究的目的是系统地比较多层螺旋CT （MSCT）在冠状动脉支架存在时评估冠状动脉管腔的能力。方法采用4排和16排MSCT检查不同冠状动脉支架。在图像重建方面，采用标准的和专用的冠状动脉支架可视化卷积核。分析有关管腔可见性、腔内衰减和支架管腔外伪影的图像。结果采用重复测量方差分析进行比较。结果根据支架类型、扫描仪硬件和卷积核的不同，人工管腔狭窄的范围在20%到100%之间。卷积核对支架内腔可见性的影响最为显著。使用专用卷积核后，人工管腔变窄和腔内衰减变化明显减少。一般来说，大多数严重的假物是由金或镀金支架引起的。结论独立于扫描仪硬件或专用卷积核，大多数冠状动脉支架的常规评估尚不可行的MSCT。
Rationale and ObjectiveThe aim of this study was to systematically compare the ability to assess the coronary artery lumen in the presence of coronary artery stents in multislice spiral CT (MSCT). MethodsTen different coronary artery stents were examined with 4- and 16-detector row MSCT scanners. For image reconstruction, a standard and a dedicated convolution kernel for coronary artery stent visualization were used. Images were analyzed regarding lumen visibility, intraluminal attenuation, and artifacts outside the stent lumen. Results were compared using repeated-measure analysis of variance. ResultsDepending on stent type, scanner hardware, and convolution kernel, artificial lumen narrowing ranged from 20% to 100%. The convolution kernel had the most significant influence on the visibility of the stent lumen. Artificial lumen narrowing and intraluminal attenuation changes decreased significantly using the dedicated convolution kernel. In general, most severe artifacts were caused by gold or gold-coated stents. ConclusionsIndependent of the scanner hardware or dedicated convolution kernels, routine evaluation of most coronary artery stents is not yet feasible using MSCT.