Mahnken Andreas H, Buecker Arno, Wildberger Joachim E, Ruebben Alexander, Stanzel Sven, Vogt Felix, Günther Rolf W, Blindt Rüdiger
Department of Diagnostic Radiology, University of Technology, Aachen, Germany.
Invest Radiol. 2004 Jan;39(1):27-33. doi: 10.1097/01.rli.0000095471.91575.18.
The 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).
Ten 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.
Depending 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.
Independent of the scanner hardware or dedicated convolution kernels, routine evaluation of most coronary artery stents is not yet feasible using MSCT.
本研究的目的是系统比较多层螺旋CT（MSCT）在存在冠状动脉支架的情况下评估冠状动脉管腔的能力。
使用4排和16排探测器的MSCT扫描仪对10种不同的冠状动脉支架进行检查。图像重建时，使用了用于冠状动脉支架可视化的标准卷积核和专用卷积核。分析图像的管腔可见性、腔内衰减以及支架管腔外的伪影。使用重复测量方差分析比较结果。
根据支架类型、扫描仪硬件和卷积核的不同，人为造成的管腔狭窄范围为20%至100%。卷积核对支架管腔的可见性影响最为显著。使用专用卷积核时，人为造成的管腔狭窄和腔内衰减变化显著减少。一般来说，最严重的伪影是由金色或镀金支架引起的。
无论扫描仪硬件或专用卷积核如何，使用MSCT对大多数冠状动脉支架进行常规评估目前尚不可行。
