Burg Matthias C, Bunck Alexander C, Seifarth Harald, Buerke Boris, Kugel Harald, Hesselmann Volker, Köhler Michael, Heindel Walter, Maintz David
Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Str. 33, 48149 Münster, Germany.
Radiol Res Pract. 2011;2011:478175. doi: 10.1155/2011/478175. Epub 2010 Jul 27.
Purpose. To evaluate stent lumen visibility of a large sample of different peripheral arterial (iliac, renal, carotid) stents using magnetic resonance angiography in vitro. Materials and Methods. 21 different stents and one stentgraft (10 nitinol, 7 316L, 2 tantalum, 1 cobalt superalloy, 1 PET + cobalt superalloy, and 1 platinum alloy) were examined in a vessel phantom (vessel diameters ranging from 5 to 13 mm) filled with a solution of Gd-DTPA. Stents were imaged at 1.5 Tesla using a T1-weighted 3D spoiled gradient-echo sequence. Image analysis was performed measuring three categories: Signal intensity in the stent lumen, lumen visibility of the stented lumen, and homogeneity of the stented lumen. The results were classified using a 3-point scale (good, intermediate, and poor results). Results. 7 stents showed good MR lumen visibility (4x nitinol, 2x tantalum, and 1x cobalt superalloy). 9 stents showed intermediate results (5x nitinol, 2x 316L, 1x PET + cobalt superalloy, and 1x platinum alloy) and 6 stents showed poor results (1x nitinol, and 5x 316L). Conclusion. Stent lumen visibility varies depending on the stent material and type. Some products show good lumen visibility which may allow the detection of stenoses inside the lumen, while other products cause artifacts which prevent reliable evaluation of the stent lumen with this technique.
目的。在体外使用磁共振血管造影术评估大量不同外周动脉（髂动脉、肾动脉、颈动脉）支架的支架管腔可视性。材料与方法。在充满钆喷酸葡胺溶液的血管模型（血管直径范围为5至13毫米）中检查21种不同的支架和1种支架移植物（10种镍钛合金、7种316L不锈钢、2种钽、1种钴基高温合金、1种聚对苯二甲酸乙二酯 + 钴基高温合金以及1种铂合金）。使用T1加权三维扰相梯度回波序列在1.5特斯拉场强下对支架进行成像。进行图像分析时测量三类指标：支架管腔内的信号强度、支架管腔的可视性以及支架管腔的均匀性。结果采用三分制进行分类（良好、中等和差）。结果。7种支架显示出良好的磁共振管腔可视性（4种镍钛合金、2种钽和1种钴基高温合金）。9种支架显示出中等结果（5种镍钛合金、2种316L不锈钢、1种聚对苯二甲酸乙二酯 + 钴基高温合金和1种铂合金），6种支架显示出较差结果（1种镍钛合金和5种316L不锈钢）。结论。支架管腔可视性因支架材料和类型而异。一些产品显示出良好的管腔可视性，这可能有助于检测管腔内的狭窄，而其他产品会产生伪影，妨碍使用该技术对支架管腔进行可靠评估。
