Heinrich Andreas, Güttler Felix V, Schlesies Florian, Aschenbach René, Eckardt Niklas, Teichgräber Ulf K-M
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Biomed Tech (Berl). 2017 Nov 27;62(6):565-573. doi: 10.1515/bmt-2016-0008.
The purpose of this study was to measure artifacts and visibility of lumen for modern and most commonly used stents in vascular interventions according to a standardized test method of the American Society for Testing and Materials (ASTM).
Twenty-four peripheral self-expanding nitinol stents and three stainless steel stents with diameters between 5 and 8 mm and lengths between 30 and 250 mm from seven different manufacturers were compared on a 1.5T and a 3T magnetic resonance (MR) scanner. The visualization of lumen and artifacts was measured according to ASTM F2119 for a turbo spin echo (TSE) [repetition time(TR)/echo time (TE) 500/26 ms] and a gradient echo (GRE) (TR/TE 100/15 ms) sequence. The stents were placed parallel and perpendicular to the radio frequency field (B1).
There were large differences in visibility of the lumen for the stent models. The visualization of the lumen varies between 0% and 93% (perpendicular to B1), and 0% and 78% (parallel to B1), respectively. The maximum signal loss beyond the actual diameter was 6 mm (TSE) and 10 mm (GRE) for stents made of stainless steel, and lower than 1 mm (TSE) and 4 mm (GRE) for nitinol stents.
Reliable stent lumen visualization is possible for Misago, Supera, Tigris, and Viabahn stents, if their axis is perpendicular to B1, and independent of the orientation with respect to B1 for short Tigris stents at 1.5T.
本研究的目的是根据美国材料与试验协会（ASTM）的标准化测试方法，测量血管介入中现代且最常用支架的伪影和管腔可视性。
在1.5T和3T磁共振（MR）扫描仪上，对来自七个不同制造商的24个外周自膨式镍钛合金支架和3个直径在5至8mm之间、长度在30至250mm之间的不锈钢支架进行了比较。根据ASTM F2119，针对涡轮自旋回波（TSE）[重复时间（TR）/回波时间（TE）500/26ms]和梯度回波（GRE）（TR/TE 100/15ms）序列测量管腔和伪影的可视化情况。支架平行和垂直于射频场（B1）放置。
支架模型的管腔可视性存在很大差异。管腔的可视化分别在0%至93%（垂直于B1）和0%至78%（平行于B1）之间变化。不锈钢支架超出实际直径的最大信号损失为6mm（TSE）和10mm（GRE），镍钛合金支架则低于1mm（TSE）和4mm（GRE）。
对于Misago、Supera、Tigris和Viabahn支架，如果其轴线垂直于B1，则可以实现可靠的支架管腔可视化，对于1.5T的短Tigris支架，其可视化与相对于B1的方向无关。
