Comparison of 15 different stents in superficial femoral arteries by high resolution MRI ex vivo and in vivo
Comparison of 15 different stents in superficial femoral arteries by high resolution MRI ex vivo and in vivo
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DOI：
10.1002/jmri.20359
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发表时间：
2005-07-01
影响因子：
4.4
通讯作者：
Morrisett, JD
中科院分区：
文献类型：
--
作者：
Adams, GJ;Baltazar, U;Morrisett, JD
目的：评估 15 种不同的市售、经美国食品和药物管理局 (FDA) 批准的适合部署在股浅动脉 (SFA) 的新一代支架的 MRI 兼容性，并确定哪些支架能够通过 MRI 使支架动脉壁和管腔可视化，并具有足够的空间和对比度分辨率，以量化支架放置后的再狭窄。材料和方法：总共 13 个镍钛合金支架和两个不锈钢支架支架被放置在切除的尸体 SFA 中，并通过 1.5 T 离体 MRI 成像。定性评估图像中是否存在伪影以及支架对图像对比度的影响，并定量评估支架内动脉管腔与动脉外流体的信噪比 (SNR) 相比对信噪比 (SNR) 的影响。将镍钛诺支架放置在一名 60 岁男性的 SFA 中，并在 1.5 T 的体内成像。结果：在含有绝对镍钛诺支架的尸体 SFA 中，血管壁和管腔都可以可视化。 Dynalink 镍钛诺支架或 aSpirc 镍钛诺覆盖支架。他们的内部支架/外部支架SNR是0.7、0.8。和0.8。分别。测试的其他 10 个镍钛诺支架遮盖了管腔，但没有造成主要的图像形状伪影。所测试的两种不锈钢支架（WallGraft 和 WallStent）完全遮盖了内腔并导致图像形状显着变形。当 I Dynalink 支架插入体内高度狭窄的 SFA 时，图像显示出一个暗色膨胀的偏心管腔，由包含支架的中等强度带包围。结论：MRI 可用于在离体和体内可视化包含所选镍钛诺支架的 SFA 的管腔和 SFA。这些结果表明 MRI 可用于监测放置在股动脉床中的支架的再狭窄。
Purpose: To evaluate the MRI compatibility of 15 different commercially available, new generation, U.S. Food and Drug Administration (FDA)-approved stents suitable for deployment in superficial femoral arteries (SFAs), and to identify the ones that permit MRI to visualize the wall and lumen of stented arteries with sufficient spatial and contrast resolution to quantify restenosis after stent placement.Materials and Methods: A total of 13 nitinol stents and two stainless-steel stents were placed in excised cadaveric SFAs and imaged by MRI at 1.5 T ex vivo. The images were evaluated qualitatively for the presence of artifacts and for the effects of the stent on image contrast, and quantitatively for the effect on signal-to-noise ratio (SNR) of the lumen of the artery inside the stent compared to the SNR of the fluid outside the artery. A nitinol stent was placed in the SFA of a 60-vear-old man and imaged at 1.5 T in vivo.Results: Both the vessel wall and the lumen could be visualized in cadaveric SFAs containing either the Absolute nitinol stent. the Dynalink nitinol stent, or the aSpirc nitinol-covered stent. Their inside stent/outside stent SNR was 0.7, 0.8. and 0.8. respectively. The other 10 nitinol stents tested obscured the lumen but did not cause major image shape artifacts. Both stainless-steel stents tested, the WallGraft and WallStent, completely obscured the lumen and caused significant distortion of the image shapes. When I Dynalink stent was inserted into a highly stenosed SFA in vivo, the image showed a dark expanded eccentric lumen, circumscribed by a medium intensity band containing the stent.Conclusion: MRI can be used to visualize both the lumen and was of SFAs containing selected nitinol stents ex vivo and in, vivo. These results suggest that MRI can be used to monitor restenosis in stents placed in the femoral arterial bed.