Lövblad Karl-Olof, Yilmaz Hasan, Chouiter Amine, San Millan Ruiz Diego, Abdo German, Bijlenga Philippe, de Tribolet Nicolas, Ruefenacht Daniel A
Division of Neuroradiology, Radiology Department, Geneva University Hospital, Switzerland.
J Magn Reson Imaging. 2006 Aug;24(2):418-22. doi: 10.1002/jmri.20642.
Intracranial stenting is increasingly being used to treat intracranial aneurysms and stenoses. We wanted to assess the utility of magnetic resonance angiography (MRA) in the follow-up of patients treated with various types of intracranial stents and to assess the utility of performing gadolinium-enhanced MRA. A total of 19 patients having undergone intracranial stenting for aneurysms were imaged by MRI at 1.5T. A total of 20 stents were placed in 19 patients. In addition to conventional T2- and diffusion-weighted MRI, 3D time-of-flight MRA was performed before and after contrast administration. In the case of metallic INX stents (N = 7), there was a signal drop at the level of the vessel. which did not allow to evaluating the parent vessel, whereas this was visible in Nitinol stents (N = 8). Additionally a stent with a wire had a small artifact (N = 3). Contrast administration also improved vessel lumen visualization. In the case of Nitinol stents, MRA can be used to reliably demonstrate the vessel lumen after intracranial stenting. The use of postcontrast 3D time-of-flight imaging helps improve the intraluminal definition.
颅内支架置入术越来越多地用于治疗颅内动脉瘤和狭窄。我们旨在评估磁共振血管造影（MRA）在各类颅内支架治疗患者随访中的效用，并评估钆增强MRA的效用。共有19例接受颅内动脉瘤支架置入术的患者在1.5T条件下接受了MRI检查。19例患者共置入20枚支架。除常规T2加权和弥散加权MRI外，在注射造影剂前后均进行了三维时间飞跃MRA检查。对于金属INX支架（n = 7），血管水平出现信号下降，无法评估母血管，而在镍钛合金支架（n = 8）中则可见母血管。此外，带金属丝的支架有小伪影（n = 3）。注射造影剂也改善了血管腔的可视化。对于镍钛合金支架，MRA可用于可靠地显示颅内支架置入术后的血管腔。使用造影剂后的三维时间飞跃成像有助于改善腔内清晰度。
