@article {Irie, author = {R. Irie and M. Suzuki and M. Yamamoto and N. Takano and Y. Suga and M. Hori and K. Kamagata and M. Takayama and M. Yoshida and S. Sato and N. Hamasaki and H. Oishi and S. Aoki}, title = {Assessing Blood Flow in an Intracranial Stent: A Feasibility Study of MR Angiography Using a Silent Scan after Stent-Assisted Coil Embolization for Anterior Circulation Aneurysms}, year = {2014}, doi = {10.3174/ajnr.A4199}, publisher = {American Journal of Neuroradiology}, abstract = {BACKGROUND AND PURPOSE: Blood flow in an intracranial stent cannot be visualized with 3D time-of-flight MR angiography owing to magnetic susceptibility and radiofrequency shielding. As a novel follow-up tool after stent-assisted coil embolization, we applied MRA by using a Silent Scan algorithm that contains an ultrashort TE combined with an arterial spin-labeling technique (Silent MRA). The purpose of this study was to determine whether Silent MRA could visualize flow in an intracranial stent placed in the anterior circulation. MATERIALS AND METHODS: Nine patients treated with stent-assisted coil embolization for anterior circulation aneurysms underwent MRAs (Silent MRA and TOF MRA) and x-ray digital subtraction angiography. MRAs were performed in the same session on a 3T unit. Two neuroradiologists independently reviewed the MRA images and subjectively scored flow in a stent as 1 (not visible) to 4 (excellent) by referring to the latest x-ray digital subtraction angiography image as a criterion standard. RESULTS: Both observers gave Silent MRA higher scores than TOF MRA for flow in a stent in all cases. The mean score for Silent MRA was 3.44 {\textpm} 0.53, and for TOF MRA, it was 1.44 {\textpm} 0.46 (P \< .001). CONCLUSIONS: Silent MRA was able to visualize flow in an intracranial stent more effectively than TOF MRA. Silent MRA might be useful for follow-up imaging after stent-assisted coil embolization, though these study results may be only preliminary due to some limitations.}, issn = {0195-6108}, URL = {https://www.ajnr.org/content/early/2014/12/26/ajnr.A4199}, eprint = {https://www.ajnr.org/content/early/2014/12/26/ajnr.A4199.full.pdf}, journal = {American Journal of Neuroradiology} }