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AJNR - American Journal of Neuroradiology

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MR Safety and Imaging of Neuroform Stents at 3T

Arvind Nehra^a, Christopher J. Moran^a,b, DeWitte T. Cross, III^a,b and Colin P. Derdeyn^a,b,c

^a Interventional Neuroradiology Service, Mallinckrodt Institute of Radiology
^b Department of Neurological Surgery, Washington University School of Medicine, St. Louis, MO
^c Department of Neurology, Washington University School of Medicine, St. Louis, MO

View larger version (15K): [in a new window]   FIG 1. Slight increase in temperature for stent aneurysm model and control during prolonged (21 minutes), maximal SAR (radio-frequency energy of 3.2 W/kg) imaging sequence. A similar temperature increase of less than 0.2°C can be seen in the stented artery (solid black circles) and control saline (open black circles).

View larger version (39K): [in a new window]   FIG 2. Images of a stented and coiled arterial segment suspended in a saline and gadolinium solution within a 10-mL syringe. A spin-echo T1-weighted image (A) shows the syringe with stented vessel (white arrow) and adjacent coil mass (white arrowhead). The gradient echo image (B) shows signal intensity loss from susceptibility effects of the coil mass (blooming, white arrow), but no visible effects from the stent. Field mapping (C) shows no apparent field distortion related to the stent or the coil mass. The concentric lines represent magnetic field-strength lines with a difference of 50 Hz between lines.