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Safety of MRI‐guided endovascular guidewire applications
Author(s) -
Liu ChiaYing,
Farahani Keyvan,
Lu David S.K.,
Duckwiler Gary,
Oppelt Arnulf
Publication year - 2000
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/1522-2586(200007)12:1<75::aid-jmri8>3.0.co;2-#
Subject(s) - radiology , medicine , computer science , medical physics
Abstract Magnetic radiofrequency (RF) fields applied during magnetic resonance imaging (MRI) may induce heating in devices made from conductive materials. The present paper reports on theoretical and experimental studies on the RF heating resonance phenomenon of an endovascular guidewire. A nitinol‐based guidewire was inserted into a vessel phantom and imaged at 1.5 and 0.2 T with continuous temperature monitoring at the guidewire tip. The heating effects due to different experimental settings were examined. A model is developed for the resonant current and the associated electric field produced by the guidewire acting as an antenna. Temperature increases of up to 17° C were measured while imaging the guidewire at an off‐center position in the 1.5 T MR system. Power absorption produced by the resonating wire decreased as the repetition time was increased. No temperature rise was measured at 0.2 T. Considering the potential utility of low‐field, open MR systems for MRI‐guided endovascular interventions, it is important to be aware of the safety of such applications. J. Magn. Reson. Imaging 2000;12:75–78. © 2000 Wiley‐Liss, Inc.