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Assessing the MR compatibility of dental retainer wires at 7 Tesla
Author(s) -
Wezel Joep,
Kooij Bert Jan,
Webb Andrew G.
Publication year - 2014
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.25019
Subject(s) - retainer , materials science , specific absorption rate , ferromagnetism , image quality , biomedical engineering , nuclear magnetic resonance , composite material , computer science , medicine , physics , condensed matter physics , image (mathematics) , telecommunications , artificial intelligence , antenna (radio)
Purpose To determine the MR compatibility of common dental retainer wires at 7 Tesla in terms of potential RF heating and magnetic susceptibility effects. Methods Electromagnetic simulations and experimental results were compared for dental retainer wires placed in tissue‐mimicking phantoms. Simulations were then performed for a human model with wire in place. Finally, image quality was assessed for different scanning protocols and wires. Results Simulations and experimental data in phantoms agreed well, with the length of the wire correlating to maximum heating in phantoms being approximately 47 mm. Even in this case, no substantial heating occurs when scanning within the specific absorption rate (SAR) guidelines for the head. Image distortions from the most ferromagnetic dental wire were not significant for any brain region. Conclusion Dental retainer wires appear to be MR compatible at 7 Tesla. Magn Reson Med 72:1191–1198, 2014. © 2013 Wiley Periodicals, Inc.