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Nonsusceptibility artifacts due to metallic objects in MR imaging
Author(s) -
Camacho Christopher R.,
Plewes Donald B.,
Henkelman R. Mark
Publication year - 1995
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/jmri.1880050115
Subject(s) - eddy current , artifact (error) , electromagnetic coil , nuclear magnetic resonance , materials science , current (fluid) , magnetic field , radio frequency , magnetic resonance imaging , acoustics , physics , computer science , artificial intelligence , telecommunications , radiology , quantum mechanics , thermodynamics , medicine
Abstract The authors investigated eddy current artifacts due to metallic objects within the magnetic resonance imaging field. The problem was simplified by using a circular copper loop as a model for the more complex eddy current pathways present in a metallic implant. With this simple geometry, the authors show that radio‐frequency (RF)‐induced eddy currents in the metal produce a significant local artifact. However, no appreciable artifacts due to the switching magnetic field gradients were observed. A detailed quantitative analysis of the mechanism of RF‐induced eddy current artifact due to the the copper loop was performed. The artifact was demonstrated experimentally to result from perturbations of the transmit and receive sensitivities of the RF coil. Theoretical calculations of these perturbations showed excellent agreement with experimental results. With an understanding of the artifact mechanism, methods for correcting the RF‐induced eddy current artifact were applied.