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Abstract #2294

Quantification of safety and image quality in low field MRI in the presence of medical implants.

Camille D.E. Van Speybroeck1, Wouter M. Teeuwisse1, Tom O'Reilly1, Paul M. Arnold2, and Andrew G. Webb1
1G.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands, 2Neurosurgery, Carle Foundation Hospital, Urbana, IL, United States

Very little quantitative data exist on safety aspects of medical implants in low field MRI systems. Protocols for clinical scanners must be adjusted due to differences in bore size and B0 direction. We present measured and simulated data on magnetically induced displacement forces, image artifacts and SAR on a 50 mT portable MRI system. Results show that some implants must be considered MR unsafe even at 50 mT, that image artifacts are less compared to 3 T even with much lower gradient strengths, and SAR limits can be breached if using very short pulses and inter-echo times in TSE sequences.

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