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Published in:
2012 | OriginalPaper | Chapter
Safety Limits for Human-Size Magnetic Particle Imaging Systems
Authors : Emine U. Saritas, Patrick W. Goodwill, George Z. Zhang, Wenxiao Yu, Steven M. Conolly
Published in: Magnetic Particle Imaging
Publisher: Springer Berlin Heidelberg
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Current small-animal-sized MPI scanners operate at 1-25 kHz frequency range with 0.1-20 mT peak amplitude, neither of which is optimized. SAR and especially dB/dt safety limits will determine the optimum excitation field, and will impact the optimum scanning speed, field-of-view (FOV) and signal-to-noise ratio (SNR). In this work, we describe the first human-subject safety limit experiments for MPI. Our results indicate that the magnetostimulation threshold monotonically decreases with increasing frequency and is inversely correlated to the body-part size.