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Abstract #5447

Coil losses significantly alter the electromagnetic fields of a 64 MHz quadrature driven birdcage coil

Mikhail Kozlov1,2, Leonardo M Angelone3, and Wolfgang Kainz3

1MR:comp GmbH, Gelsenkirchen, Germany, 2Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, 3Division of Biomedical Physics, U.S. FDA, CDRH, Office of Science and Engineering Laboratories, Silver Spring, MD, United States

We investigated the dependence of the incident electric field (E) generated in the ASTM phantom on the coil losses. The results showed that magnetic field (H) normalized to √wbSAR, depends on capacitor Q factors. To avoid systematic errors in predicting the induced electric fields inside a human body the coil model should include realistic coil losses. Our results indicate that the use of ratio E to ||H|| at the coil iso-center normalization to predict E inside a human body located in a commercial birdcage coil based on a numerical coil model with arbitrary coil losses can result in high errors.

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