The electromagnetic fields of a 64 MHz quadrature driven birdcage coil in ASTM 
phantom

Kozlov, Mikhail; Angelone, L. M.; Kainz, W.

doi:10.23919/EuMC.2017.8230947

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The electromagnetic fields of a 64 MHz quadrature driven birdcage coil in ASTM phantom

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Kozlov, Mikhail
Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Citation

Kozlov, M., Angelone, L. M., & Kainz, W. (2017). The electromagnetic fields of a 64 MHz quadrature driven birdcage coil in ASTM phantom. In 47th European Microwave Conference (EuMC). doi:10.23919/EuMC.2017.8230947.

Cite as: https://hdl.handle.net/21.11116/0000-0001-1C7D-5

Abstract

This study investigates the effect of the tuning conditions and losses of a radiofrequency birdcage coil on the incident field generated in a phantom. Several numerical implementations of a birdcage body coil model with variable coil losses were studied. The results showed that magnetic field at the coil isocenter (||H||iso), normalized to the square root of the whole body specific absorption rate, depends linearly on the coil quality factor. The latter depends non-linear on the birdcage tuning conditions and coil losses. Additionally, when realistic tuning and losses are neglected, results suggest that systematic errors of up to 35% could occur in calculated induced electric fields inside ASTM phantom.