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On the Contribution of Electric-Type Current Patterns to UISNR for a Spherical Geometry at 9.4 T

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Pfrommer,  A
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Henning,  A
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Pfrommer, A., & Henning, A. (2015). On the Contribution of Electric-Type Current Patterns to UISNR for a Spherical Geometry at 9.4 T. In 23rd Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2015).


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-45CF-3
Abstract
Parallel imaging is intrinsically limited by Maxwell’s equations. A complete set of vector solutions to the Helmholtz equation consists of both curl-free and divergence-free fields. In this study we investigated the contribution of electric-type current patterns to UISNR for different voxel positions and acceleration factors in a spherical model at 9.4T. For moderate acceleration the electric mode increased UISNR by maximally 55. For very high acceleration, however, UISNR was mostly caused by the magnetic mode. The reason for this might be the much faster growing power loss of the electric mode with respect to the expansion order.