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Asymmetric Transceiver Phased Array for Functional Imaging and Spectroscopy of the Visual Cortex at 9.4 T

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Avdievich,  NI
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons192635

Giapitzakis,  IA
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons84402

Henning,  A
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Avdievich, N., Giapitzakis, I., & Henning, A. (2015). Asymmetric Transceiver Phased Array for Functional Imaging and Spectroscopy of the Visual Cortex at 9.4 T. Poster presented at 23rd Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2015), Toronto, Canada.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-461A-4
Abstract
Ultra-high field (>7T) RF coil design is challenging due to decreased transmit efficiency and strongly distorted B1 field profile. For functional SI of the visual cortex open RF coils are highly suitable since they provide an easy access and increased transmit efficiency by focusing RF field. In this work we demonstrated that a 9.4T 5-channel array with asymmetric arrangement of 4 transmit and 4 receive elements improves the transmit profile without compromising the reception. We also evaluated changes in the transmit efficiency, penetration depth and SAR due to variation in the array size and the phase shift between the elements.