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Abstract #4336

Encoding Methods for B 1 + Mapping in Parallel Transmission Systems at Ultra High Field

Desmond H. Y. Tse 1 , Michael S. Poole 1 , Arthur W. Magill 1 , Jrg Felder 1 , Daniel Brenner 1,2 , and N. Jon Shah 1,3

1 INM - 4, Research Centre Jlich GmbH, Jlich, Germany, 2 German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany, 3 Department of Neurology, RWTH Aachen University, Aachen, Germany

Four different encoding methods for B 1 + mapping in parallel transmission system, namely 1-channel-on, all-channels-on-except-1, all-channels-on-1-inverted and RF phase encoding (PE), were evaluated using dual refocusing acquisition mode (DREAM) at 9.4 T. RF PE, which encodes each transmit channel by phase rotation, was the least susceptible to artefacts caused by destructive RF interference. It showed negligible dependency on the initial RF phase setting and provides a flexible way to increase the number of measurements to increase SNR and reduce artefacts by weighted decoding. These advantages of RF PE make it a good choice for B 1 + mapping at ultra high field.

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