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
INM - 4, Research Centre Jlich GmbH,
Center for Neurodegenerative Diseases (DZNE), Bonn,
of Neurology, RWTH Aachen University, Aachen, Germany
Four different encoding methods for B
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
at ultra high field.
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