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Abstract #2797

Optimization of 3D EPI Technique for Radio Frequency (B1) Field Mapping at 3T

Antoine Lutti1, Chloe Hutton1, Nikolaus Weiskopf1

1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, UK

Spatial inhomogeneities in the radio-frequency field (B1) pose various problems such as spurious signal and contrast changes in MRI, leading to bias in quantitative imaging and difficulties in tissue segmentation. We optimize a 3D EPI B1 mapping method using carefully chosen RF pulses and a post-processing procedure that corrects biased flip angles and image distortions along the phase direction. We obtain reliable flip angle maps at 3T over the entire brain volume with a sufficient resolution and in an achievable experimental time.