Jin Jin1, Feng Liu1, Ewald Weber1, Stuart Crozier1
1The School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Queensland, Australia
The substantial challenges for high-field magnetic resonance imaging are the control of transmit magnetic field (B1+) homogeneity and the specific absorption rate (SAR), so that the potential for higher signal-to-noise ratio (SNR) at high fields can be realised. To address these challenges, we demonstrate the use of the inverse field-based approach for simultaneous mapping of the magnetic and the concomitant electric field distributions within the imaged subject. Using a simple yet effective RF shimming algorithm, dubbed SNR shimming, the complete knowledge of the electromagnetic field distribution enables us to more effectively regulate B1-inhomogeneity, maximum local SAR and local SNR.
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