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Abstract #2301

Validation of SAR Management Procedure for Dynamic pTx RF Waveforms Using a Self-Built Coil at 7 Tesla

Sydney Nicole Williams1, Sarah Allwood-Spiers2, Paul McElhinney1, Yuehui Tao3, John E. Foster2, Shajan Gunamony1,4, and David A. Porter1
1Imaging Centre of Excellence, University of Glasgow, Glasgow, United Kingdom, 2MRI Physics, NHS Greater Glasgow & Clyde, Glasgow, United Kingdom, 3Siemens Healthcare Ltd., Glasgow, United Kingdom, 4MR CoilTech Limited, Glasgow, United Kingdom

Parallel transmit (pTx) can reduce B1+ field inhomogeneity present at 7T, but needs additional consideration for specific absorption rate (SAR) monitoring due to the superimposed electromagnetic fields. For self-built pTx coils, validation includes comparing electromagnetic field simulations with experimental B1+ maps and thermometry, previously presented for static pTx in a self-built 8Tx/32Rx coil. We present full-waveform pTx validation with two further tests: comparison of measured and prescribed RF waveforms, and calculation of local SAR with virtual observation points (VOPs) for all pTx pulses with comparison to scanner predictions and measurements. After validation, dynamic pTx is performed in vivo.

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