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Abstract #4276

Investigation of pTx pulses for magnetisation inversion on 7T Terra

Belinda Ding1, Christopher Wickens1, Iulius Dragonu2, Catarina Rua1, Saba Shirvani1, Patrick Liebig3, Robin Heidemann3, Guy B Williams1, and Christopher T Rodgers1
1Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, United Kingdom, 2Siemens Healthcare Limited, Firmley, United Kingdom, 3Siemens Healthcare Limited, Erlangen, Germany

We compare performance of two approaches for magnetisation inversion on a Siemens 7T Terra scanner, with 8Tx32Rx Nova head coil. We compared 3D non-selective pTx pulses designed in the scanner’s online pulse design tool, against traditional adiabatic pulses in both phantoms and the brain of a volunteer. We observe that spiral pTx pulses have substantially lower SAR burden than adiabatic hyperbolic secant pulses, but using the default parameter sets, the spiral inversion is less homogeneous. Thus, spiral pTx pulses are advantageous in SAR limited sequences, and further optimisation is likely to improve the inversion efficiency of these pulses.

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