Abstract #2867

Calibration of saturation prepared turbo FLASH B1+ maps by actual flip angle imaging at 7T.

Jan Sedlacik^1,2,3,4, Raphael Tomi-Tricot^1,2,3,5, Tom Wilkinson^1,2,3, Pip Bridgen^1,2,3, Franck Mauconduit⁶, Alexis Amadon⁶, Sharon Giles^1,2,3, Joseph V Hajnal^1,2,3, and Shaihan J Malik^1,2,3

¹Centre for the Developing Brain, School of Biomedical Engineering & Imaging Sciences, King’s College London, London, United Kingdom, ²Biomedical Engineering Department, School of Biomedical Engineering & Imaging Sciences, King’s College London, London, United Kingdom, ³London Collaborative Ultra high field System (LoCUS), London, United Kingdom, ⁴Radiology Department, Great Ormond Street Hospital for Children, London, United Kingdom, ⁵MR Research Collaborations, Siemens Healthcare Limited, Frimley, United Kingdom, ⁶Paris-Saclay University, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-yvette, France

Synopsis

A fast and accurate B1+mapping method is essential for making proper use of a parallel transmit array with high number of coil elements in a clinical setting. The saturation-prepared turbo FLASH method offers this capability and is implemented in the fully automated pre-scan adjustments of the currently only clinical ultra-high magnetic field strength MRI system. However, some parallel transmit methods require an even higher accuracy. This can be achieved by calibrating the fast B1+measurements with a more accurate but longer B1+mapping method.

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