Calibration of saturation prepared turbo FLASH B1+ maps by actual flip angle imaging at 7T.
Jan Sedlacik1,2,3,4, Raphael Tomi-Tricot1,2,3,5, Tom Wilkinson1,2,3, Pip Bridgen1,2,3, Franck Mauconduit6, Alexis Amadon6, Sharon Giles1,2,3, Joseph V Hajnal1,2,3, and Shaihan J Malik1,2,3
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
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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