Daniel Brenner1,
Kaveh Vahedipour1, Tony Stcker1, Jrg Felder1,
Frank Geschewski1, Nadim Jon Shah1, 2
1INM-4,
Forschungszentrum Juelich, Juelich, Germany; 2JARA - Faculty of
Medicine, RWTH Aachen University, Aachen, Germany
UHF MRI at 9.4T suffers from strong RF inhomogeneities. Measurement of the field distribution of a pTX system is crucial for RF shims and pulse design focussing on removing these problems. A robust 3D whole brain calibration protocol, yielding B1 and B0 maps and an approximate brain mask in approximately 5 minutes is demonstrated. The B1 information is corrected for the effect of off-resonances and limited dynamic range.
Keywords