Jin Jin1, Feng Liu1, Adnan Trakic1, Ewald Weber1, Stuart Crozier2
1University of Queensland, St Lucia, Queensland, Australia; 2The University of Queensland, St Lucia, Queensland, Australia
This work investigated the possibility of using a four-channel mechanically rotating RF coil array (RRFCA) to shim the transmit magnetic fields for high-field MRI, while strictly controlling local specific absorption rate (SAR). Since the numerous available degrees of freedom in both the temporal and the spatial domain are exploited, a notably higher excitation accuracy was achieved compared with the stationary eight-channel phased-array coil. The results of this primarily theoretical study also signify that, since only a low channel count is required, the geometry of RRFCA can be optimised more flexibly to improve field penetration and therefore excitation efficiency and performance.