A Complementary Images Shimming Method to Mitigate B1 Inhomogeneity for High Field MRI

Guillaume Ferrand¹, Michel Luong¹, Martijn Anton Cloos², Alexis Amadon²

The B1 inhomogeneity is well known to be a source of artifact in high field MRI, and requires the use of multiple-channel parallel transmit coil to reduce the artifact by making either the B1 distribution (static shimming) or the flip angle distribution (dynamic shimming) as uniform as possible. We present here an intermediate and versatile approach to mitigate B1 inhomogeneity based on the principle of complementary images averaging (CIA) while maximizing the signal to noise ratio (S/N).