Magnetic resonance imaging (MRI) at field strengths higher than 1.5 Tesla suffers reduced quality due to severe perturbations caused by the inhomogeneity of the RF excitation field in the human body. If quantitative measurements are done, it is essential to correct these inhomogeneities, in order to obtain meaningful results. Several MRI methods exist to map the distribution of the actual flip angle within an investigated slice. The determined flip angle distribution is proportional to the active component of B1 and therefore also called B1-map. All in-vivo B1-mapping techniques suffer major...