Due to B1+ inhomogeneity, brain images at 7T show important contrast heterogeneity. Many different approaches have been proposed to tackle this problem. The first one was to use High-Dielectric Constant (HDC) pads surrounding the region of interest to enhance locally the RF field. Second solution, called parallel RF transmission (pTx) has been then introduced. It consists of placing several RF transmitters around the subject, instead of a single one on standard MR systems. Taking advantage of RF interferences, it is possible to obtain a much more homogeneous excitation. These additional degrees of freedom provide better control of the magnetization. Third solution is to use metamaterial to interact with the magnetic field and increased the homogeneity. In this presentation, we address these different solutions and give examples of utilisation.