Active and passive RF shimming approaches have been proposed to diminish the B1+ inhomogeneities commonly found in a birdcage coil at 7T. In a previous work, we have introduced a meander dipole based on two 3rd-order Hilbert fractals as an alternative solution for passive shimming. In this work we optimized their design using six 2nd-order Hilbert fractals. Simulations and in vivo MRI at 7T using these structures showed strong B1+ enhancement in the area between the two meander dipoles whereas B1+ was reduced in regions below and above the fractal pads.
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