High B1 Efficiency with Uniform Image Contrast in 3D FFE & TSE at 7T.

Irene Maria Louise van Kalleveen¹, Vincent O. Boer¹, Peter Luijten¹, Dennis W.J. Klomp¹

In high field clinical MRI the B₁ field is limited and inhomogeneous, while RF power deposition is high. Surface coils can improve the B₁ efficiency, however the B₁ field becomes even more inhomogeneous. As the inhomogeneity is mainly dominant in one dimensional, we designed a 1D compensating RF pulse derived from a B₁ map. In combination with slab selective gradients the RF pulse will provide a uniform flip angle as demonstrated by 3D FFE and 3D TSE in the human breast.