Improving B 1 + Uniformity Using Segmented Dielectric Pads

This study presents a novel method of improving dielectric shimming. In contrast to conventional approach where large pads are generally used, narrow segmented pads are used in the current study. Additionally, the combination of permittivity values for all segments is optimised. The simulation results show that, for 7T head imaging, using eight narrow pads with optimised permittivity distribution constraints the displacement currents to the longitudinal direction, to most effectively produce transmit magnetic field. Furthermore, the uniformity of the transmit magnetic field has been significantly improved. By increasing the degrees-of-freedom in regulating the displacement current distribution, the proposed approach provides a new perspective in dielectric shimming.

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