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Abstract #3539

Feasibility of crossed-dipole antenna to excite a circularly-polarized field for human brain imaging at 7T,  A design study

Özlem Ipek1 and Rolf Gruetter2,3,4

1CIBM-AIT, EPFL, Lausanne, Switzerland, 2LIFMET, EPFL, Lausanne, Switzerland, 3Department of Radiology, University of Lausanne, Lausanne, Switzerland, 4Department of Radiology, University of Geneva, Geneva, Switzerland

The aim of this study was to investigate the crossed-dipole antenna by means of electromagnetic simulations and compare it with the surface quadrature head loop and volume head coils in terms of B1+ efficiency for 7T human brain imaging. The crossed-dipole antenna consists of two dipoles placed in a crossed form mounted upon/in an one-side conductor shielded dielectric. This antenna excites the circularly-polarized field and enhances the transmit efficiency in the occipital lobe in a larger FOV compared to the conventional coils. The comparison of the simulated B1+ maps of the coils showed that it is feasible to build it.

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