Unshielded bent folded?end dipole 9.4 T human head transceiver array decoupled using modified passive dipoles

Purpose To develop an unshielded dipole transceiver array for human head imaging at 9.4 Tesla and to improve decoupling of adjacent elements, a novel design with modified passive antennas was developed, evaluated, tested. Methods The new consisted 8 bent folded-end elements placed in single row surrounding the head. Adjacent RF arrays are usually decoupled by introducing circuits electrically connected elements. These methods difficult use because distant location antennas. A recently developed technique using dipoles is simple does not require any electrical connection. However, common parallel can produce destructive interference field itself. minimize this interference, we perpendicularly active positioned them ends array. We also evaluated effect different on transmit performance. Finally, optimized performance varying length folded portion. Results By rotating 90º moving toward array, minimized acceptable level without compromising efficiency. Conclusion While keeping benefits method, substantially less than design. constructed demonstrated good whole-brain coverage.