A Double-Row Transmit Array with Broadband Sheath-Wave Damping for 7T Human Head Imaging

Goal of the project was to design an eight-element, double-row, transmit RF array coil for imaging of human heads at 7T. Both rows should be tuned independently using the reflected power minimization approach. At high fields, the common mode problem is presenting a source of loss as well as a potential safety issue. This was addressed by a PCB based 3D coil structure. The combination of balanced feeding, balanced feed lines and resistor-bypassed line shield gaps was sufficient to eliminate sheath waves and hand effects. No conventional traps were required. A good longitudinal coverage of B1+ field can be shown.

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