7T Head Coil with Two Independent T/R Channels

For a birdcage T/R head coil at 7T, B1+ field distribution in the head is very non-uniform due to wavelength effects in tissue medium. Using two independent transmit channels to drive the two birdcage modes one can slightly improve B1+ uniformity, but further improvement is needed. Here we propose a modified 7T T/R head coil that maintains the simplicity of two T/R channels but with improved RF shimming capability. Simulations show that this head coil can improve B1+ uniformity in the head considerably more than a conventional birdcage head coil alone with two independent T/R channels.

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