An interleaved opposing monopole transmit-receive array for 7T brain imaging

At high field, electric dipole antennas are seeing increasing use. When placed close to a relatively high dielectric material such as the body the self-resonant length shortens somewhat, but for 7T head imaging this still comes out to an inconvenient length of 40 cm or more. We describe here a modified monopole antenna where the ground plane is replaced by a strip of conductor. These are arranged in an 8 element array which allows alternating monopoles to be driven from opposing ends of the array, which extends excitation into inferior brain regions while also providing diverse B1 profiles along Z.

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