A novel coil design with a 31P birdcage and a 1H dipole array is presented for the purpose of fMRS applications. This design allows for free line-of-sight for fMRI and fMRS visual stimulation via mirrors and despite a lower fill-factor performs comparably to a smaller dual-tuned birdcage. The matching of both frequencies is adequate for a range of human head circumferences from 52cm through 57cm. The 31P birdcage performance is not significantly degraded by presence of 1H dipoles when compared to a conventional birdcage dual-tuning strategy with Foster networks.
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