A novel 1H-dipole/31P-birdcage transceiver coil for head imaging at 7T
Ria Forner1, Ingmar Voogt2, Bart Steensma3, Kyungmin Nam3, Mark Gosselink3, Debra Rivera4, William T Clarke5,6, Aidin Alihaghnejad2, Arjan Hendriks3, and Dennis Klomp1
1UMC Utrecht, Utrecht, Netherlands, 2Wavetronica B.V., Utrecht, Netherlands, 3University Medical Center Utrecht, Utrecht, Netherlands, 4Eindhoven University of Technology, Eindhoven, Netherlands, 5Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield, United Kingdom, 6Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
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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