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Application of an RF current mirror for MRI transmit coils

MPS-Authors
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Müller,  Roland
Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Lenich,  Tobias
Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Kirilina,  Evgeniya
Department Neurophysics (Weiskopf), MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Möller,  Harald E.
Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Müller, R., Lenich, T., Kirilina, E., & Möller, H. E. (2019). Application of an RF current mirror for MRI transmit coils. Poster presented at ISMRM 27th Annual Meeting & Exhibition, Montreal, QC, Canada.


Cite as: https://hdl.handle.net/21.11116/0000-0004-C3AE-C
Abstract
Some types of MRI transmit coils (e.g. Helmholtz coils) require equal currents in different coil elements. We present a novel feeding concept based on a passive RF current mirror, which ensures equal currents even if the loading and tuning of individual elements differ. Analytical equations are given for the dimensioning. It is demonstrated by simulations and experiments that the concept is viable, especially for ultra-high field imaging.