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Abstract #0910

Investigations on accelerated imaging at 9.4T with electronically modulated time-varying receive sensitivities

Felix Glang1, Kai Buckenmaier1, Jonas Bause1, Alexander Loktyushin1, Nikolai Avdievich1, and Klaus Scheffler1,2
1High-field Magnetic Resonance Center, Max-Planck Institute for Biological Cybernetics, Tübingen, Germany, 2Department of Biomedical Magnetic Resonance, Eberhard Karls University Tübingen, Tübingen, Germany

In this work, it is assessed how electronically modulated time-varying receive sensitivities can improve parallel imaging reconstruction at 9.4T. The required sensitivity modulation is achieved by introducing variable capacitance diodes (varactors) in the receive loops that can be independently adjusted to modify B1- profiles. A prototype 4 channel receive array was built, and measured and simulated receive profiles were compared. Additionally, simulations were conducted regarding potential for g-factor improvement. It was found that potential improvements strongly depend on the B1- switching patterns during k-space acquisition, where strongest improvements are to be expected from fast B1- modulations.

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