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Abstract #0563

Towards 8ch multi transmit with high power ultrasonic spirals and 72ch receive setup for ultimate spatial encoding at 7T

Dimitri Welting1, Edwin Versteeg1, Ingmar Voogt2, Joost van Straalen3, Martijn Heintges3, Marco Rietveld3, Jeroen C.W. Siero1,4, and Dennis W.J. Klomp1
1Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Wavetronica, Utrecht, Netherlands, 3Prodive Technologies, Son, Netherlands, 4Spinoza Centre for Neuroimaging Amsterdam, Amsterdam, Netherlands

Here we propose a setup to boost spatiotemporal encoding for fMRI in the human brain using high dense receiver arrays (72ch) and fast gradients (6000T/m/s). Moreover, we demonstrate that the operation frequency of a high-end gradient amplifier can be increased to ultrasonic frequencies so to avoid unpleasant acoustic noise. By using this amplifier with 8 transceivers, 64 receivers and a 2-axis cooled gradient coil, a light weight setup is constructed for operation in a 7 Tesla MRI system for fMRI experiments in the human brain.

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