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. Siero^1,4, 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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