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Abstract #0505

Ultra-high field done ultra-fast:Enhancing Wave-CAIPI using an single-axis insert head gradient

Thomas Roos1,2,3, Edwin Versteeg1, and Jeroen Siero1
1Highfield research group, University Medical Center Utrecht, Utrecht, Netherlands, 2Delft University of Technology, Delft, Netherlands, 3Spinoza Centre for Neuroimaging, Amsterdam, Netherlands


Acceleration techniques like SENSE have enabled significant decreases in scan time, but the $$$G$$$-factor penalty on SNR limits attainable accelerations.
Wave-CAIPI lowers this $$$G$$$-factor by spreading aliasing and taking advantage of the coil sensitivity distributions. A high performance single-axis insert gradient is utilised to increase the attainable wave amplitudes and thereby increasing the effectivity of Wave-CAIPI.

Simulations and 7T phantom & in-vivo acquisitions show significant improvements in $$$G$$$-factor when using Wave-CAIPI, especially when utilizing the higher performance of the insert gradient.
Not only are the $$$G$$$-factors lower but also show increased spreading and lack hard edges, allowing for even faster acquisitions.

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