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Abstract #0921

Delay-Insensitive Variable-Rate Selective Excitation (DIVERSE)

Adam B. Kerr 1 , Kangrong Zhu 1 , Matthew J. Middione 2 , Hua Wu 3 , Robert F. Dougherty 3 , and John M. Pauly 1

1 Electrical Engineering, Stanford University, Stanford, CA, United States, 2 Applied Sciences Laboratory West, GE Healthcare, Menlo Park, CA, United States, 3 Center for Cognitive and Neurobiological Imaging, Stanford University, Stanford, CA, United States

A novel approach for VERSE RF pulse design is presented that reduces sensitivity to system gradient-RF delay. The delay-insensitive VERSE (DIVERSE) method introduces a constraint on the instantaneous product of the RF and gradient magnitudes, thus reducing the impact of a gradient-RF delay on the resultant excitation. DIVERSE pulses show substantial improvement in robust slice-selective excitation compared to minimum-time VERSE pulses for off-isocenter slices. The performance is validated in simulation, experimental slice profile measurements and in application in a diffusion-weighted spin-echo EPI sequence.

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