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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