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Abstract #1995

Effect of digitization in gradient modulated adiabatic pulses with a spatial offset.

Jan Willem van der Veen1 and Jun Shen1
1Magnetic Resonance Spectroscopy Core, NIH, NIMH, Bethesda, MD, United States

Spectroscopy on high field clinical scanners with limited RF amplitude suffer from large chemical shift artifacts with conventional pulses. Latest developments in adiabatic pulses with modulated gradients like GOIA-WURST pulses offer wide bandwidth at low RF amplitude. The modulated gradient however requires spatial offsets to be added to the phase modulation of the RF pulse. The additional phase offset may cause error due to insufficient digitization of the rapidly changing RF phase. We examined this effect on the voxel profile for two popular pulse parameter sets.

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