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Abstract #1451

Variable Density 2D Spiral Excitation with Self Compressed Sensing

Wenwen Jiang 1,2 , Michael Lustig 3 , John Pauly 4 , and Peder E.Z. Larson 5

1 Graduate Group in Bioengineering, University of California, Berkeley, Berkeley, California, United States, 2 University of California, San Francisco, San Francisco, California, United States, 3 Electrical Enigneering and Computer Science, University of California, Berkeley, California, United States, 4 Electrical Enigneering, Stanford University, California, United States, 5 Radiology and Biomedical Imaging, University of California, San Francisco, California, United States

2D spiral excitation pulses are potentially valuable for bolus tracking and reduced FOV imaging. But 2D excitation pulses are usually long, given the FOV and resolution requirements, which results in off-resonance blurring of the spatial profile. Subsampled spiral trajectories could shorten the duration of the pulse but resulting in aliasing sidelobes in the excitation profile. In analogy to the subsampled data acquisition, subsampled excitation profiles can be designed to produce incoherent sidelobes. These can be further reduced by the fact that spin-echoes square the linear excitation dramatically shrinking the sidelobes. With the design of appropriate variable density spiral trajectories, this method will effectively suppress aliasing sidelobes while resulting in shorter excitation pulses.

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