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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