A k-space approach to designing multi-dimensional frequency modulated pulses for spatiotemporal MRI
Albert Jang 1,2 , Naoharu Kobayashi 1 , Jianyi Zhang 1,3 , and Michael Garwood 1
Center for Magnetic Resonance Research and
Department of Radiology, University of Minnesota,
Minneapolis, MN, United States,
of Electrical and Computer Engineering, University of
Minnesota, Minneapolis, MN, United States,
Division, Department of Medicine, University of
Minnesota, Minneapolis, MN, United States
Using the low-tip angle approximation based k-space
formulation, a two-dimensional frequency modulated (2D
FM) pulse has been designed for spatiotemporal MRI.
Utilizing a spiral k-trajectory and radial symmetry, the
2D FM pulse selectively excites a cylindrical-shaped
volume by sweeping the resonance region along a spiral
trajectory during the pulse for spatiotemporal encoding.
Furthermore, simulation and experimental results show
that these pulses are able to maintain spatial
selectivity even in the presence of frequency offsets
that arise from chemical shifts and/or B0 inhomogeneity.
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