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Abstract #4328

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

1 Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, 2 Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, United States, 3 Cardiovascular 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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