Multi-slice ultrafast spatiotemporal encoding (SPEN) MRI by new two dimensional excitation pulses

Two-dimensional (2D) excitation pulses are often used for localization in spectroscopic imaging and for in-plane region-of-interest delineation in MRI. Recent research has shown that these RF manipulations can also be based on spatiotemporal encoding (SPEN) principles. SPEN is a spatiotemporal manipulation that has also been used for single-shot ultrafast MRI. Fast volumetric SPEN MRI acquisitions, however, are still challenged. The present work merges the benefits of both 2D SPEN-based excitation and 2D SPEN single-shot acquisitions, demonstrating a multi-slice ultrafast sequence. Experiments testing these ideas were demonstrated on phantom as well as on brain volunteer imaging experiments at 3 T.

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