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Minimizing echo and repetition times in magnetic resonance imaging using a double half‐echo k ‐space acquisition and low‐rank reconstruction
Author(s) -
Bydder Mark,
Ali Fadil,
Ghodrati Vahid,
Hu Peng,
Yao Jingwen,
Ellingson Benjamin M.
Publication year - 2021
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.4458
Subject(s) - k space , echo (communications protocol) , sampling (signal processing) , nuclear magnetic resonance , fourier transform , physics , echo time , spin echo , pulse sequence , magnetic resonance imaging , precession , computer science , algorithm , optics , medicine , computer network , radiology , quantum mechanics , astronomy , detector
Sampling k ‐space asymmetrically (ie, partial Fourier sampling) in the readout direction is a common way to reduce the echo time (TE) during magnetic resonance image acquisitions. This technique requires overlap around the center of k ‐space to provide a calibration region for reconstruction, which limits the minimum fractional echo to ~60% before artifacts are observed. The present study describes a method for reconstructing images from exact half echoes using two separate acquisitions with reversed readout polarity, effectively providing a full line of k ‐space without additional data around central k ‐space. This approach can benefit sequences or applications that prioritize short TE, short inter‐echo spacing or short repetition time. An example of the latter is demonstrated to reduce banding artifacts in balanced steady‐state free precession.