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Zigzag sampling for improved parallel imaging
Author(s) -
Breuer Felix A.,
Moriguchi Hisamoto,
Seiberlich Nicole,
Blaimer Martin,
Jakob Peter M.,
Duerk Jeffrey L.,
Griswold Mark A.
Publication year - 2008
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21643
Subject(s) - zigzag , aliasing , sensitivity (control systems) , encoding (memory) , computer science , sampling (signal processing) , phase (matter) , cartesian coordinate system , trajectory , electromagnetic coil , dimension (graph theory) , physics , computer vision , artificial intelligence , optics , algorithm , mathematics , electronic engineering , geometry , filter (signal processing) , quantum mechanics , astronomy , undersampling , pure mathematics , engineering
Conventional Cartesian parallel MRI methods are limited to the sensitivity variations provided by the underlying receiver coil array in the dimension in which the data reduction is carried out, namely, the phase‐encoding directions. However, in this work an acquisition strategy is presented that takes advantage of sensitivity variations in the readout direction, thus improving the parallel imaging reconstruction process. This is achieved by employing rapidly oscillating phase‐encoding gradients during the actual readout. The benefit of this approach is demonstrated in vivo using various zigzag‐shaped gradient trajectory designs. It is shown that zigzag type sampling, in analogy to CAIPIRINHA, modifies the appearance of aliasing in 2D and 3D imaging, thereby utilizing additional sensitivity variations in the readout direction directly resulting in improved parallel imaging reconstruction performance. Magn Reson Med 60:474–478, 2008. © 2008 Wiley‐Liss, Inc.