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New strategy for reconstructing partial‐Fourier imaging data in functional MRI
Author(s) -
Zhang Xiaodong,
Yacoub Essa,
Hu Xiaoping
Publication year - 2001
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.1296
Subject(s) - computer science , algorithm , fourier transform , inversion (geology) , iterative reconstruction , phase (matter) , artificial intelligence , computer vision , pattern recognition (psychology) , mathematics , physics , structural basin , mathematical analysis , paleontology , quantum mechanics , biology
Most partial Fourier (PF) approaches use a low‐resolution phase estimate in the reconstruction to account for non‐zero phases of the image. These methods may fail when there are large phase errors, a situation commonly encountered in T * 2 ‐weighted functional MRI (fMRI). To mitigate this problem, a method was developed based on the inversion of a matrix formulated according to a phase map derived from iterative reconstruction. To make this method computationally practical for fMRI, a strategy was introduced such that the matrix inversion is performed only once for each slice in the time series, assuming that the phase map remains constant in the time series. To ensure the temporal phase invariance, physiological noise correction and global phase correction were applied to the data before the reconstruction. This method was demonstrated to be robust and efficient for fMRI. Magn Reson Med 46:1045–1048, 2001. © 2001 Wiley‐Liss, Inc.