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Theory and application of static field inhomogeneity effects in gradient‐echo imaging
Author(s) -
Reichenbach Jürgen R.,
Venkatesan Ramesh,
Yablonskiy Dmitriy A.,
Thompson Michael R.,
Lai Song,
Haacke E. Mark
Publication year - 1997
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880070203
Subject(s) - dephasing , gradient echo , distortion (music) , echo (communications protocol) , physics , spin echo , nuclear magnetic resonance , field (mathematics) , signal (programming language) , computer science , magnetic resonance imaging , mathematics , condensed matter physics , radiology , medicine , amplifier , computer network , optoelectronics , cmos , pure mathematics , programming language
The influence of local static magnetic field inhomogeneities on gradient‐echo imaging is discussed and the underlying theoretical aspects are reviewed. A high‐resolution approach is suggested to suppress image distortion and restore signal loss due to spin dephasing. Acquisition of three‐dimensional data sets not only overcomes part of the limitations associated with gradient echoes but also makes it possible to extract local information about the strength or direction of background gradients and relative susceptibility changes between different tissues. Applications of the suggested approach in the human brain for anatomical imaging as well as for extraction of physical and physiological parameters are presented and discussed.