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Proton chemical‐shift imaging with magnetically and electrically inhomogeneous objects
Author(s) -
Nozokido Tatsuo,
Yamamoto Etsuji,
Kohno Hideki,
Yamamoto Shinji
Publication year - 1991
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.1910190114
Subject(s) - artifact (error) , nuclear magnetic resonance , magnetic field , proton , magnetic resonance imaging , phase (matter) , electromagnetic field , materials science , physics , computer science , artificial intelligence , radiology , nuclear physics , medicine , quantum mechanics
Proton chemical‐shift imaging with the elimination of three kinds of artifacts caused by main magnetic field inhomogeneities, susceptibility distributions of imaging objects, and the electromagnetic properties of radiofrequency (RF) fields is presented in this paper. In addition, the last of these artifacts, which is dependent upon the conductivity distributions of objects, especially in high‐tesla imaging, is also demonstrated experimentally. The method proposed here enables the reconstruction of artifact‐free water/fat separation images by using simple image data manipulations without the complicated phase‐unwrap process, even with main magnetic field inhomogeneities larger than the chemical‐shift difference between water and fat magnetizations. © 1991 Academic Press, Inc.