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Two‐point Dixon technique for water‐fat signal decomposition with B 0 inhomogeneity correction
Author(s) -
Coombs Bernard D.,
Szumowski Jerzy,
Coshow William
Publication year - 1997
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.1910380606
Subject(s) - phase (matter) , point (geometry) , relaxation (psychology) , nuclear magnetic resonance , spin echo , signal (programming language) , echo (communications protocol) , physics , magnetic resonance imaging , spin–spin relaxation , image (mathematics) , fast spin echo , mathematics , computer science , artificial intelligence , spin–lattice relaxation , geometry , radiology , quantum mechanics , programming language , medicine , computer network , nuclear quadrupole resonance , psychology , social psychology
To separate water and lipid resonance signals by phase‐sensitive MRI, a two‐point Dixon (2PD) reconstruction is presented in which phase‐unwrapping is used to obtain an inhomogeneity map based on only in‐phase and out‐of‐phase image data. Two relaxation‐weighted images, a “water image” and a “fat image,” representing a two‐resonance peak model of proton density, are output. The method is designed for T 1 ‐ or density‐weighted spin‐echo imaging; a double‐echo scheme is more appropriate for T 2 ‐weighted spin‐echo imaging. The technique is more time‐efficient for clinical fat‐water imaging than 3PD schemes, while still correcting for field inhomogeneity.