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Navigated single‐voxel proton spectroscopy of the human liver
Author(s) -
Tyszka J. Michael,
Silverman Jeffrey M.
Publication year - 1998
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.1910390102
Subject(s) - laser linewidth , voxel , spectroscopy , nuclear magnetic resonance , diaphragm (acoustics) , spectral line , data acquisition , displacement (psychology) , chemistry , nuclear medicine , physics , computer science , optics , medicine , artificial intelligence , acoustics , vibration , psychology , laser , quantum mechanics , astronomy , psychotherapist , operating system
The addition of a navigator echo acquisition to a 1 H spectroscopy sequence allows retrospective motion correction using acceptance criteria based on measured displacement of the diaphragm. This technique has been applied to the acquisition of short echo‐time 1 H spectroscopy of the liver in seven normal subjects. Navigation correction significantly improved overall spectral quality as measured by the phase variance, linewidth and suppression ratio of the water resonance. The hepatic choline resonance was consistently observed in all navigated spectra. Retrospective navigation makes close to optimal use of data acquisition time and, unlike external respiratory transducers, allows direct measurement of diaphragm displacement. The reconstruction of multiple voxel spectra from a single data set was also demonstrated.