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Lactate discrimination incorporated into echo‐planar spectroscopic imaging
Author(s) -
Bito Yoshitaka,
Ebisu Toshihiko,
Hirata Satoshi,
Takegami Tetsuro,
Yamamoto Yukari,
Tanaka Chuzo,
Naruse Shoji
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.1077
Subject(s) - signal (programming language) , nuclear magnetic resonance , echo time , chemistry , spectral line , homogeneous , planar , echo (communications protocol) , physics , magnetic resonance imaging , computer science , medicine , radiology , astronomy , programming language , computer network , computer graphics (images) , thermodynamics
A technique for discriminating a lactate signal from overlapping lipid signals in 1 H spectroscopic imaging is presented. It is based on J ‐coupling between lactate protons and on the broad spectral bandwidth of lipid signal. Measurement parameters used in the technique are determined so that TE is separated from n / J ( n : a natural number, J : J ‐coupling constant) enough to suppress the lipid signal at the time when the lactate signal is strongest. Data processing is used to calculate the lactate signal intensity from the reconstructed spectra. This technique enables lactate to be discriminated in a single measurement and enables spectra of other metabolites to be acquired simultaneously. However, it necessitates a homogeneous magnetic field, long TE, and supplementary lipid suppression. Discrimination of the lactate signal is demonstrated by applying lactate‐discriminating echo‐planar spectroscopic imaging (EPSI), which combines this discrimination technique with the standard EPSI, to rat focal cerebral ischemia models. Magn Reson Med 45:568–574, 2001. © 2001 Wiley‐Liss, Inc.