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Assessment of 3D proton MR echo‐planar spectroscopic imaging using automated spectral analysis
Author(s) -
Ebel Andreas,
Soher Brian J.,
Maudsley Andrew A.
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.1301
Subject(s) - nuclear magnetic resonance , echo planar imaging , echo (communications protocol) , spectral analysis , proton , magnetic resonance imaging , materials science , physics , nuclear medicine , computer science , spectroscopy , radiology , medicine , nuclear physics , quantum mechanics , computer network
For many clinical applications of proton MR spectroscopic imaging (MRSI) of the brain, diagnostic assessment is limited by insufficient coverage provided by single‐ or multislice acquisition methods as well as by the use of volume preselection methods. Additionally, traditional spectral analysis methods may limit the operator to detailed analysis of only a few selected brain regions. It is therefore highly desirable to use a fully 3D approach, combined with spectral analysis procedures that enable automated assessment of 3D metabolite distributions over the whole brain. In this study, a 3D echo‐planar MRSI technique has been implemented without volume preselection to provide sufficient spatial resolution with maximum coverage of the brain. Using MRSI acquisitions in normal subjects at 1.5T and a fully automated spectral analysis procedure, an assessment of the resultant spectral quality and the extent of viable data in human brain was carried out. The analysis found that 69% of brain voxels were obtained with acceptable spectral quality at TE = 135 ms, and 52% at TE = 25 ms. Most of the rejected voxels were located near the sinuses or temporal bones and demonstrated poor B 0 homogeneity and additional regions were affected by stronger lipid contamination at TE = 25 ms. Magn Reson Med 46:1072–1078, 2001. © 2001 Wiley‐Liss, Inc.