Sensitivity and localization enhancement in multinuclear in vivo NMR spectroscopy by outer volume presaturation.

Publication Type	Academic Article
Authors	Shungu D, Glickson J
Journal	Magn Reson Med
Volume	30
Issue	6
Pagination	661-71
Date Published	12/01/1993
ISSN	0740-3194
Keywords	Magnetic Resonance Spectroscopy
Abstract	Sampling of the entire brain tissue in 1H NMR metabolic studies is complicated by the presence of intense pericranial lipid and tissue water resonances, which can obscure metabolite resonances. This study extends the concept of localization by outer volume suppression (OVS) to achieve fully conformal in vivo localization, sampling at least 95% of rat brain with complete elimination of pericranial lipids. This has permitted acquisition of lipid-free short echo time (7.5 ms), high spatial resolution 2D spectroscopic images exhibiting high sensitivity and information content in relatively short measurement time (68 min). Incorporation of spatially tailored OVS into existing methods (e.g., DRESS, STEAM, PRESS) extends their localization efficiency and performance. Two single spin-echo localization sequences have been described that attain much shorter echo times or achieve better water suppression than PRESS. One of these sequences allows editing and relaxometric studies of J-coupled spins. The methods described are suitable for in vivo localization of most tissues and can be applied with any biologically important nucleus.
DOI	10.1002/mrm.1910300603
PubMed ID	8139447