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Absolute quantitation of brain metabolites with respect to heterogeneous tissue compositions in super(1)H-MR spectroscopic volumes
Ist Teil von
Magma (New York, N.Y.), 2012-10, Vol.25 (5), p.321-333
Erscheinungsjahr
2012
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Object: Referencing metabolite intensities to the tissue water intensity is commonly applied to determine metabolite concentrations from in vivo super(1)H-MRS brain data. However, since the water concentration and relaxation properties differ between grey matter, white matter and cerebrospinal fluid (CSF), the volume fractions of these compartments have to be considered in MRS voxels. Materials and methods: The impact of partial volume correction was validated by phantom measurements in voxels containing mixtures of solutions with different NAA and water concentrations as well as by analyzing in vivo super(1)H-MRS brain data acquired with various voxel compositions. Results: Phantom measurements indicated substantial underestimation of NAA concentrations when assuming homogeneously composed voxels, especially for voxels containing solution, which simulated CSF (error: less than or equal to 92%). This bias was substantially reduced by taking into account voxel composition (error: less than or equal to 10%). In the in vivo study, tissue correction reduced the overall variation of quantified metabolites by up to 35% and revealed the expected metabolic differences between various brain tissues. Conclusions: Tissue composition affects extraction of metabolite concentrations and may cause misinterpretations when comparing measurements performed with different voxel sizes. This variation can be reduced by considering the different tissue types by means of combined analysis of spectroscopic and imaging data.
Sprache
Englisch
Identifikatoren
ISSN: 0968-5243
eISSN: 1352-8661
DOI: 10.1007/s10334-012-0305-z
Titel-ID: cdi_proquest_miscellaneous_1113221665
Format
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