Evaluation of five protocols for quantification of two-dimensional MR spectroscopic images
Five protocols were tested for quantification on in vivo two-dimensional spectroscopic imaging datasets. The datasets are duplo measurements from three individuals. The peaks for N-acetyl aspartate, creatines, and cholines were quantified. The first of the protocols is conventional integration of a...
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Veröffentlicht in: | Magma (New York, N.Y.) N.Y.), 1995-09, Vol.3 (3-4), p.157-161 |
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Sprache: | eng |
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Zusammenfassung: | Five protocols were tested for quantification on in vivo two-dimensional spectroscopic imaging datasets. The datasets are duplo measurements from three individuals. The peaks for N-acetyl aspartate, creatines, and cholines were quantified. The first of the protocols is conventional integration of a selected interval around the peak. The others are various implementations of a Gauss-Newton-based least-squares time-domain fitting algorithm. Fitting a half-echo (free-induction decay curve, FID) to a full echo was compared; this was combined with or without filtering out the water signal using the Lanczos-Hankel singular-value decomposition (LHSVD). It appears that conventional integration yields consistent and accurate results in comparison to the fitting methods. The combination of LHSVD and echo fitting performs equally well; advantages and disadvantages are discussed. The protocols using FID fitting perform poorly with these experimental datasets. |
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ISSN: | 0968-5243 1352-8661 |
DOI: | 10.1007/BF01771701 |