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- W2080206191 abstract "This paper extends the use of principal-component analysis in spectral quantification to the estimation of frequency and phase shifts in a single resonant peak across a series of spectra. The estimated parameters can be used to correct the spectra accordingly, resulting in more accurate peak-area estimation. Further, the removal of the variations in phase and frequency caused by instrumental and experimental fluctuations makes it possible to determine more accurately the remaining variations, which bear biological significance. The procedure is demonstrated on simulated data, a 3D chemical-shift-imaging dataset acquired from a cylinder of inorganic phosphate (Pi), and a set of 73631P NMRin vivospectra taken from a kinetic study of rat muscle energetics. In all cases, the procedure rapidly and automatically identifies the frequency and phase shifts present in the individual spectra. In the kinetic study, the procedure is used twice, first to adjust the phase and frequency of a reference peak (phosphocreatine) and then to determine the individual frequencies of the Pipeak in each of the spectra which further can be used for estimation of pH changes during the experiment." @default.
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- W2080206191 title "NMR Spectral Quantitation by Principal-Component Analysis. II.Determination of Frequency and Phase Shifts" @default.
- W2080206191 doi "https://doi.org/10.1006/jmrb.1996.0106" @default.
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