Automated spectral analysis I: Formation of a priori information by spectral simulation

A spectral simulation method is described for generating a priori information for use in parametric spectral analysis. The method makes use of GAMMA (S. A. Smith, T. O. Levante, B. H. Meier, R. R. Ernst, J. Magn. Reson., 106A, 75–105, 1994), a programming environment that facilitates simulation of magnetic resonance phenomena. The input parameters consist of the chemical shifts and scalar spin‐coupling constants for the compounds to be analyzed, the acquisition pulse sequence, and the field strength used. The resultant spectral information consists of the relative amplitude, frequency, and phase of all resonances, which are stored in a spectral database. This procedure can be rapidly and conveniently modified to reflect different acquisition parameters and data analysis requirements.

[1]  K. Behar,et al.  Assignment of resonances in the 1H spectrum of rat brain by two‐dimensional shift correlated and j‐resolved NMR spectroscopy , 1991, Magnetic resonance in medicine.

[2]  W M Bovée,et al.  Improved quantification of in vivo1H NMR spectra by optimization of signal acquisition and processing and by incorporation of prior knowledge into the spectral fitting , 1990, Magnetic resonance in medicine.

[3]  Yen-Chung Chang,et al.  N-acetylaspartate as an intrinsic thermometer for 1H NMR of brain slices , 1985 .

[4]  M W Weiner,et al.  Effects of brain membranes on 1H nuclear magnetic resonance signal intensity of ethanol in vitro. , 1997, Alcohol and alcoholism.

[5]  van der Graaf M,et al.  Effect of Cation Binding on the Proton Chemical Shifts and the Spin-Spin Coupling Constant of Citrate , 1996, Journal of magnetic resonance. Series B.

[6]  Truman R. Brown,et al.  A method for automatic quantification of one-dimensional spectra with low signal-to-noise ratio , 1987 .

[7]  C. Raphael Analysis of phosphorus magnetic resonance spectra using hidden markov models , 1994 .

[8]  Alan H. Wilman,et al.  ObservingN-Acetyl Aspartate via Both ItsN-Acetyl and Its Strongly Coupled Aspartate Groups inin VivoProton Magnetic Resonance Spectroscopy , 1996 .

[9]  J Hennig,et al.  Coupling effects in volume selective 1H spectroscopy of major brain metabolites , 1991, Magnetic resonance in medicine.

[10]  G B Matson,et al.  Measurement of chemical shifts and coupling constants for glutamate and glutamine , 1998, Magnetic resonance in medicine.

[11]  O. Lutz,et al.  Localized double-spin-echo proton spectroscopy of weakly coupled homonuclear spin systems , 1992 .

[12]  V. Govindaraju,et al.  Automated spectral analysis III: Application to in Vivo proton MR Spectroscopy and spectroscopic imaging , 1998, Magnetic resonance in medicine.

[13]  S. Provencher Estimation of metabolite concentrations from localized in vivo proton NMR spectra , 1993, Magnetic resonance in medicine.

[14]  J J Neil,et al.  Homonuclear J coupling effects in volume localized NMR spectroscopy: Pitfalls and solutions , 1998, Magnetic resonance in medicine.

[15]  D. van Ormondt,et al.  Retrieval of frequencies, amplitudes, damping factors, and phases from time-domain signals using a linear least-squares procedure , 1985 .

[16]  J. Frahm,et al.  On the identification of cerebral metabolites in localized 1H NMR spectra of human brain In vivo , 1991, NMR in biomedicine.

[17]  B. Meier,et al.  Computer Simulations in Magnetic Resonance. An Object-Oriented Programming Approach , 1994 .

[18]  B J Soher,et al.  Automated spectral analysis II: Application of wavelet shrinkage for characterization of non‐parameterized signals , 1998, Magnetic resonance in medicine.

[19]  P. Narayana,et al.  Automated proton spectroscopic image processing. , 1995, Journal of magnetic resonance. Series B.

[20]  Jung,et al.  Determination of the Chemical-Shift Difference between the Lactate Multiplets and Its pH Dependence , 1996, Journal of magnetic resonance. Series B.

[21]  M W Weiner,et al.  Automated processing for proton spectroscopic imaging using water reference deconvolution , 1994, Magnetic resonance in medicine.