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Effects of carrier frequency mismatch on frequency-selective spectral editing

  • Li AnEmail author
  • Maria Ferraris Araneta
  • Christopher Johnson
  • Jun Shen
Research Article
  • 26 Downloads

Abstract

Objectives

This study sought to investigate the effects of carrier frequency mismatch on spectral editing and its correction by frequency matching of basis functions.

Materials and methods

Full density matrix computations and Monte-Carlo simulations based on magnetic resonance spectroscopy (MRS) data collected from five healthy volunteers at 7 T were used to analyze the effects of carrier frequency mismatch on spectral editing. Relative errors in metabolite quantification were calculated with and without frequency matching of basis functions. The algorithm for numerical computation of basis functions was also improved for higher computational efficiency.

Results

We found significant errors without frequency matching of basis functions when carrier frequency mismatch was generally considered negligible. By matching basis functions with the history of frequency deviation, the mean errors in glutamate, glutamine, γ-aminobutyric acid, and glutathione concentrations were reduced from 3.90%, 1.85%, 11.53%, and 3.43% to 0.18%, 0.34%, 0.40%, and 0.51%, respectively.

Conclusion

Matching basis functions to frequency deviation history was necessary even when frequency deviations during frequency-selective spectral editing were fairly small. Basis set frequency matching significantly improved accuracy in the quantification of glutamate, glutamine, γ-aminobutyric acid, and glutathione concentrations.

Keywords

Glutamate Glutamine GABA Glutathione Spectral editing 

Notes

Acknowledgements

This study was supported by the Intramural Research Program of the National Institute of Mental Health, National Institutes of Health (IRP-NIMH-NIH). Ioline Henter (NIMH) provided excellent editorial assistance.

Author contributions

LA: study conception and design, acquisition of data, analysis and interpretation of data, drafting of manuscript; MFA: acquisition of data; CJ: acquisition of data; JS: study conception and design, analysis and interpretation of data, critical revision.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all participants.

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Copyright information

© European Society for Magnetic Resonance in Medicine and Biology (ESMRMB) 2018

Authors and Affiliations

  1. 1.Section on Magnetic Resonance SpectroscopyNational Institute of Mental Health, National Institutes of HealthBethesdaUSA

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