Observation of coupled 1H metabolite resonances at long TE

Brian J. Soher, Pradip Pattany, Gerald B. Matson, Andrew A Maudsley

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A PRESS localization 1H MRS acquisition sequence with a Carr-Purcell train of refocusing pulses (CP-PRESS) has been implemented using global refocusing "sandwich" pulses. The CP pulse train minimized the effects of J-coupled dephasing in metabolites with strongly coupled, multiplet resonance groups as demonstrated in both phantom data and in vivo single-voxel spectroscopy in normal volunteers. Metabolites with multiplet resonance patterns were maintained with greater signal to noise and a simpler resonance pattern at long echo times. T2 decay times for metabolites with singlet and multiplet resonances were similar to published values, except for the NAA multiplet at 2.5 ppm, which had a significantly shorter T2 value (147 ms) than that typically reported for the singlet at 2.01 ppm. Metabolite-nulled spectra were acquired in normal volunteers to evaluate the effects of CP-PRESS on baseline signal contributions from residual water, lipids, and macromolecules. The T2 decay times in four baseline regions in data acquired with the CP-PRESS sequence showed longer decays than corresponding regions in metabolite-nulled spectra from a standard PRESS sequence, but were significantly diminished long before the metabolites of interest were gone. The spectral analysis for spectra with longer TE times also showed less variability due the higher metabolite SNR, simpler spectral patterns, and the decreased baseline contributions.

Original languageEnglish
Pages (from-to)1283-1287
Number of pages5
JournalMagnetic Resonance in Medicine
Volume53
Issue number6
DOIs
StatePublished - Jun 1 2005

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Observation
Spectrum Analysis
Healthy Volunteers
Matrix Attachment Regions
Noise
Lipids
Water

Keywords

  • Carr-Purcell
  • In vivo MR spectroscopy
  • J-coupling
  • Parametric spectral analysis
  • Short TE

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Observation of coupled 1H metabolite resonances at long TE. / Soher, Brian J.; Pattany, Pradip; Matson, Gerald B.; Maudsley, Andrew A.

In: Magnetic Resonance in Medicine, Vol. 53, No. 6, 01.06.2005, p. 1283-1287.

Research output: Contribution to journalArticle

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