Multiple-echo proton spectroscopic imaging using time domain parametric spectral analysis

Andreas P. Kiefer, Varanavasi Govindaraju, Gerald B. Matson, Michael W. Weiner, Andrew A. Maudsley

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

A multiple-echo MR spectroscopic imaging (MRSI) method is presented that enables improved metabolite imaging in the presence of local field inhomogeneities and measurement of transverse relaxation parameters. Short echo spacing is used to maximize signal energy from inhomogeneously line- broadened resonances, and time domain parametric spectral analysis of the entire echo train is used to obtain sufficient spectral resolution from the shortened sampling periods. Optimal sequence parameters for 1H MRSI are determined by computer simulation, and performance is Compared with conventional single-echo acquisition using phantom studies at a field strength of 4.7 T. A preliminary example for use at 1.5 T is also presented using phantom and human brain MRSI studies. This technique is shown to offer improved performance relative to single-echo MRSI for imaging of metabolites with shortened T2*values due to the presence of local field inhomogeneities. Additional advantages are the intrinsic measurement of metabolite T2 values and determination of metabolite integrals without T2 weighting, thereby facilitating quantitative metabolite imaging.

Original languageEnglish (US)
Pages (from-to)528-538
Number of pages11
JournalMagnetic Resonance in Medicine
Volume39
Issue number4
DOIs
StatePublished - Apr 1998

Keywords

  • Brain
  • Parametric spectral analysis
  • Proton spectroscopic imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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