Improved spectral quality for 3D MR spectroscopic imaging using a high spatial resolution acquisition strategy

Andreas Ebel, Andrew A. Maudsley

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

Spectral quality in 1H MR spectroscopic imaging (MRSI) of the brain is often significantly degraded in regions subject to local magnetic susceptibility variations, which results in broadened and distorted spectral lineshapes. In this report, a modified acquisition strategy for volumetric echo-planar spectroscopic imaging (3D EPSI) is presented that extends the region of the brain that can be observed. The data are sampled at higher spatial resolution, then corrected for local B0 shifts and reconstructed such that the final spatial resolution matches that of 3D EPSI data acquired with the conventional lower spatial resolution. Comparison of in vivo data obtained at 1.5 T with these two acquisition schemes shows that the high spatial resolution acquisition provides considerable reduction of spectral linewidths in many problematic brain regions, though with a reduction in signal-to-noise ratio by a factor of approximately 1.4 to 1.6 for the matrix sizes used in this study. However, the effect of the increased noise was largely offset by the improved spectral quality, leading to an overall improvement of the metabolite image quality obtained using automated spectral analysis.

Original languageEnglish (US)
Pages (from-to)113-120
Number of pages8
JournalMagnetic Resonance Imaging
Volume21
Issue number2
DOIs
StatePublished - Feb 2003

Keywords

  • Brain
  • In vivo H MR spectroscopic imaging
  • Spatial resolution
  • Spectral analysis

ASJC Scopus subject areas

  • Biophysics
  • Clinical Biochemistry
  • Structural Biology
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Improved spectral quality for 3D MR spectroscopic imaging using a high spatial resolution acquisition strategy'. Together they form a unique fingerprint.

  • Cite this