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Multiple-voxel double-quantum lactate-edited spectroscopy using two-dimensional longitudinal Hadamard encoding.

H Lei1, J Peeling

  • 1Department of Chemistry, University of Manitoba, Winnipeg, Canada.

Magnetic Resonance in Medicine
|July 10, 1999
PubMed
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This study presents a novel magnetic resonance imaging (MRI) technique for detecting lactate in the brain. The advanced method provides clear, localized lactate-edited spectra, improving diagnostic capabilities for conditions like stroke.

Area of Science:

  • Biomedical Engineering
  • Neuroimaging
  • Magnetic Resonance Imaging

Background:

  • Lactate accumulation is a key biomarker in various neurological conditions, including focal ischemia.
  • Accurate and localized detection of lactate using magnetic resonance spectroscopy (MRS) is crucial for diagnosis and monitoring.
  • Existing MRS techniques face challenges in spectral editing and spatial localization.

Purpose of the Study:

  • To develop and validate a novel, advanced magnetic resonance imaging (MRI) sequence for multi-voxel lactate-edited spectroscopy.
  • To assess the performance of this sequence in phantoms and in vivo in a rat model of focal brain ischemia.
  • To achieve efficient suppression of background signals for improved lactate detection.

Main Methods:

  • A conventional gradient-selected double-quantum lactate editing sequence was enhanced with fourth-order two-dimensional longitudinal Hadamard encoding.

Related Experiment Videos

  • Slice-selective refocusing was employed to acquire lactate-edited spectra within a 3x3 matrix of voxels.
  • The sequence was tested using phantoms at 9.4 Tesla and in rat brains with focal ischemia at 7.0 Tesla.

    • Main Results:

    • The developed sequence successfully acquired localized lactate-edited spectra with a good signal-to-noise ratio.
    • Efficient suppression of water, lipid, and creatine, choline, and N-acetylaspartate singlet resonances was achieved.
    • The technique demonstrated reliable performance in both phantom studies and in vivo rat brain imaging.

    Conclusions:

    • The novel sequence enables robust, multi-voxel localized lactate-edited magnetic resonance spectroscopy.
    • This technique offers improved sensitivity and specificity for detecting lactate in neurological studies.
    • The method holds promise for non-invasive monitoring of metabolic changes in conditions like ischemic stroke.